diff --git a/CMakeLists.txt b/CMakeLists.txt
index 07431d6..11472b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
 # set(CMAKE_BUILD_TYPE Debug)
-set(CMAKE_BUILD_TYPE Release)
+# set(CMAKE_BUILD_TYPE Release)
 add_definitions(-DSHOW_PERF=1)
 add_definitions(-DSPDLOG_COMPILED_LIB)
 add_subdirectory(src)
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 97d417d..cfa5b54 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -17,8 +17,9 @@ namespace nsgv {
 extern SortArg gSortArg;
 };
 
-int doSort();
+extern int doSort(); // sort 函数声明
 
+// 获取当前时间戳
 string getCurrentTimeStr() {
     time_t time_val;
     struct tm *at;
@@ -29,9 +30,10 @@ string getCurrentTimeStr() {
     return string(now);
 }
 
+// 入口函数
 int main(int argc, char *argv[]) {
     // init log
-    spdlog::set_default_logger(spdlog::stderr_color_st("fastdup"));
+    spdlog::set_default_logger(spdlog::stderr_color_st("fastsort"));
     spdlog::cfg::load_env_levels();
 
     // init arg parser
@@ -138,12 +140,15 @@ int main(int argc, char *argv[]) {
             program.get("--index-format") == "BAI" ? nsmd::IndexFormat::BAI : nsmd::IndexFormat::CSI;
         nsgv::gSortArg.SORT_COORIDINATE = program.get("--sort-type") == "COORDINATE";
 
+        // 三种排序方式
         std::map<std::string, nsmd::QueryNameType> query_name_args = {
             {"NATURAL,", nsmd::QueryNameType::NATURAL},
             {"ASCII", nsmd::QueryNameType::ASCII},
             {"PICARD", nsmd::QueryNameType::PICARD}};
 
         nsgv::gSortArg.QUERY_NAME_TYPE = query_name_args[program.get("--query-name")];
+
+        // 设置缓存大小
         string maxMemStr = program.get("--mem");
         {
             char* q;
@@ -163,8 +168,25 @@ int main(int argc, char *argv[]) {
         return 1;
     }
 
+/**
+ * sort 流程
+ * 第一阶段（phase-1）：
+ * 1. 读入bam文件header（要注意如果是sam或者管道输入则不需要解压，如果是bam，需要考虑samtools和gatk的压缩方式不同，gatk不会block对齐）
+ * 2. phase-1-stage-1: 读入待解压的数据块，直到填满phase-1-stage-1的buffer，读入数据期间分割压缩的block
+ * 3. phase-1-stage-2: 多线程解压数据块，每个线程解压后放在自己的buf里，乱序解压，线程buf满后，进行线程内的排序
+ * 4. phase-1-stage-3: 线程间进行归并排序，然后压缩写入中间文件，清空线程buf，继续读入下一批数据块，直到文件读完
+ * 第二阶段（phase-2）：
+ * 1. 打开所有中间文件，并关联上解压线程池
+ * 2. phase-2-stage-1：解压中间文件，并进行归并排序，放入buf
+ * 3. phase-2-stage-2：多线程进行压缩，放入buf
+ * 4. phase-2-stage-3：将buf写入最终的bam文件
+ * 5. 要注意计算index并写入index文件
+ */
+
     spdlog::info("fast bam sort start");
+    
     doSort();
+    
     spdlog::info("fast bam sort end");
 
