From bd4214107519d127ec6eab3185e2407288c3e8db Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=B0=8F=E4=BA=BA=E9=B1=BC?= <1823748191@qq.com>
Date: Tue, 7 Jan 2025 10:20:59 +0800
Subject: [PATCH] add readseq compare without compaction thread

---
 benchmark_data.md                               | 108 ++++++++++++++++++++++++
 设计文档.assets/image-20250107101406637.png | Bin 0 -> 16393 bytes
 设计文档.md                                 |  15 +++-
 3 files changed, 120 insertions(+), 3 deletions(-)
 create mode 100644 设计文档.assets/image-20250107101406637.png

diff --git a/benchmark_data.md b/benchmark_data.md
index ed39740..44d346d 100644
--- a/benchmark_data.md
+++ b/benchmark_data.md
@@ -1590,3 +1590,111 @@ All steps completed successfully!
 
 
 
+# 有无GC db_bench
+
+原leveldb：
+
+```
+LevelDB:    version 1.23
+Date:       Tue Jan  7 01:32:40 2025
+CPU:        32 * Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz
+CPUCache:   11264 KB
+Keys:       16 bytes each
+Values:     5000 bytes each (2500 bytes after compression)
+Entries:    1000000
+RawSize:    4783.6 MB (estimated)
+FileSize:   2399.4 MB (estimated)
+WARNING: Snappy compression is not enabled
+------------------------------------------------
+fillseq      :      43.561 micros/op;  109.8 MB/s     
+fillsync     :    8360.610 micros/op;    0.6 MB/s (1000 ops)
+fillrandom   :     306.627 micros/op;   15.6 MB/s     
+overwrite    :     423.441 micros/op;   11.3 MB/s     
+readrandom   :      41.489 micros/op; (864322 of 1000000 found)
+readrandom   :      33.352 micros/op; (864083 of 1000000 found)
+readseq      :       1.077 micros/op; 4442.3 MB/s    
+readreverse  :       2.384 micros/op; 2006.2 MB/s    
+compact      : 27672776.000 micros/op;
+readrandom   :      23.430 micros/op; (864105 of 1000000 found)
+readseq      :       1.262 micros/op; 3791.0 MB/s    
+readreverse  :       2.488 micros/op; 1922.6 MB/s    
+fill100K     :     909.619 micros/op;  104.9 MB/s (1000 ops)
+crc32c       :       1.708 micros/op; 2287.5 MB/s (4K per op)
+snappycomp   :    9937.000 micros/op; (snappy failure)
+snappyuncomp :   10061.000 micros/op; (snappy failure)
+zstdcomp     :    6627.000 micros/op; (zstd failure)
+zstduncomp   :    6851.000 micros/op; (zstd failure)
+```
+
+无GC：
+
+```
+LevelDB:    version 1.23
+Date:       Tue Jan  7 01:12:39 2025
+CPU:        32 * Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz
+CPUCache:   11264 KB
+Keys:       16 bytes each
+Values:     5000 bytes each (2500 bytes after compression)
+Entries:    1000000
+RawSize:    4783.6 MB (estimated)
+FileSize:   2399.4 MB (estimated)
+WARNING: Snappy compression is not enabled
+------------------------------------------------
+fillseq      :      15.353 micros/op;  311.6 MB/s     
+fillsync     :    8307.683 micros/op;    0.6 MB/s (1000 ops)
+fillrandom   :      16.065 micros/op;  297.8 MB/s     
+overwrite    :      16.277 micros/op;  293.9 MB/s     
+readrandom   :      13.119 micros/op; (864322 of 1000000 found)
+readrandom   :      12.603 micros/op; (864083 of 1000000 found)
+readunorderseq :       4.414 micros/op; 1083.8 MB/s  
+readseq      :      10.850 micros/op;  440.9 MB/s    
+readreverse  :      10.840 micros/op;  441.3 MB/s    
+compact      :  301143.000 micros/op;
+readrandom   :      11.220 micros/op; (864482 of 1000000 found)
+readunorderseq :       3.934 micros/op; 1216.1 MB/s  
+readseq      :      10.685 micros/op;  447.7 MB/s    
+readreverse  :      10.865 micros/op;  440.3 MB/s    
+fill100K     :     114.789 micros/op;  830.9 MB/s (1000 ops)
+crc32c       :       1.734 micros/op; 2253.3 MB/s (4K per op)
+snappycomp   :    9693.000 micros/op; (snappy failure)
+snappyuncomp :    9252.000 micros/op; (snappy failure)
+zstdcomp     :    9907.000 micros/op; (zstd failure)
+zstduncomp   :    8232.000 micros/op; (zstd failure)
+```
+
+有GC：
+
+```
+LevelDB:    version 1.23
+Date:       Tue Jan  7 01:26:45 2025
+CPU:        32 * Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz
+CPUCache:   11264 KB
+Keys:       16 bytes each
+Values:     5000 bytes each (2500 bytes after compression)
+Entries:    1000000
+RawSize:    4783.6 MB (estimated)
+FileSize:   2399.4 MB (estimated)
+WARNING: Snappy compression is not enabled
+------------------------------------------------
+fillseq      :      15.083 micros/op;  317.2 MB/s     
+fillsync     :    8272.137 micros/op;    0.6 MB/s (1000 ops)
+fillrandom   :      17.520 micros/op;  273.0 MB/s     
+overwrite    :      23.640 micros/op;  202.3 MB/s     
+readrandom   :      18.831 micros/op; (864322 of 1000000 found)
+readrandom   :      12.227 micros/op; (864083 of 1000000 found)
+readunorderseq :       4.124 micros/op; 1159.9 MB/s  
+readseq      :      10.532 micros/op;  454.2 MB/s    
+readreverse  :      10.518 micros/op;  454.8 MB/s    
+compact      :  344150.000 micros/op;
+readrandom   :      18.466 micros/op; (864482 of 1000000 found)
+readunorderseq :       3.753 micros/op; 1274.6 MB/s  
+readseq      :       9.922 micros/op;  482.1 MB/s    
+readreverse  :      10.438 micros/op;  458.3 MB/s    
+fill100K     :     109.456 micros/op;  871.4 MB/s (1000 ops)
+crc32c       :       1.621 micros/op; 2410.0 MB/s (4K per op)
+snappycomp   :   11457.000 micros/op; (snappy failure)
+snappyuncomp :    9203.000 micros/op; (snappy failure)
+zstdcomp     :    6013.000 micros/op; (zstd failure)
+zstduncomp   :    9923.000 micros/op; (zstd failure)
+```
+
diff --git a/设计文档.assets/image-20250107101406637.png b/设计文档.assets/image-20250107101406637.png
new file mode 100644
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diff --git a/设计文档.md b/设计文档.md
index ad92187..f5d1c82 100644
--- a/设计文档.md
+++ b/设计文档.md
@@ -452,6 +452,8 @@ mode==1表示遍历valuelog_map阶段
 
