Tcmalloc工具定位内存泄漏问题

内存泄漏问题定位

gperftools工具安装

执行如下操作：

git clone https://github.com/gperftools/gperftools.git
注：如果网速较慢，可直接去下载压缩包。
如我下载的地址：https://github.com/gperftools/gperftools/releases/tag/gperftools-2.15
tar -zxvf gperftools-2.15.tar.gz
cd gperftools-2.15/
./configure
编译：
make -j8
安装：
sudo make install

注：查看pprof安装路径
lx@lx-virtual-machine:~/tcmalloc/gperftools-2.15$ ls /usr/local/bin/pprof*
/usr/local/bin/pprof  /usr/local/bin/pprof-symbolize

注：查看tcmalloc库安装路径
lx@lx-virtual-machine:~/tcmalloc/gperftools-2.15$ ls /usr/local/lib/libtcmalloc*
/usr/local/lib/libtcmalloc.a                       /usr/local/lib/libtcmalloc_minimal_debug.a
/usr/local/lib/libtcmalloc_and_profiler.a          /usr/local/lib/libtcmalloc_minimal_debug.la
/usr/local/lib/libtcmalloc_and_profiler.la         /usr/local/lib/libtcmalloc_minimal_debug.so
/usr/local/lib/libtcmalloc_and_profiler.so         /usr/local/lib/libtcmalloc_minimal_debug.so.4
/usr/local/lib/libtcmalloc_and_profiler.so.4       /usr/local/lib/libtcmalloc_minimal_debug.so.4.5.16
/usr/local/lib/libtcmalloc_and_profiler.so.4.6.11  /usr/local/lib/libtcmalloc_minimal.la
/usr/local/lib/libtcmalloc_debug.a                 /usr/local/lib/libtcmalloc_minimal.so
/usr/local/lib/libtcmalloc_debug.la                /usr/local/lib/libtcmalloc_minimal.so.4
/usr/local/lib/libtcmalloc_debug.so                /usr/local/lib/libtcmalloc_minimal.so.4.5.16
/usr/local/lib/libtcmalloc_debug.so.4              /usr/local/lib/libtcmalloc.so
/usr/local/lib/libtcmalloc_debug.so.4.5.16         /usr/local/lib/libtcmalloc.so.4
/usr/local/lib/libtcmalloc.la                      /usr/local/lib/libtcmalloc.so.4.5.16
/usr/local/lib/libtcmalloc_minimal.a

刷新动态库：

sudo ldconfig

pprof命令测试：

pprof

注：如果出现命令选项即正确安装成功
在这里插入图片描述

Tcmalloc工具测试

测试程序如下

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 
 4 void func_malloc(char* ch)
 5 {
 6         ch = (char *)malloc(sizeof(char));
 7         return ;
 8 }
 9 
 10 int main()
 11 {
 12         printf("hello world!\n");
 13 
 14         char* ch = NULL;
 15         func_malloc(ch);
 16         printf("ch-addr:%p\n", &ch);
 17         //free(ch);
 18 
 19         return 0;
 20 }

执行如下操作进行测试：

lx@lx-virtual-machine:~/tcmalloc$ gcc main.c -g
lx@lx-virtual-machine:~/tcmalloc$ 
lx@lx-virtual-machine:~/tcmalloc$ 
lx@lx-virtual-machine:~/tcmalloc$ ./a.out 
hello world!
ch-addr:0x7ffd2f8b1cc0
lx@lx-virtual-machine:~/tcmalloc$ LD_PRELOAD=/usr/local/lib/libtcmalloc.so HEAPCHECK=normal ./a.out 
No live heap object at 0x7fb1c907a890 to ignore
WARNING: Perftools heap leak checker is active -- Performance may suffer
hello world!
ch-addr:0x7ffcab46fd80
Have memory regions w/o callers: might report false leaks
Leak check _main_ detected leaks of 1 bytes in 1 objects
The 1 largest leaks:
*** WARNING: Cannot convert addresses to symbols in output below.
*** Reason: Cannot find 'pprof' (is PPROF_PATH set correctly?)
*** If you cannot fix this, try running pprof directly.
Leak of 1 bytes in 1 objects allocated from:
	@ 556bf2d04750 
	@ 556bf2d0478e 
	@ 7fb1c88b4c87 
	@ 556bf2d0465a 


If the preceding stack traces are not enough to find the leaks, try running THIS shell command:

pprof ./a.out "/tmp/a.out.56397._main_-end.heap" --inuse_objects --lines --heapcheck  --edgefraction=1e-10 --nodefraction=1e-10 --gv

If you are still puzzled about why the leaks are there, try rerunning this program with HEAP_CHECK_TEST_POINTER_ALIGNMENT=1 and/or with HEAP_CHECK_MAX_POINTER_OFFSET=-1
If the leak report occurs in a small fraction of runs, try running with TCMALLOC_MAX_FREE_QUEUE_SIZE of few hundred MB or with TCMALLOC_RECLAIM_MEMORY=false, it might help find leaks more repeatab
Exiting with error code (instead of crashing) because of whole-program memory leaks

lx@lx-virtual-machine:~/tcmalloc$ pprof ./a.out "/tmp/a.out.56397._main_-end.heap" --lines --text --stack
Using local file ./a.out.
Using local file /tmp/a.out.56397._main_-end.heap.
Total: 0.0 MB
Stacks:

1        (0000556bf2d04750) /home/lx/tcmalloc/main.c:6:func_malloc
         (0000556bf2d0478d) /home/lx/tcmalloc/main.c:15:main
         (00007fb1c88b4c86) /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:310:__libc_start_main
         (0000556bf2d04659) ??:0:_start

Leak of 1 bytes in 1 objects allocated from:
	@ 556bf2d04750 unknown
	@ 0000556bf2d0478d main /home/lx/tcmalloc/main.c:15
	@ 00007fb1c88b4c86 __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:310
	@ 0000556bf2d04659 _start ??:0

     0.0 100.0% 100.0%      0.0 100.0% func_malloc /home/lx/tcmalloc/main.c:6
     0.0   0.0% 100.0%      0.0 100.0% __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:310
     0.0   0.0% 100.0%      0.0 100.0% _start ??:0
     0.0   0.0% 100.0%      0.0 100.0% main /home/lx/tcmalloc/main.c:15