     displayProfiling(nsgv::gSortArg.NUM_THREADS);
diff --git a/src/sort/common_data.h b/src/sort/common_data.h
new file mode 100644
index 0000000..cd22fe5
--- /dev/null
+++ b/src/sort/common_data.h
@@ -0,0 +1,25 @@
+/*
+     Description: 共用的一些宏定义，全局变量等
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/05/23
+*/
+
+#pragma once
+
+#include "sam_io.h"
+#include "sort_args.h"
+
+#define PROGRAM_NAME "FastSort"
+#define BAM_COMPRESS_RATIAO 5 // 大概5倍压缩比，用来粗略估计解压后需要多少内存空间
+
+
+namespace nsgv {
+
+// 全局变量 for bamsort
+extern SortArg gSortArg; // 参数
+extern HeaderBuf gInHdr; // 输入文件的header
+extern bool gIsBigEndian;
+};  // namespace nsgv
\ No newline at end of file
diff --git a/src/sort/compress.cpp b/src/sort/compress.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/sort/compress.h b/src/sort/compress.h
new file mode 100644
index 0000000..bf11f4a
--- /dev/null
+++ b/src/sort/compress.h
@@ -0,0 +1,10 @@
+/*
+     Description: 压缩相关的函数
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/02/08
+*/
+
+#pragma once
\ No newline at end of file
diff --git a/src/sort/decompress.cpp b/src/sort/decompress.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/sort/decompress.h b/src/sort/decompress.h
new file mode 100644
index 0000000..dcf5379
--- /dev/null
+++ b/src/sort/decompress.h
@@ -0,0 +1,10 @@
+/*
+     Description: 解压相关的函数
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/02/08
+*/
+
+#pragma once
\ No newline at end of file
diff --git a/src/sort/global_vars.cpp b/src/sort/global_vars.cpp
new file mode 100644
index 0000000..2bfb8dc
--- /dev/null
+++ b/src/sort/global_vars.cpp
@@ -0,0 +1,5 @@
+#include "global_vars.h"
+
+namespace nsgv {
+    
+};
\ No newline at end of file
diff --git a/src/sort/global_vars.h b/src/sort/global_vars.h
new file mode 100644
index 0000000..3561aec
--- /dev/null
+++ b/src/sort/global_vars.h
@@ -0,0 +1,19 @@
+/*
+     Description: 全局变量
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/02/08
+*/
+
+#pragma once
+
+#include "sort_args.h"
+#include "sam_io.h"
+
+namespace nsgv {
+extern SortArg gSortArg; // 参数
+extern HeaderBuf gInHdr;  // 输入文件的header
+extern bool gIsBigEndian;
+};
\ No newline at end of file
diff --git a/src/sort/phase_1.cpp b/src/sort/phase_1.cpp
new file mode 100644
index 0000000..d4c155e
--- /dev/null
+++ b/src/sort/phase_1.cpp
@@ -0,0 +1,52 @@
+/*
+     Description: 排序第一阶段的并行流水线实现代码
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/05/23
+*/
+
+#include "phase_1.h"
+
+#include <spdlog/spdlog.h>
+
+#include "common_data.h"
+#include "phase_1_read.h"
+#include "phase_1_uncompress.h"
+#include "phase_1_write.h"
+#include "util/profiling.h"
+
+void phase1Pipeline() {
+
+#if 1
+    /* set up*/
+    Phase1PipelineArg phase1Arg;
+    phase1Arg.numThread = nsgv::gSortArg.NUM_THREADS;
+    const size_t kReadBufSize = 1L * 1024 * 1024 * phase1Arg.numThread;  // 平均每线程1M缓冲区，累加起来，用来读入文件（BAM/SAM）（相对解压之后的缓冲区，大小可以忽略）
+
+    phase1Arg.uncompressBufBytes = nsgv::gSortArg.MAX_MEM * 0.9; // 比最大内存参数小点
+    phase1Arg.threadBlocksWrap.Resize(phase1Arg.numThread); // 每个线程的解压block数组初始大小，后续如果不够用会自动扩容
+    phase1Arg.singleThreadMemBytes = kReadBufSize * BAM_COMPRESS_RATIAO;
+    spdlog::info("max mem: {}, uncompress mem: {}, single thread mem: {}", nsgv::gSortArg.MAX_MEM, phase1Arg.uncompressBufBytes, phase1Arg.singleThreadMemBytes);
+    for (int i = 0; i < phase1Arg.READ_BUF_NUM; ++i) {
+        phase1Arg.readData[i].Resize(kReadBufSize);
+    };
+
+    // 根据最大内存参数，计算初始化开辟的空间
+    phase1Arg.uncompressData.Resize(phase1Arg.uncompressBufBytes);
+
+    PROF_G_BEG(mid_all);
+    /* create threads */
+    pthread_t tidArr[2]; // 2-stage pipeline
+    pthread_create(&tidArr[0], NULL, phase1ReadFile, &phase1Arg);
+    pthread_create(&tidArr[1], NULL, phase1Uncompress, &phase1Arg);
+
+    for (int i = 0; i < 2; ++i) pthread_join(tidArr[i], NULL);
+
+    spdlog::info("all bams num: {}", phase1Arg.bamNum);
+
+    PROF_G_END(mid_all);
+
+#endif
+}
\ No newline at end of file
diff --git a/src/sort/phase_1.h b/src/sort/phase_1.h
new file mode 100644
index 0000000..764eb12
--- /dev/null
+++ b/src/sort/phase_1.h
@@ -0,0 +1,115 @@
+/*
+     Description: bam是个外排序过程，整个过程包含两个阶段，这是第一个阶段
+        * 第一阶段（phase-1）：
+        * 1. 读入bam文件header（要注意如果是sam或者管道输入则不需要解压）
+        * 2. phase-1-stage-1: 读入待解压的数据块，直到填满phase-1-stage-1的buffer，读入数据期间分割压缩的block
+        * 3. phase-1-stage-2: 多线程解压数据块，每个线程解压后放在自己的buf里，乱序解压，线程buf满后，进行线程内的排序
+        * 4. phase-1-stage-3: 线程间进行归并排序，然后压缩写入中间文件
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/02/08
+*/
+
+#pragma once
+
+#include <stdint.h>
+
+#include "const_val.h"
+#include "sam_io.h"
+#include "util/yarn.h"
+#include "sort.h"
+
+#define START_IDX(i, nt, nele) ((i) * (nele) / (nt))
+#define STOP_IDX(i, nt, nele) (((i) + 1) * (nele) / (nt))
+
+// 第一阶段用到的数据结构
+// 第一阶段的解压、排序、归并、压缩
+struct UncompressBlocksWrap {
+    vector<ThreadBlockArr> threadBlocks;  // 每个thread一个，用来保存解压后的block数据
+
+    vector<DataBuffer> threadBlockBuf; // 每个线程一个，用来保存解压后的block数据，和上边的threadBlocks重复了，暂时保留，后续优化
+
+    UncompressBlocksWrap() {}
+    UncompressBlocksWrap(int numThread) { Resize(numThread); }
+    UncompressBlocksWrap(int numThread, int vecInitSize) { Resize(numThread, vecInitSize); }
+    void Resize(int numThread) { Resize(numThread, 128); }
+    void Resize(int numThread, int vecInitSize) {
+        threadBlocks.resize(numThread);
+        threadBlockBuf.resize(numThread);
+        for (int i = 0; i < numThread; ++i) { threadBlocks[i].blockArr.reserve(vecInitSize); }
+        for (int i = 0; i < numThread; ++i) {
+            threadBlocks[i].blockArr.reserve(vecInitSize);
+            threadBlockBuf[i].allocMem(vecInitSize * SINGLE_BLOCK_SIZE);  // 每个线程的解压block数组初始大小，后续如果不够用会自动扩容
+        }
+    }
+    void ResetBlockArr() {
+        for (int i = 0; i < threadBlocks.size(); ++i) {
+            threadBlocks[i].clear();
+            threadBlockBuf[i].clear();
+        }
+    }
+
+    uint64_t GetTotalBlockNum() {
+        uint64_t totalBlockNum = 0;
+        for (int i = 0; i < threadBlocks.size(); ++i) {
+            totalBlockNum += threadBlocks[i].curIdx;
+        }
+        return totalBlockNum;
+    }
+
+    uint64_t GetHeapBlockNum() {
+        uint64_t heapBlockNum = 0;
+        for (int i = 0; i < threadBlocks.size(); ++i) {
+            heapBlockNum += threadBlocks[i].blockHeap.size();
+        }
+        return heapBlockNum;
+    }
+};
+
+/* 第一阶段的多线程流水线参数 */
+struct Phase1PipelineArg {
+    static const int READ_BUF_NUM = 2; // 读入的buf数量
+    static const int UNCOMPRESS_BUF_NUM = 1; // 解压的buf数量, 只有一个
+    static const int COMPRESS_BUF_NUM = 1;  // 压缩的buf数量, 只有一个
+    static const int WRITE_BUF_NUM = 2;  // 写入文件buf数量
+
+    // common parameters
+    int numThread = 0; // 线程数
+    uint64_t bamNum = 0; // 解压后的bam数量
+    uint64_t singleThreadMemBytes = 0; // 单线程开辟的内存字节上限
+    uint64_t uncompressBufBytes = 0; // 总的解压缓冲区大小
+    uint64_t startBlockId = 0; // 当前轮次起始block id
+
+    // for read-uncompress-parse
+    uint64_t readOrder = 0; // 读取文件轮次编号，与下边的uncompressOrder对应
+    uint64_t uncompressOrder = 0; // 并行解压gz block, 包含排序（缓冲区满之后排序），以及合并之后的压缩
