从valgrind的callgrind输出中过滤对libc的调用

时间:2011-10-13 23:07:19

标签: filter valgrind call-graph

我正在尝试为文档目的生成服务器的调用图。 用于任何类型的分析。

我使用:

生成输出
sudo valgrind --tool=callgrind --dump-instr=yes /opt/ats-trunk/bin/traffic_server

并使用:http://code.google.com/p/jrfonseca/wiki/Gprof2Dot转换为.dot文件,但这包含太多信息,无法用作文档。

我想过滤掉对libc,libstdc ++,libtcl,libhwloc等等库的调用。

n.b。:我一直在努力试图找出无用的库,但这看起来很麻烦且不完整。

非常感谢你提前给出答案。

1 个答案:

答案 0 :(得分:8)

在这里震耳欲聋的沉默之后,实际上在我问的每个地方,我都转向了valgrind-users @ ML。这是主题:

http://sourceforge.net/mailarchive/forum.php?thread_name=e847e3a9-0d10-4c5e-929f-51258ecf9dfc%40iris&forum_name=valgrind-users

Josef的回复非常有帮助,并且在#perl的帮助下我已经整理了一个脚本,帮助我过滤掉我在调用图中不需要的库。

该脚本依赖于告诉callgrind额外详细:

valgrind --tool=callgrind --dump-instr=yes --compress-pos=no \
  --compress-strings=no /opt/ats-trunk/bin/traffic_server

这样它会生成字符串而不是引用数字,这使得它更容易解析:

#!/usr/bin/perl

use Modern::Perl;
require File::Temp;

my $cob = qr{^cob=/(?:usr/)?lib};
my $ob = qr{^ob=/(?:usr/)?lib/};
my $calls = qr{^calls=};

open (my $fh, '<', $ARGV[0]) or die $!;
my $tmp = File::Temp->new(UNLINK => 1);

## Skip all external libraries, as defined by $ob
while (readline $fh) {
    if (/$ob/ ) {
        # skip the entire ob= section we don't need.
        0 while defined($_ = readline $fh) && !/^ob=/;

        # put the last line back, we read too far
        seek($fh, -length($_), 1);
    } else {
        print $tmp $_;
    }
}
close ($fh);

## Skip all calls to external libraries, as defined by $cob
my $tmpname = $tmp->filename;
open ($tmp, '<', $tmpname) or die $!;
while (readline $tmp) {
    if (/$cob/) {

        # skip until we find a line starting with calls=
        # skip that line too
        0 while defined($_ = readline $tmp) && !/$calls/;

        # then we skip until we either hit ^word= or an empty line.
        # In other words: skip all lines that start with 0x
        0 while defined($_ = readline $tmp) && /^0x/;

        # put the last line back, we read too far
        seek($tmp, -length($_), 1);
    }  else {
       print;
    }
}