 mode==2表示读完所有数据，InValid了。
 
+小优化：对于大value会复用内存空间，避免每次都free和new一块大空间。经过测试该优化会带来一些性能提升。（不在以下函数而在MyReadValuelog函数中）
+
 ```
 void UnorderedIter::Next() {
   if(mode==0){
@@ -784,7 +786,7 @@ WriteOptions新增：
 
 ### 5.1**单元测试（测试用例）**：
 
-我们写了共十个大测试。
+我们写了共十个大测试。测试的具体内容请看test/test.cpp。
 
 分别为：
 - 写ValueLog完成后未进入WAL日志的崩溃恢复测试（通过查看ValueLog内部可以看到恢复后未完成的数据从ValueLog中删除）
@@ -908,8 +910,16 @@ gc valuelog 33 success and write 12334344 bytes
 
 ##### 随机读
 
+在有compaction的情况下的读性能对比，可以看到我们的读性能更好。
+
 ![image-20250105205822843](设计文档.assets/image-20250105205822843.png)
 
+在无compaction的情况下随机对比：
+
+发现不考虑合并对读取性能影响的情况下，我们的随机读性能仍然更优。
+
+![image-20250107101406637](设计文档.assets/image-20250107101406637.png)
+
 ##### 原生范围查询
 
 ![image-20250105205545925](设计文档.assets/image-20250105205545925.png)
@@ -1053,7 +1063,7 @@ getkeysbyfieldproportion=0.001
 
 ![image-20250105220226773](设计文档.assets/image-20250105220226773.png)
 
-## 6. 正确性分析与性能分析
+## 6. 内存管理分析、正确性分析与性能分析
 
 #### 1.内存管理分析
 
@@ -1172,4 +1182,3 @@ getkeysbyfieldproportion=0.001
 | 各类性能测试数据记录以及分析            | 1月5日   | 徐翔宇        |
 | 完成设计文档                            | 1月5日   | 徐翔宇&谢瑞阳 |
 
-