+
+    volatile int readFinish = 0;
+    yarn::lock_t* readSig;
+    yarn::lock_t* uncompressSig;
+    ReadBuffer readData[READ_BUF_NUM];  // 用来读如数据，双缓冲
+    UncompressBlocksWrap threadBlocksWrap;        // 每个thread一个，用来保存解压后的block数据
+    UncompressBlockBuffer uncompressData;  // 所有线程共用一个，串行往这里添加解压后的block数据
+
+
+    // for merge-compress-write
+    uint64_t compressOrder = 0;  // 排序后压缩，这个和下边的writeOder对应，跟上边的order不相关
+    uint64_t writeOrder = 0; // 串行合并解压后的blocks，并解析每个bam的长度，达到内存阈值后，并行排序
+
+    volatile int compressFinish = 0;
+    yarn::lock_t* compressSig;
+    yarn::lock_t* writeSig;
+
+    Phase1PipelineArg() {
+        readSig = yarn::NEW_LOCK(0);
+        uncompressSig = yarn::NEW_LOCK(0);
+    }
+};
+
+
+
+
+// 排序第一阶段，并行流水线执行程序
+void phase1Pipeline();
\ No newline at end of file
diff --git a/src/sort/phase_1_read.cpp b/src/sort/phase_1_read.cpp
new file mode 100644
index 0000000..937d27a
--- /dev/null
+++ b/src/sort/phase_1_read.cpp
@@ -0,0 +1,111 @@
+/*
+     Description: 第一阶段的读入线程
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/05/25
+*/
+
+#include "phase_1_read.h"
+
+#include <spdlog/spdlog.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "common_data.h"
+#include "const_val.h"
+#include "phase_1.h"
+#include "sam_io.h"
+#include "sort.h"
+#include "util/profiling.h"
+#include "util/yarn.h"
+
+/* 具体执行读取文件操作 */
+/* 将bam文件内容读取到buf，解析buf中的gz block长度信息 */
+static size_t doPhase1ReadFile(Phase1PipelineArg& p, DataBuffer& halfBlock, FILE* fpr) {
+    ReadBuffer& readData = p.readData[p.readOrder % p.READ_BUF_NUM];
+    size_t readState = 0;
+    size_t curReadPos = 0;
+    int blockLen = 0;
+    int maxBlockLen = 0;
+
+    readState = fread(readData.dataBuf, 1, readData.readBufSize, fpr);
+    if (readState == 0) {
+        return 0;
+    }
+
+    readData.startAddrArr.clear(); // 先清空上一次的block起始地址信息，后续重新计算并保存当前buf里每个block的起始地址和长度信息
+
+    /* 处理上一个不完整的block */  // 需要一个额外的空间来保存上一个不完整的block数据，因为readbuffer里的data和block都会用来解析，而且解析之后都会清空。
+    if (halfBlock.readPos > 0) {                        // 上一轮有剩余
+        if (halfBlock.readPos < BLOCK_HEADER_LENGTH) {  // 上一轮剩余数据不满足解析block长度信息
+            memcpy(&halfBlock.data[halfBlock.readPos], readData.dataBuf, BLOCK_HEADER_LENGTH - halfBlock.readPos);
+            halfBlock.curLen = unpackInt16(&halfBlock.data[16]) + 1;  // 更新一下剩余block的真正长度
+            // spdlog::info("last remain, blocklen: {}, last load: {}", halfBlock.curLen, halfBlock.readPos);
+        }
+        memcpy(readData.blockBuf, halfBlock.data, halfBlock.readPos);
+        curReadPos = halfBlock.curLen - halfBlock.readPos;  // curlen保存上一个block的长度，readPos保存上一个block在上一次读取中的长度
+        memcpy(&readData.blockBuf[halfBlock.readPos], readData.dataBuf, curReadPos);  // 将不完整的block剩余数据拷贝到curBlock
+        readData.startAddrArr.push_back(readData.blockBuf);
+    }
+    /* 解析读入buf中的文件数据，计算包含的每个block的长度信息和起始地址 */
+    while (curReadPos + BLOCK_HEADER_LENGTH <= readState) { /* 确保能解析block长度 */
+        blockLen = unpackInt16(&readData.dataBuf[curReadPos + 16]) + 1;
+        if (blockLen > maxBlockLen) {
+            maxBlockLen = blockLen;
+        }
+        if (curReadPos + blockLen <= readState) { /* 完整的block数据在buf里 */
+            readData.startAddrArr.push_back(&readData.dataBuf[curReadPos]);
+            curReadPos += blockLen;
+        } else {
+            break; /* 当前block数据不完整，一部分在还没读入的file数据里 */
+        }
+    }
+    /* 如果buf中包含不完整的block数据，先保存一下，放到下一轮里去处理 */
+    halfBlock.readPos = readState - curReadPos;
+    halfBlock.curLen = blockLen;
+    if (halfBlock.readPos > 0) {
+        memcpy(halfBlock.data, &readData.dataBuf[curReadPos], halfBlock.readPos);  // 将不完整的block拷贝到halfBlock
+    }
+
+    // spdlog::info("block num-1: {}", readData.startAddrArr.size());
+    // spdlog::info("read order: {}, max block len: {}", p.readOrder, maxBlockLen);
+
+    return readState;
+}
+
+/* phase1ReadFile step-1 读取文件线程 */
+void* phase1ReadFile(void* data) {
+    Phase1PipelineArg& p = *(Phase1PipelineArg*)data;
+    /* 1. set up */
+    FILE* fpr = fopen(nsgv::gSortArg.INPUT_FILE.c_str(), "rb");
+    parseSamHeader(fpr, nsgv::gInHdr); // 解析header，后续需要用到header里的信息来解析bam数据
+    size_t fileSize = 0;
+    DataBuffer halfBlock(SINGLE_BLOCK_SIZE);
+
+    /* 2. do the work */
+    while (true) {
+        // self dependency
+        yarn::DEPENDENCY_NOT_TO_BE(p.readSig, p.READ_BUF_NUM);
+
+        PROF_G_BEG(read);
+        size_t readState = doPhase1ReadFile(p, halfBlock, fpr);
+        PROF_G_END(read);
+
+        if (readState == 0) {
+            yarn::SIGNAL_FINISH(p.readSig, p.readFinish);
+            break;
+        }
+
+        // update self status
+        yarn::UPDATE_SIG_ORDER(p.readSig, p.readOrder);
+
+        fileSize += readState;
+    }
+
+    spdlog::info("read file order: {}, file size: {}", p.readOrder, fileSize);
+    /* 3. clean up */
+    fclose(fpr);
+    return nullptr;
+}
\ No newline at end of file
diff --git a/src/sort/phase_1_read.h b/src/sort/phase_1_read.h
new file mode 100644
index 0000000..cb2ebce
--- /dev/null
+++ b/src/sort/phase_1_read.h
@@ -0,0 +1,13 @@
+/*
+     Description: 第一阶段的读入线程
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/05/25
+*/
+
+#pragma once
+
+/* phase1ReadFile step-1 读取文件线程 */
+void* phase1ReadFile(void* data);
\ No newline at end of file
diff --git a/src/sort/phase_1_uncompress.cpp b/src/sort/phase_1_uncompress.cpp
new file mode 100644
index 0000000..a26f7d8
--- /dev/null
+++ b/src/sort/phase_1_uncompress.cpp
@@ -0,0 +1,184 @@
+/*
+     Description: 第一阶段的解压线程
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/05/25
+*/
+
+#include "phase_1_uncompress.h"
+
+#include <klib/kthread.h>
+#include <spdlog/spdlog.h>
+#include <stdint.h>
+#include <zlib.h>
+
+#include "common_data.h"
+#include "const_val.h"
+#include "phase_1.h"
+#include "sam_io.h"
+#include "sort.h"
+#include "util/profiling.h"
+#include "util/yarn.h"
+
+/* 多线程解压 */
+static void mtUncompressBlock(void* data, long idx, int tid) {
+    PROF_T_BEG(mem_copy);
+
+    Phase1PipelineArg& p = *(Phase1PipelineArg*)data;
+    ReadBuffer & readData = p.readData[p.uncompressOrder % p.READ_BUF_NUM];
+
+    auto& blockArr = p.threadBlocksWrap.threadBlocks[tid];
+    auto& blockItem = blockArr.add();
+    uint8_t* block = readData.startAddrArr[idx];
+
+    size_t dlen = SINGLE_BLOCK_SIZE;  // 65535
+    int block_length = unpackInt16(&block[16]) + 1;
+    uint32_t crc = le_to_u32(block + block_length - 8);
+    int ret = bgzfUncompress(blockItem.data, &dlen, (Bytef*)block + BLOCK_HEADER_LENGTH, block_length - BLOCK_HEADER_LENGTH, crc);
+    if (ret != 0) {
+        spdlog::error("uncompress error, block id: {}, len: {}, ret: {}", idx, block_length, ret);
+        exit(0);
+    }
+    blockItem.blockId = idx + p.startBlockId;
+    blockItem.blockLen = dlen;
+    blockArr.blockHeap.push({blockItem.blockId, blockArr.curIdx - 1});  // 解压完成后，将block的id和在block数组里的索引加入堆中，方便后续排序和合并
+
+#if 0
+    // 放入全局缓冲区
+    // spdlog::info("top id: {}, block id: {}", blockArr.blockHeap.top().blockId, p.uncompressData.nextBlockId);
