Awesome
wLua
<img src="https://img.shields.io/github/license/esrrhs/wLua"> <img src="https://img.shields.io/github/languages/top/esrrhs/wLua"> <img src="https://img.shields.io/github/actions/workflow/status/esrrhs/wLua/cmake.yml?branch=master">
wLua是监视Lua虚拟内部状态的工具。
特性
- C++编写，支持Linux平台
- 通过附加到其他进程上，进行监视
- 支持对table rehash冲突检查
- 支持对table get set次数统计
- 支持对gc数据统计
- 支持对string数据统计
编译
- 运行
./build.sh编译，生成libwlua.so - 下载编译hookso，生成
hookso，hookso是注入工具 - 将
./build.sh、hookso放在同级目录即可使用
示例
运行test.lua，因为alloc_id函数不合理，导致全部hash冲突，会导致rehash的时间很长
# lua test.lua
然后运行监视程序，假定PID=1234
# ./start.sh 1234
然后查看当前目录下的wlua_check.log
table rehash 冲突
[2021.3.13,8:30:8]table hash collision max=64 total=64 at @test.lua:17
[2021.3.13,8:30:8]table hash collision max=128 total=128 at @test.lua:17
[2021.3.13,8:30:8]table hash collision max=256 total=256 at @test.lua:17
[2021.3.13,8:30:8]table hash collision max=512 total=512 at @test.lua:17
[2021.3.13,8:30:8]table hash collision max=1024 total=1024 at @test.lua:17
[2021.3.13,8:30:8]table hash collision max=2048 total=2048 at @test.lua:17
[2021.3.13,8:30:8]table hash collision max=4096 total=4096 at @test.lua:17
[2021.3.13,8:30:9]table hash collision max=8192 total=8192 at @test.lua:17
[2021.3.13,8:30:11]table hash collision max=16384 total=16384 at @test.lua:17
max=hashtable里最大的冲突链表长度，total=hashtable总共的元素个数。当max >= 20%*total会告警
table get set次数
[2021.3.24,7:58:8]table get=1023102 set=360613
[2021.3.24,7:59:8]table get=1023766 set=360613
[2021.3.24,8:0:8]table get=1022092 set=360613
[2021.3.24,8:1:8]table get=1022588 set=360613
[2021.3.24,8:2:8]table get=1019782 set=360613
gc数据
[2021.3.24,7:58:8]gc fullgc=0 step=250 singlestep=4700 singlestep-freesize=9942KB marked-obj=83065 new-obj=331237 free-obj=300028
[2021.3.24,7:59:8]gc fullgc=0 step=300 singlestep=5640 singlestep-freesize=11931KB marked-obj=99678 new-obj=331569 free-obj=360034
[2021.3.24,8:0:8]gc fullgc=0 step=250 singlestep=4700 singlestep-freesize=9942KB marked-obj=83065 new-obj=330732 free-obj=300028
[2021.3.24,8:1:8]gc fullgc=0 step=300 singlestep=5640 singlestep-freesize=11931KB marked-obj=99678 new-obj=330982 free-obj=360036
fullgc是全量gc次数，step是单步gc调用次数，singlestep是单次单步gc调用次数，singlestep-freesize是单步gc总共回收的内存大小，marked-obj是标记为黑色（使用中）的对象个数 new-obj是新建的对象个数，free-obj是释放的对象个数
string数据
[2021.3.24,8:38:22]string alloc=951539 cache=22 short=951517 short-reuse=634333 long=0 short-size=1806KB short-reuse-size=0KB long-size=0KB
[2021.3.24,8:39:22]string alloc=1002332 cache=22 short=1002310 short-reuse=668194 long=0 short-size=1957KB short-reuse-size=0KB long-size=0KB
[2021.3.24,8:40:22]string alloc=999446 cache=22 short=999424 short-reuse=666268 long=0 short-size=1982KB short-reuse-size=0KB long-size=0KB
[2021.3.24,8:41:22]string alloc=993905 cache=22 short=993883 short-reuse=662576 long=0 short-size=2264KB short-reuse-size=0KB long-size=0KB
[2021.3.24,8:42:22]string alloc=982166 cache=22 short=982144 short-reuse=654748 long=0 short-size=2237KB short-reuse-size=0KB long-size=0KB
alloc是分配字符串次数，cache是命中缓存次数，short是分配短字符串次数，short-reuse是命中短字符次数，long是分配长字符串次数，short-size、short-reuse-size、long-size分别是对应的字符串长度。 注意这里short-reuse很大但是short-reuse-size为0，说明有很多分配空字符串的行为