转储和分析.NET Core 中的内存泄漏OOM (dotnet dump) - zLulus/My_Note GitHub Wiki

现象：应用程序在运行过程中内存持续上升

分析工具：dotnet-dump

过程： 安装dotnet-dump

dotnet tool install --global dotnet-dump

找到PID（进程ID）
写入转储文件-p|--process-id

dotnet-dump collect [-h|--help] [-p|--process-id] [-n|--name] [--type] [-o|--output] [--diag]
dotnet-dump collect -p 4807

进入分析的可视化UI
dump_path为转储dump文件路径

dotnet-dump analyze <dump_path> [-h|--help] [-c|--command]
dotnet-dump analyze core_20190430_185145

查看托管堆的整体状态

dumpheap -stat

输出结果

Statistics:
              MT    Count    TotalSize Class Name
...
00007f6c1eeefba8      576        59904 System.Reflection.RuntimeMethodInfo
00007f6c1dc021c8     1749        95696 System.SByte[]
00000000008c9db0     3847       116080      Free
00007f6c1e784a18      175       128640 System.Char[]
00007f6c1dbf5510      217       133504 System.Object[]
00007f6c1dc014c0      467       416464 System.Byte[]
00007f6c21625038        6      4063376 testwebapi.Controllers.Customer[]
00007f6c20a67498   200000      4800000 testwebapi.Controllers.Customer
00007f6c1dc00f90   206770     19494060 System.String
Total 428516 objects

找到内存占用大的方法表 (MT)
根据方法表 (MT) 再获得进一步的信息

dumpheap -mt 00007faddaa50f90

输出结果

  Address               MT     Size
...
00007f6ad09421f8 00007faddaa50f90       94
...
00007f6ad0965b20 00007f6c1dc00f90       80
00007f6ad0965c10 00007f6c1dc00f90       80
00007f6ad0965d00 00007f6c1dc00f90       80
00007f6ad0965df0 00007f6c1dc00f90       80
00007f6ad0965ee0 00007f6c1dc00f90       80

Statistics:
              MT    Count    TotalSize Class Name
00007f6c1dc00f90   206770     19494060 System.String
Total 206770 objects

使用gcroot命令，以查看对象的根方式和原因

gcroot -all 00007f6ad09421f8

输出结果

Thread 3f68:
    00007F6795BB58A0 00007F6C1D7D0745 System.Diagnostics.Tracing.CounterGroup.PollForValues() [/_/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/CounterGroup.cs @ 260]
        rbx:  (interior)
            ->  00007F6BDFFFF038 System.Object[]
            ->  00007F69D0033570 testwebapi.Controllers.Processor
            ->  00007F69D0033588 testwebapi.Controllers.CustomerCache
            ->  00007F69D00335A0 System.Collections.Generic.List`1[[testwebapi.Controllers.Customer, DiagnosticScenarios]]
            ->  00007F6C000148A0 testwebapi.Controllers.Customer[]
            ->  00007F6AD0942258 testwebapi.Controllers.Customer
            ->  00007F6AD09421F8 System.String

HandleTable:
    00007F6C98BB15F8 (pinned handle)
    -> 00007F6BDFFFF038 System.Object[]
    -> 00007F69D0033570 testwebapi.Controllers.Processor
    -> 00007F69D0033588 testwebapi.Controllers.CustomerCache
    -> 00007F69D00335A0 System.Collections.Generic.List`1[[testwebapi.Controllers.Customer, DiagnosticScenarios]]
    -> 00007F6C000148A0 testwebapi.Controllers.Customer[]
    -> 00007F6AD0942258 testwebapi.Controllers.Customer
    -> 00007F6AD09421F8 System.String

Found 2 roots.

参考资料

转储收集和分析实用工具 (dotnet-dump)
调试 .NET Core 中的内存泄漏
Debugging .NET Core memory issues (on Linux) with dotnet dump

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