如何查看mysqld进程的Profiler

作者:吴炳锡 来源:http://www.mysqlsupport.cn/ 联系方式: wubingxi#gmail.com 转载请注:译者和出处,并且不能用于商业用途,违者必究.

在mysqld中运行中有时偶而出有点看不出来原因的问题,想看看MySQLD中在执行什么,可以用下来的脚本查一下profiler

#PMP 
#http://poormansprofiler.org/
#!/bin/bash
nsamples=1
sleeptime=0
pid=$(pidof mysqld)

for x in $(seq 1 $nsamples)
  do
    gdb -ex "set pagination 0" -ex "thread apply all bt" -batch -p $pid
    sleep $sleeptime
  done | \
awk '
  BEGIN { s = ""; } 
  /Thread/ { print s; s = ""; } 
  /^\#/ { if (s != "" ) { s = s "," $4} else { s = $4 } } 
  END { print s }' | \
sort | uniq -c | sort -r -n -k 1,1
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