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@Danack
Created April 29, 2015 18:08
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Batch strace
#!/bin/bash
# Prevent strace from abbreviating arguments?
# You want the -s strsize option, which specifies the maximum length of a string to display (the default is 32).
# running siege
# siege -d10 -c50 http://basereality.test
#Before reboot
#[root@vagrant /]# wrk -t12 -c20 -d30s http://basereality.test/
#Running 30s test @ http://basereality.test/
# 12 threads and 20 connections
# Thread Stats Avg Stdev Max +/- Stdev
# Latency 264.55ms 60.96ms 574.54ms 79.09%
# Req/Sec 3.43 0.97 6.00 80.23%
# 1398 requests in 30.02s, 8.29MB read
#Requests/sec: 46.57
#Transfer/sec: 282.85KB
# By contrast, -etrace=!open means to trace every system call except open. In addition, the special values all and none have the obvious meanings.
#-etrace=!open
#-e trace=!write.
# -s strsize
# Specify the maximum string size to print (the default is 32). Note that
# filenames are not considered strings and are always printed in full.
rm -rf trc/*.trc
#this check doesn't work, as the script gives a compile error before it's run.
if [[ ! $BASH ]]
then
echo "This script needs to run in bash, not sh."
exit -1
fi
additional_strace_args="$1"
mkdir trc
MASTER_PID=$(ps auwx | grep php-fpm | grep -v grep | grep 'master process' | cut -d ' ' -f 7)
# ls -l /tmp/foobar | awk '{print $1"\t"$9}'
# This code takes some input, such as this:
# -rw-rw-rw- 1 root root 1 Jul 14 1997 tmpmsg
# and generates output like this:
# -rw-rw-rw- tmpmsg
#shows total of calls
summarise=""
# summarise="-c"
#Jimbo you probably want to start with summarise enabled.
nohup strace -r $summarise -p $MASTER_PID -ff -o ./trc/master.follow.trc >"trc/master.$MASTER_PID.trc" 2>&1 &
while read -r pid;
do
if [[ $pid != $MASTER_PID ]]; then
#shows individual calls
#nohup strace -r -p "$pid" $additional_strace_args >"trc/$pid.trc" 2>&1 &
#shows total of calls
nohup strace -r $summarise -p "$pid" $additional_strace_args >"trc/$pid.summary.trc" 2>&1 &
fi
done < <(pgrep php-fpm)
#This needs bash not SH
read -p "Strace running - press [Enter] to stop"
pkill strace
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