+    while (blockArr.blockHeap.top().blockId == p.uncompressData.nextBlockId) {
+        auto& top = blockArr.blockHeap.top();
+        // auto& topBlock = blockArr.blockArr[top.blockArrIdx];
+        // memcpy(p.uncompressData.dataBuf + p.uncompressData.usedBufSize, topBlock.data, topBlock.blockLen);
+        // p.uncompressData.startAddrArr.push_back(p.uncompressData.dataBuf + p.uncompressData.usedBufSize);
+        // p.uncompressData.usedBufSize += topBlock.blockLen;
+        // p.bamNum += topBlock.bamNum;
+
+        blockArr.blockHeap.pop();
+        p.uncompressData.nextBlockId += 1;
+        p.uncompressData.blockNum += 1;
+    }
+#endif
+
+    PROF_T_END(tid, mem_copy);
+}
+
+// 多线程解压，静态分配任务，此时用idx代替tid，multi-thread uncompress bam blocks
+static void mtUncompressBlockBatch(void* data, long idx, int tid) {
+    PROF_T_BEG(mem_copy);
+
+    Phase1PipelineArg& p = *(Phase1PipelineArg*)data;
+    ReadBuffer& readData = p.readData[p.uncompressOrder % p.READ_BUF_NUM];
+
+    tid = idx; // 静态分配任务，此时用idx代替tid
+    int startIdx = START_IDX(idx, p.numThread, readData.startAddrArr.size());
+    int stopIdx = STOP_IDX(idx, p.numThread, readData.startAddrArr.size());
+
+    auto &blockBuf = p.threadBlocksWrap.threadBlockBuf[tid];
+
+    if (stopIdx - startIdx > blockBuf.maxLen / SINGLE_BLOCK_SIZE) {
+        blockBuf.reAllocMem((stopIdx - startIdx) * SINGLE_BLOCK_SIZE);
+    }
+
+    for (int i = startIdx; i < stopIdx; ++i) {
+        uint8_t* block = readData.startAddrArr[i];
+        size_t dlen = SINGLE_BLOCK_SIZE;  // 65535
+        int block_length = unpackInt16(&block[16]) + 1;
+        uint32_t crc = le_to_u32(block + block_length - 8);
+        int ret = bgzfUncompress(blockBuf.data + blockBuf.curLen, &dlen, (Bytef*)block + BLOCK_HEADER_LENGTH, block_length - BLOCK_HEADER_LENGTH, crc);
+        if (ret != 0) {
+            spdlog::error("uncompress error, block id: {}, len: {}, ret: {}", idx, block_length, ret);
+            exit(0);
+        }
+        blockBuf.curLen += dlen;
+    }
+    PROF_T_END(tid, mem_copy);
+}
+
+static void mtMemCopy(void* data, long idx, int tid) {
+    Phase1PipelineArg& p = *(Phase1PipelineArg*)data;
+    tid = idx; // 静态分配任务，此时用idx代替tid
+    uint64_t offset = 0;
+    for (int i = 0; i < tid; ++i) {
+        offset += p.threadBlocksWrap.threadBlockBuf[i].curLen;
+    }
+    memcpy(p.uncompressData.dataBuf + p.uncompressData.usedBufSize + offset, p.threadBlocksWrap.threadBlockBuf[tid].data,
+           p.threadBlocksWrap.threadBlockBuf[tid].curLen);
+}
+
+/* 将gz block进行解压，并进行线程内排序 */
+static void doPhase1Uncompress(Phase1PipelineArg& p, int finish = 0) {
+    PROF_G_BEG(uncompress);
+    uint64_t blockNum = p.readData[p.uncompressOrder % p.READ_BUF_NUM].startAddrArr.size();
+    // kt_for(p.numThread, mtUncompressBlock, &p, blockNum);
+    kt_for(p.numThread, mtUncompressBlockBatch, &p, p.numThread);
+    // 串行拷贝所有blocks
+    PROF_G_BEG(mem_copy);
+#if 1
+    kt_for(p.numThread, mtMemCopy, &p, p.numThread);
+#else
+    for (int i = 0; i < p.numThread; ++i) {
+        memcpy(p.uncompressData.dataBuf + p.uncompressData.usedBufSize, p.threadBlocksWrap.threadBlockBuf[i].data, p.threadBlocksWrap.threadBlockBuf[i].curLen);
+        // p.uncompressData.startAddrArr.push_back(p.uncompressData.dataBuf + p.uncompressData.usedBufSize);
+        p.uncompressData.usedBufSize += p.threadBlocksWrap.threadBlockBuf[i].curLen;
+    }
+#endif
+
+#if 0
+    for (int i = 0; i < 1; ++i) {
+        auto& blockArr = p.threadBlocksWrap.threadBlocks[i];
+        for (int j = 0; j < blockArr.curIdx; ++j) {
+            auto& blockItem = blockArr.blockArr[j];
+            memcpy(p.uncompressData.dataBuf + p.uncompressData.usedBufSize, blockItem.data, blockItem.blockLen);
+            p.uncompressData.startAddrArr.push_back(p.uncompressData.dataBuf + p.uncompressData.usedBufSize);
+            p.uncompressData.usedBufSize += blockItem.blockLen;
+            p.uncompressData.blockNum += 1;
+        }
+    }
+#endif
+
+    PROF_G_END(mem_copy);
+
+    p.startBlockId += blockNum;
+
+    if (true) { // 缓冲区满了
+        spdlog::info("blocks num: {}, left: {}, uncompressed: {}", p.threadBlocksWrap.GetTotalBlockNum(), p.threadBlocksWrap.GetHeapBlockNum(),
+                     p.uncompressData.blockNum);
+        p.uncompressData.Clear();
+        p.threadBlocksWrap.ResetBlockArr();
+        p.uncompressData.nextBlockId = p.startBlockId;
+        p.uncompressData.blockNum = 0;
+    }
+
+    PROF_G_END(uncompress);
+}
+
+/* phase1Uncompress step-2 解压线程 */
+void* phase1Uncompress(void* data) {
+    Phase1PipelineArg& p = *(Phase1PipelineArg*)data;
+
+    /* 2. do the work */
+    while (true) {
+        // previous dependency
+        yarn::DEPENDENCY_NOT_TO_BE(p.readSig, 0);
+
+        if (p.readFinish) {
+            while (p.uncompressOrder < p.readOrder) {
+                doPhase1Uncompress(p, 1);
+                p.uncompressOrder += 1;
+            }
+            break;
+        }
+
+        doPhase1Uncompress(p);
+
+        // update status
+        yarn::CONSUME_SIGNAL(p.readSig);
+        p.uncompressOrder += 1;
+    }
+
+    spdlog::info("uncompress order: {}", p.uncompressOrder);
+    return nullptr;
+}
\ No newline at end of file
diff --git a/src/sort/phase_1_uncompress.h b/src/sort/phase_1_uncompress.h
new file mode 100644
index 0000000..2e608ef
--- /dev/null
+++ b/src/sort/phase_1_uncompress.h
@@ -0,0 +1,13 @@
+/*
+     Description: 第一阶段的解压线程
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/05/25
+*/
+
+#pragma once
+
+/* phase1Uncompress step-2 解压线程 */
+void* phase1Uncompress(void* data);
\ No newline at end of file
diff --git a/src/sort/phase_1_write.cpp b/src/sort/phase_1_write.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/sort/phase_1_write.h b/src/sort/phase_1_write.h
new file mode 100644
index 0000000..e69de29
diff --git a/src/sort/phase_2.cpp b/src/sort/phase_2.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/sort/phase_2.h b/src/sort/phase_2.h
new file mode 100644
index 0000000..f562f55
--- /dev/null
+++ b/src/sort/phase_2.h
@@ -0,0 +1,15 @@
+/*
+     Description: 排序过程的第二阶段
+        * 第二阶段（phase-2）：
+        * 1. 打开所有中间文件，并关联上解压线程池
+        * 2. phase-2-stage-1：解压中间文件，并进行归并排序，放入buf
+        * 3. phase-2-stage-2：多线程进行压缩，放入buf
+        * 4. phase-2-stage-3：将buf写入最终的bam文件
+        * 5. 要注意计算index并写入index文件
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/02/08
+*/
+
+#pragma once
\ No newline at end of file
diff --git a/src/sort/process_header.cpp b/src/sort/process_header.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/sort/process_header.h b/src/sort/process_header.h
new file mode 100644
index 0000000..ac1a89e
--- /dev/null
+++ b/src/sort/process_header.h
@@ -0,0 +1,10 @@
+/*
+     Description: 处理bam/sam文件的header，可能需要解压
+
+     Copyright : All right reserved by ICT
+
+     Author : Zhang Zhonghai
+     Date : 2026/02/08
+*/
+
+#pragma once
\ No newline at end of file
diff --git a/src/sort/sam_io.h b/src/sort/sam_io.h
index b13c10f..1063a12 100644
--- a/src/sort/sam_io.h
+++ b/src/sort/sam_io.h
@@ -4,6 +4,7 @@
 
