valgrind，分析计时器已过期? [英] valgrind, profiling timer expired?

问题描述

我尝试使用 valgrind 分析一个简单的 c prog:

I try to profile a simple c prog using valgrind:

[zsun@nel6005001 ~]$ valgrind --tool=memcheck ./fl.out
==2238== Memcheck，内存错误检测器
==2238== 版权所有 (C) 2002-2009 和 GNU GPL，由 Julian Seward 等人
==2238== 使用 Valgrind-3.5.0 和 LibVEX；使用 -h 重新运行以获取版权信息
==2238== 命令:./fl.out
==2238==
==2238==
==2238== 堆摘要:
==2238== 在退出时使用:1 个块中的 1,168 个字节
==2238== 总堆使用量:1 次分配，0 次释放，已分配 1,168 字节
==2238==
==2238== 泄漏摘要:
==2238== 肯定丢失了:0 个块中的 0 个字节
==2238== 间接丢失:0 个块中的 0 个字节
==2238== 可能丢失:0 个块中的 0 个字节
==2238== 仍然可以访问:1 个块中有 1,168 个字节
==2238== 被抑制:0 个块中的 0 个字节
==2238== 重新运行 --leak-check=full 以查看泄漏内存的详细信息
==2238==
==2238== 对于检测到和抑制的错误的计数，重新运行: -v
==2238== 错误摘要:0 个上下文中的 0 个错误(被抑制:8 个中的 12 个)
分析计时器已过期

[zsun@nel6005001 ~]$ valgrind --tool=memcheck ./fl.out
==2238== Memcheck, a memory error detector
==2238== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==2238== Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyright info
==2238== Command: ./fl.out
==2238==
==2238==
==2238== HEAP SUMMARY:
==2238== in use at exit: 1,168 bytes in 1 blocks
==2238== total heap usage: 1 allocs, 0 frees, 1,168 bytes allocated
==2238==
==2238== LEAK SUMMARY:
==2238== definitely lost: 0 bytes in 0 blocks
==2238== indirectly lost: 0 bytes in 0 blocks
==2238== possibly lost: 0 bytes in 0 blocks
==2238== still reachable: 1,168 bytes in 1 blocks
==2238== suppressed: 0 bytes in 0 blocks
==2238== Rerun with --leak-check=full to see details of leaked memory
==2238==
==2238== For counts of detected and suppressed errors, rerun with: -v
==2238== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 12 from 8)
Profiling timer expired

我试图分析的 c 代码如下:

The c code I am trying to profile is the following:

void forloop(void){
    int fac=1;
    int count=5;
    int i,k;

    for (i = 1; i <= count; i++){
        for(k=1;k<=count;k++){
            fac = fac * i;
        }
    }
}

出现Profiling timer expired"，是什么意思?如何解决这个问题呢?谢谢！

"Profiling timer expired" shows up, what does it mean? How to solve this problem? thx!

推荐答案

问题是您在使用 -pg 编译的程序上使用 valgrind.您不能同时使用 valgrind 和 gprof.如果您使用的是 Linux 并且需要在 valgrind 下分析程序的实际仿真，则 valgrind 手册建议使用 OProfile.

The problem is that you are using valgrind on a program compiled with -pg. You cannot use valgrind and gprof together. The valgrind manual suggests using OProfile if you are on Linux and need to profile the actual emulation of the program under valgrind.

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