valgrind 查看性能瓶颈

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[root@shanghai c++11]# gcc test3.c
[root@shanghai c++11]# valgrind --tool=callgrind  --separate-threads=yes ./a.out 20

[root@shanghai c++11]# ll
total 88
-rwxr-xr-x 1 root root  8672 Mar 22 18:08 a.out
-rw------- 1 root root 12943 Mar 22 18:00 callgrind.out.19365
-rw------- 1 root root 13407 Mar 22 18:06 callgrind.out.19720


用 qcachegrind074-x64 打开callgrind.out 文件

如下图