 #define INCREASE_SIZE (8L * 1024 * 1024)
 
+// 一般用途的数据缓冲区
 struct DataBuffer {
     uint8_t *data;
     size_t readPos = 0; // 当前读取的位置
@@ -36,6 +37,7 @@ struct DataBuffer {
             data = (uint8_t *)realloc(data, maxLen);
         }
     }
+    void clear() { curLen = 0; readPos = 0; }
 };
 
 struct HeaderBuf {
diff --git a/src/sort/sort.cpp b/src/sort/sort.cpp
index 49754e0..3f5c7ec 100644
--- a/src/sort/sort.cpp
+++ b/src/sort/sort.cpp
@@ -23,6 +23,12 @@
 #include "util/profiling.h"
 #include "util/yarn.h"
 
+#include "process_header.h"
+#include "phase_1.h"
+#include "phase_2.h"
+#include "compress.h"
+#include "decompress.h"
+
 using std::string;
 
 #define BAM_BLOCK_SIZE 16L * 1024 * 1024
@@ -49,7 +55,7 @@ struct BamSortData {
 
 /* 将bam文件内容读取到buf，解析buf中的gz block长度信息 */
 static size_t doFirstPipeReadFile(FirstPipeArg &p, DataBuffer &halfBlock, FILE *fpr) {
-    ReadData &readData = p.readData[p.readOrder % p.READ_BUF_NUM];
+    ReadBuffer &readData = p.readData[p.readOrder % p.READ_BUF_NUM];
     size_t readState = 0;
     size_t curReadPos = 0;
     int blockLen = 0;
@@ -60,7 +66,7 @@ static size_t doFirstPipeReadFile(FirstPipeArg &p, DataBuffer &halfBlock, FILE *
 
     readData.startAddrArr.clear();
 
-    /* 处理上一个不完整的block */
+    /* 处理上一个不完整的block */ // 需要一个额外的空间来保存上一个不完整的block数据，因为readbuffer里的data和block都会用来解析，而且解析之后都会清空。
     if (halfBlock.readPos > 0) {  // 上一轮有剩余
         if (halfBlock.readPos < BLOCK_HEADER_LENGTH) {  // 上一轮剩余数据不满足解析block长度信息
             memcpy(&halfBlock.data[halfBlock.readPos], readData.dataBuf, BLOCK_HEADER_LENGTH - halfBlock.readPos);
@@ -160,7 +166,7 @@ static int parseBam(uint8_t* addr, bam1_t* b) {
     c->mtid = le_to_u32(x + 20);
     c->mpos = le_to_i32(x + 24);
     c->isize = le_to_i32(x + 28);
-/*
+#if 0
     new_l_data = block_len - 32 + c->l_extranul;
     if (new_l_data > INT_MAX || c->l_qseq < 0 || c->l_qname < 1)
         return -4;
@@ -198,7 +204,7 @@ static int parseBam(uint8_t* addr, bam1_t* b) {
             return -4;
         }
     }
-*/
+#endif
     return 4 + block_len;
 }
 
@@ -207,7 +213,7 @@ static void mtUncompressBlock(void *data, long idx, int tid) {
     PROF_T_BEG(mem_copy);
 
     UncompressData& p = *(UncompressData*)data;
-    ReadData &readData = *p.readDataPtr;
+    ReadBuffer &readData = *p.readDataPtr;
 
     auto &blockItemArr = p.blockItemArr[tid];
     auto &bamItemArr = p.bamItemArr[tid];
@@ -263,8 +269,9 @@ static void mtUncompressBlock(void *data, long idx, int tid) {
         exit(0);
     }
     blockItem.bamNum = bamNum;
+    blockItemArr.bamNum += bamNum;
 
-    // 判断是否超过内存阈值
+    // 判断是否超过内存阈值，只要有一个超过阈值，就转入下一阶段，进行排序和合并，但是也得把这一轮数据解压处理完
     if (blockItemArr.curIdx * SINGLE_BLOCK_SIZE * BLOCK_MEM_FACTOR >= p.father->singleThreadBytes) {
         p.father->uncompressBufFull = 1;
     } else {
@@ -277,7 +284,7 @@ static void mtUncompressBlock(void *data, long idx, int tid) {
 static void mtUncompressBlockBatch(void* data, long idx, int tid) {
     PROF_T_BEG(mem_copy);
     UncompressData& p = *(UncompressData*)data;
-    ReadData& readData = *p.readDataPtr;
+    ReadBuffer& readData = *p.readDataPtr;
 
     int startIdx = START_IDX(idx, nsgv::gSortArg.NUM_THREADS, readData.startAddrArr.size());
     int stopIdx = STOP_IDX(idx, nsgv::gSortArg.NUM_THREADS, readData.startAddrArr.size());
@@ -306,6 +313,7 @@ static void mtUncompressBlockBatch(void* data, long idx, int tid) {
         uint32_t bamLen = 0;
         uint32_t bamNum = 0;
 
+#if 1
         /* 解析每个bam */
         while (nextBamStart + 4 <= blockItem.blockLen) {
             bamItemArr.bamArr.push_back(OneBam());
@@ -332,6 +340,7 @@ static void mtUncompressBlockBatch(void* data, long idx, int tid) {
             spdlog::error("Block content does not contain integer number of bam records!");
             exit(0);
         }
+#endif
         blockItem.bamNum = bamNum;
 
     }
@@ -397,13 +406,17 @@ static void mtCompressBlock(void* data, long idx, int tid) {
     size_t dlen = BGZF_MAX_BLOCK_SIZE;
     // spdlog::info("len: {}", curAddr);
     bgzfCompress(block, &dlen, compressBlock, curAddr, -1);
+    // 先放到自己线程内部的buf里
+
+    // 然后在压缩完成之后，检测当前全局压缩序号，如果当前序号的block在自己线程内，则复制过去
+
 }
 
 /* 将gz block进行解压，并进行线程内排序 */
-static void doFirstPipeUncompress(FirstPipeArg &p) {
+static void doFirstPipeUncompress(FirstPipeArg &p, int finish = 0) {
     // return;
     PROF_G_BEG(uncompress);
-    ReadData &readData = p.readData[p.uncompressOrder % p.READ_BUF_NUM];
+    ReadBuffer &readData = p.readData[p.uncompressOrder % p.READ_BUF_NUM];
     UncompressData &uncompressData = p.uncompressData[p.uncompressOrder % p.UNCOMPRESS_BUF_NUM];
     uncompressData.readDataPtr = &readData;
 
@@ -415,19 +428,19 @@ static void doFirstPipeUncompress(FirstPipeArg &p) {
 
     PROF_G_END(uncompress);
 
-    // 判断是否超过内存阈值
-    if (p.uncompressBufFull == 1) {
+    // 判断是否超过内存阈值，只要有一个超过阈值，就转入下一阶段，进行排序和合并
+    if (p.uncompressBufFull == 1 || finish) {
 
-        spdlog::info("buf full - {}", p.mergOrder);
+        spdlog::info("buf full - {}", p.mergeOrder);
 
         // spdlog::info("max mem: {}, single thread mem: {}", nsgv::gSortArg.MAX_MEM, p.singleThreadBytes);
 
-        // sort
+        // sort，排序的时候应该线程利用率很高，此时不需要跟其他操作如压缩等进行重叠了
         PROF_G_BEG(sort);
         kt_for(p.numThread, mtInThreadSort, &uncompressData, nsgv::gSortArg.NUM_THREADS);
         PROF_G_END(sort);
         // merge
-#if 1
+#if 0
         auto& bamArr = p.sortedBamArr;
         BamHeap<BamGreaterThan> heap;
         heap.Init(&uncompressData.bamItemArr);
@@ -462,19 +475,29 @@ static void doFirstPipeUncompress(FirstPipeArg &p) {
 
         // spdlog::info("pos all: {}", posAll);
 #endif
-        // compress
+        // compress，此时并行压缩的多线程利用率应该很高了
         PROF_G_BEG(compress);
+#if 0
         kt_for(p.numThread, mtCompressBlock, &p, taskArr.size());
+#endif
+
+        for (auto &blockItemArr : uncompressData.blockItemArr) {
+            p.bamNum += blockItemArr.bamNum;
+        }
 
         uncompressData.ResetBlockArr();
         uncompressData.ResetBamArr();
         p.uncompressBufFull = 0;
-        p.mergOrder++;
+        p.mergeOrder++;
         for(auto &buf : p.threadBuf) {
             buf.curLen = 0;
         }
         PROF_G_END(compress);
+
+        // 压缩完之后应该写入中间文件，这个应该可以overlap
     }
+    // 等处理完这些数据之后，进入新一轮的解压和归并排序压缩输出中间文件。
+    
     // auto &bam = uncompressData.bamItemArr[0].bamArr.back();
     // string qname(bam.qnameAddr, bam.qnameLen);
     // spdlog::info("bam name:{}", qname);
@@ -494,7 +517,7 @@ static void *firstPipeUncompress(void *data) {
         if (p.readFinish) {
             while (p.uncompressOrder < p.readOrder) {
                 yarn::DEPENDENCY_NOT_TO_BE(p.uncompressSig, p.UNCOMPRESS_BUF_NUM);
-                doFirstPipeUncompress(p);
+                doFirstPipeUncompress(p, 1);
                 yarn::UPDATE_SIG_ORDER(p.uncompressSig, p.uncompressOrder);
             }
             yarn::SIGNAL_FINISH(p.uncompressSig, p.uncompressFinish);
@@ -513,9 +536,9 @@ static void *firstPipeUncompress(void *data) {
 }
 
 /* 将并行解压的数据放到一起，解析，到容量阈值后，进行排序并输出到中间文件 */
-void doFirstPipeMergeSort(FirstPipeArg &p) {
+void dofirstPipeWrite(FirstPipeArg &p) {
     PROF_G_BEG(sort);
-    UncompressData &uncompressData = p.uncompressData[p.mergeSortOrder % p.UNCOMPRESS_BUF_NUM];
+    UncompressData &uncompressData = p.uncompressData[p.writeOrder % p.UNCOMPRESS_BUF_NUM];
 
     size_t blockNum = 0;
     for (int i = 0; i < p.numThread; ++i) {
@@ -535,32 +558,32 @@ void doFirstPipeMergeSort(FirstPipeArg &p) {
     PROF_G_END(sort);
 }
 
-/* FirstPipe step-3 串行合并解压后的blocks，并解析每个bam的长度，达到内存阈值后，并行排序 */
-static void *firstPipeMergeSort(void *data) {
+/* FirstPipe step-3 串行写入中间文件（已经压缩好） */
+static void *firstPipeWrite(void *data) {
     FirstPipeArg &p = *(FirstPipeArg *)data;
 
     while (true) {
         yarn::DEPENDENCY_NOT_TO_BE(p.uncompressSig, 0);
 
         if (p.uncompressFinish) {
-            spdlog::info("uncompress finish, cur sort order: {}", p.mergeSortOrder);
-            while (p.mergeSortOrder < p.uncompressOrder) {
-                doFirstPipeMergeSort(p);
-                p.mergeSortOrder += 1;
+            spdlog::info("uncompress finish, cur sort order: {}", p.writeOrder);
+            while (p.writeOrder < p.uncompressOrder) {
+                dofirstPipeWrite(p);
+                p.writeOrder += 1;
             }
             /* 需要检测一下buf中是否还有数据，如果还有，则需要进行排序，可以不输出到中间文件，直接进行second-pipe的归并排序 */
             break;
         }
 
-        doFirstPipeMergeSort(p);
+        dofirstPipeWrite(p);
 
-        p.mergeSortOrder += 1;
+        p.writeOrder += 1;
 
         // update status
         yarn::CONSUME_SIGNAL(p.uncompressSig);
     }
 
-    spdlog::info("merge sort order: {}", p.mergeSortOrder);
+    spdlog::info("merge sort order: {}", p.writeOrder);
     return nullptr;
 }
 
@@ -571,7 +594,7 @@ static void bamSortFirstPipe() {
     firstPipeArg.numThread = nsgv::gSortArg.NUM_THREADS;
     firstPipeArg.singleThreadBytes = nsgv::gSortArg.MAX_MEM / firstPipeArg.numThread;
     spdlog::info("max mem: {}, single thread mem: {}", nsgv::gSortArg.MAX_MEM, firstPipeArg.singleThreadBytes);
-    const size_t kReadBufSize = 1L * 1024 * 1024 * firstPipeArg.numThread;
+    const size_t kReadBufSize = 1L * 1024 * 1024 * firstPipeArg.numThread; // 平均每线程1M缓冲区，累加起来，用来读入文件（BAM/SAM）（相对解压之后的缓冲区，大小可以忽略）
     for (int i = 0; i<firstPipeArg.READ_BUF_NUM; ++i) {
         firstPipeArg.readData[i].Resize(kReadBufSize);
     }
@@ -588,9 +611,12 @@ static void bamSortFirstPipe() {
     pthread_t pipeThreadIdArr[3]; // 3-stage pipeline
     pthread_create(&pipeThreadIdArr[0], NULL, firstPipeReadFile, &firstPipeArg);
     pthread_create(&pipeThreadIdArr[1], NULL, firstPipeUncompress, &firstPipeArg);
-    pthread_create(&pipeThreadIdArr[2], NULL, firstPipeMergeSort, &firstPipeArg);
+    pthread_create(&pipeThreadIdArr[2], NULL, firstPipeWrite, &firstPipeArg);
 
     for (int i = 0; i < 3; ++i) pthread_join(pipeThreadIdArr[i], NULL);
+
+    spdlog::info("all bams num: {}", firstPipeArg.bamNum);
+
     PROF_G_END(mid_all);
 }
 
@@ -617,7 +643,7 @@ static void bamSortSerialFirstPipe() {
     while (true) {
         size_t readState = doFirstPipeReadFile(firstPipeArg, halfBlock, fpr);
         doFirstPipeUncompress(firstPipeArg);
-        doFirstPipeMergeSort(firstPipeArg);
+        dofirstPipeWrite(firstPipeArg);
         if (readState == 0) break;
         fileSize += readState;
     }
@@ -632,12 +658,15 @@ static void samSortFirstPipe() {
 }
 
 
-// entry function
+// 排序的入口函数，entry function
 int doSort() {
 
 #if 1
     nsgv::gIsBigEndian = ed_is_big();
-    bamSortFirstPipe();
+    // 第一轮排序，外排到多个中间文件
+    // bamSortFirstPipe();
+
+    phase1Pipeline();
 
     spdlog::info("OneBam size: {}", sizeof(OneBam));
     // bamSortSerialFirstPipe();
@@ -665,7 +694,9 @@ int doSort() {
 
     int max_bam_len = 0;
     bam1_t *bamp = bam_init1();
+    uint64_t bam_num = 0;
     while (sam_read1(inBamFp, inBamHdr, bamp) >= 0) {
+        bam_num++;
         if (max_bam_len < bamp->l_data) max_bam_len = bamp->l_data;
         if (bamp->l_data > 1000) {
             spdlog::info("large record len: {}", bamp->l_data);
@@ -673,6 +704,7 @@ int doSort() {
     }
     sam_close(inBamFp);
     spdlog::info("max record len: {}", max_bam_len);
+    spdlog::info("bam num: {}", bam_num);
 
 #endif
 
diff --git a/src/sort/sort.h b/src/sort/sort.h
index df09542..69a822b 100644
--- a/src/sort/sort.h
+++ b/src/sort/sort.h
@@ -12,22 +12,22 @@
 using std::priority_queue;
 using std::vector;
 
-#define START_IDX(i, nt, nele) ((i) * (nele) / (nt))
-#define STOP_IDX(i, nt, nele) (((i)+1) * (nele) / (nt))
+//#define START_IDX(i, nt, nele) ((i) * (nele) / (nt))
+//#define STOP_IDX(i, nt, nele) (((i)+1) * (nele) / (nt))
 
 /* for step-1 read data from bam file */
-struct ReadData {
+struct ReadBuffer {
     uint8_t *dataBuf = nullptr;
     uint8_t *blockBuf = nullptr; // 用来保存上一轮没能完整读取的block
     int readBufSize = 0; // 读入的buf大小
     vector<uint8_t *> startAddrArr; // 存放每个block的起始地址
-    ReadData() { }
-    ReadData(int readBufSize_) {
+    ReadBuffer() { }
+    ReadBuffer(int readBufSize_) {
         readBufSize = readBufSize_;
         dataBuf = (uint8_t *)malloc(readBufSize);
         blockBuf = (uint8_t *)malloc(SINGLE_BLOCK_SIZE);
     }
-    ~ReadData() {
+    ~ReadBuffer() {
         if (dataBuf) free(dataBuf);
         if (blockBuf) free(blockBuf);
     }
@@ -40,6 +40,46 @@ struct ReadData {
     }
 };
 
+/* 用来串行保存解压后的block数据, 跟ReadBuffer差不多*/
+struct UncompressBlockBuffer {
+    uint8_t *dataBuf = nullptr; // 用来保存解压后的block数据，串行往这里添加解压后的block数据
+    uint8_t *unCompleteBuf = nullptr; // 用来保存上一轮没能完整解析的bam数据（前一部分，需要后续拷贝到dataBuf里）
+    uint64_t dataBufSize = 0; // 存放的解压之后的block的buf大小
+    uint64_t usedBufSize = 0; // 已经使用的buf大小
+    uint64_t usedUnCompleteBufSize = 0; // 已经使用的unCompleteBuf大小
+    int unCompleteBufSize = 0; // unCompleteBuf里数据的字节数，即上一轮不完整的bam的前半部分大小
+    vector<uint8_t *> startAddrArr; // 存放每个bam的起始地址
+    uint64_t nextBlockId = 0; // 下一个需要放入的block id，按照顺序放入dataBuf里
+
+    uint64_t blockNum = 0; // 解压后的block数量
+
+    UncompressBlockBuffer() { }
+    UncompressBlockBuffer(uint64_t dataBufSize_) {
+        dataBufSize = dataBufSize_;
+        dataBuf = (uint8_t *)malloc(dataBufSize);
+        unCompleteBufSize = SINGLE_BLOCK_SIZE;
+        unCompleteBuf = (uint8_t*)malloc(SINGLE_BLOCK_SIZE);
+    }
+    ~UncompressBlockBuffer() {
+        if (dataBuf) free(dataBuf);
+        if (unCompleteBuf) free(unCompleteBuf);
+    }
+    void Resize(uint64_t dataBufSize_) {
+        if (dataBuf) free(dataBuf);
+        if (unCompleteBuf) free(unCompleteBuf);
+        dataBufSize = dataBufSize_;
+        unCompleteBufSize = SINGLE_BLOCK_SIZE;
+        dataBuf = (uint8_t *)malloc(dataBufSize);
+        unCompleteBuf = (uint8_t *)malloc(SINGLE_BLOCK_SIZE);
+    }
+    void Clear() { usedBufSize = 0; usedUnCompleteBufSize = 0; startAddrArr.clear(); }
+};
+
+
+/*  */
+
+
+
 class ThreadBlockArr;
 /* for step-2 parallel uncompress gz blocks，还有缓存满了之后的线程内排序，用来排序的*/
 struct OneBam {
@@ -84,15 +124,30 @@ struct ThreadBamArr {
     void clear() { curIdx = 0; }
 };
 
+// 解压后的一个block数据
 struct OneBlock {
     uint8_t data[SINGLE_BLOCK_SIZE];
     uint32_t blockLen = 0;  // 解压后的数据长度
     uint64_t blockId = 0;   // 按照顺序排列的block ID
     uint64_t bamNum = 0;   // 解压后的bam数量
 };
+
+struct BlockIdIdx {
+    uint64_t blockId = 0;
+    int blockArrIdx = 0;  // 在block数组里的索引
+    // 方法一：重载 operator> 供 std::greater<Task> 使用
+    bool operator>(const BlockIdIdx& other) const {
+        return blockId > other.blockId;  // blockId 小的优先级高（最小堆）
+    }
+};
+// 每个线程一个解压block数组
 struct ThreadBlockArr {
     vector<OneBlock> blockArr;  // 解压后的数据
     int curIdx = 0;             // 当前解压数据对应的vector的索引
+    uint64_t bamNum = 0;        // 解压后的bam数量
+    // 最小堆
+    std::priority_queue<BlockIdIdx, std::vector<BlockIdIdx>, std::greater<BlockIdIdx>> blockHeap;
+
     OneBlock& add() {
         if (curIdx < blockArr.size())
             return blockArr[curIdx++];
@@ -114,7 +169,11 @@ struct ThreadBlockArr {
         }
     }
 
-    void clear() { curIdx = 0; }
+    void clear() {
+        curIdx = 0;
+        bamNum = 0;
+        blockHeap = {};
+    }
 };
 
 class FirstPipeArg;
@@ -124,7 +183,7 @@ struct UncompressData {
     vector<ThreadBlockArr> blockItemArr; // 每个thread一个，用来保存解压后的block数据
     vector<ThreadBamArr> bamItemArr;   // 每个thread一个，用来保存解压后的bam数据
 
-    ReadData *readDataPtr = nullptr; // 读取数据的指针
+    ReadBuffer *readDataPtr = nullptr; // 读取数据的指针
     FirstPipeArg* father = nullptr; // 保存父参数的指针，可能更新一些状态
 
     UncompressData() { }
@@ -138,7 +197,7 @@ struct UncompressData {
         bamItemArr.resize(numThread);
         for (int i = 0; i < numThread; ++i) {
             blockItemArr[i].blockArr.reserve(vecInitSize);
-            bamItemArr[i].bamArr.reserve(vecInitSize * 192);
+            bamItemArr[i].bamArr.reserve(vecInitSize * 192); // 192是每个block平均包含的bam数量，单线程解压一个block的数据，平均会得到192条bam记录，应该作为一个参数或者宏定义
         }
     }
     void ResetBlockArr() {
@@ -305,10 +364,13 @@ struct FirstPipeArg {
     int numThread = 0; // 线程数
     uint64_t singleThreadBytes = 0; // 单线程开辟的内存字节上限
 
+    // for test
+    uint64_t bamNum = 0; // 解压后的bam数量
+
     uint64_t readOrder = 0; // 读取文件
-    uint64_t uncompressOrder = 0; // 并行解压gz block
-    uint64_t mergeSortOrder = 0; // 串行合并解压后的blocks，并解析每个bam的长度，达到内存阈值后，并行排序
-    uint64_t mergOrder = 0; // 用来给中间文件编号
+    uint64_t uncompressOrder = 0; // 并行解压gz block, 包含排序（缓冲区满之后排序），以及合并之后的压缩
+    uint64_t writeOrder = 0; // 串行合并解压后的blocks，并解析每个bam的长度，达到内存阈值后，并行排序
+    uint64_t mergeOrder = 0; // 用来给中间文件编号
 
     volatile int readFinish = 0;
     volatile int uncompressFinish = 0;
@@ -317,8 +379,9 @@ struct FirstPipeArg {
     yarn::lock_t *readSig;
     yarn::lock_t *uncompressSig;
 
-    ReadData readData[READ_BUF_NUM];
-    UncompressData uncompressData[UNCOMPRESS_BUF_NUM];
+    ReadBuffer readData[READ_BUF_NUM]; // 用来读如数据，双缓冲
+    UncompressData uncompressData[UNCOMPRESS_BUF_NUM]; // 每个线程内保留一些自己的数据，比如解压缩的数据
+    UncompressBlockBuffer unCompblockDataBuf; // 所有线程共用一个，串行往这里添加解压后的block数据
     vector<const OneBam*> sortedBamArr;
     vector<ArrayInterval> taskArr;
     vector<DataBuffer> threadBuf;
diff --git a/src/sort/sort_impl.h b/src/sort/sort_impl.h
index c5eb89b..c9da2d6 100644
--- a/src/sort/sort_impl.h
+++ b/src/sort/sort_impl.h
@@ -5,6 +5,8 @@
 
 #include "sort.h"
 
+// 好像不需要用到这些了？
+
 // Struct which contains the sorting key for TemplateCoordinate sort.
 struct TemplateCoordinateKey {
     int tid1;
diff --git a/src/util/profiling.h b/src/util/profiling.h
index 820f305..a0fc35c 100644
--- a/src/util/profiling.h
+++ b/src/util/profiling.h
@@ -29,9 +29,9 @@ extern uint64_t gprof[LIM_GLOBAL_PROF_TYPE];
 #define PROF_T_BEG_AGAIN(time_name) prof_T_tmp_##time_name = realtimeMsec()
 #define PROF_T_END(tid, time_name) tprof[TP_##time_name][tid] += realtimeMsec() - prof_T_tmp_##time_name
 #define PROF_PRINT_BEG(tmp_time) uint64_t tmp_time = realtimeMsec()
-#define PROF_PRINT_END(tmp_time)          \
-    tmp_time = realtimeMsec() - tmp_time; \
-    fprintf(stderr, "time %-15s:     %0.2lfs\n", #tmp_time, tmp_time * 1.0 / proc_freq)
+//#define PROF_PRINT_END(tmp_time)          \
+//    tmp_time = realtimeMsec() - tmp_time; \
+//    fprintf(stderr, "time %-15s:     %0.2lfs\n", #tmp_time, tmp_time * 1.0 / proc_freq)
 #else
 #define PROF_G_BEG(time_name)
 #define PROF_G_BEG_AGAIN(time_name)
@@ -41,7 +41,24 @@ extern uint64_t gprof[LIM_GLOBAL_PROF_TYPE];
 #define PROF_T_END(tid, time_name)
 #endif
 
-
+#ifdef SHOW_PERF
+#define PROF_START(tmp_time) uint64_t prof_tmp_##tmp_time = RealtimeMsec()
+#define PROF_START_AGAIN(tmp_time) prof_tmp_##tmp_time = RealtimeMsec()
+#define PROF_END(result, tmp_time) result += RealtimeMsec() - prof_tmp_##tmp_time
+#define PROF_GP_END(tmp_time) gprof[tmp_time] += RealtimeMsec() - prof_tmp_##tmp_time
+#define PROF_TP_END(tmp_time) tprof[tmp_time][thid] += RealtimeMsec() - prof_tmp_##tmp_time
+#define PROF_PRINT_START(tmp_time) uint64_t tmp_time = RealtimeMsec()
+#define PROF_PRINT_END(tmp_time)          \
+    tmp_time = RealtimeMsec() - tmp_time; \
+    fprintf(stderr, "time %-15s:     %0.2lfs\n", #tmp_time, tmp_time * 1.0 / proc_freq)
+#else
+#define PROF_START(tmp_time)
+#define PROF_END(result, tmp_time)
+#define PROF_GP_END(tmp_time)
+#define PROF_TP_END(tmp_time)
+#define PROF_PRINT_START(tmp_time)
+#define PROF_PRINT_END(tmp_time)
+#endif
 
 // GLOBAL
 enum { GP_0 = 0, GP_1, GP_2, GP_3, GP_4, GP_5, GP_6, GP_7, GP_8, GP_9, GP_10 };