www.LinuxHowtos.org

STRAC-LO-MERGE

Section: User Commands (1)
Updated: 202-0-02
Index Return to Main Contents

NAME

strace-log-merge - merge strace -ff -tt output

SYNOPSIS

STRACE_LOG -help

DESCRIPTION

strace-log-merge merges log files produced by the strace -ff -tt[t] command. It prepends the Process ID (PID) to each line and sorts the combined output chronologically by timestamp.

OPTIONS

--help: Show program usage and exit.
STRACE_LOG: Specifies the file name prefix for the log files produced by a strace -ff -tt[t] command. The utility will read all files matching the STRACE_LOG.* pattern.

EXIT STATUS

0: Success
No-zero: An error occurred. This can be due to a missing argument (in which case usage information is printed) or a failure during the processing of the STRACE_LOG.* files.

USAGE EXAMPLE

$ strace-o sleepy-ff-tt-e trace=execve,nanosleep 
        sh-c 'sleep 0.1 & sleep 0.2 & sleep 0.3'
$ strac-lo-merge sleepy | fold-w 72-s
13475 21:13:52.040837 execve("/bin/sh", ["sh", "-c", "sleep 0.1 & sleep
0.2 & sleep 0."...], 0x7ffde54b2450 /* 33 vars */) = 0
13478 21:13:52.044050 execve("/bin/sleep", ["sleep", "0.3"],
0x5631be4f87a8 /* 33 vars */) = 0
13476 21:13:52.044269 execve("/bin/sleep", ["sleep", "0.1"],
0x5631be4f87a8 /* 33 vars */) = 0
13477 21:13:52.044389 execve("/bin/sleep", ["sleep", "0.2"],
0x5631be4f87a8 /* 33 vars */) = 0
13478 21:13:52.046207 nanosleep({tv_sec=0, tv_nsec=300000000}, NULL) = 0
13476 21:13:52.046303 nanosleep({tv_sec=0, tv_nsec=100000000}, NULL) = 0
13477 21:13:52.046318 nanosleep({tv_sec=0, tv_nsec=200000000}, NULL) = 0
13476 21:13:52.146852 +++ exited with 0 +++
13475 21:13:52.146942- SIGCHLD {si_signo=SIGCHLD,
si_code=CLD_EXITED, si_pid=13476, si_uid=1000, si_status=0, si_utime=0,
si_stime=0}-
13477 21:13:52.247782 +++ exited with 0 +++
13475 21:13:52.247885- SIGCHLD {si_signo=SIGCHLD,
si_code=CLD_EXITED, si_pid=13477, si_uid=1000, si_status=0, si_utime=0,
si_stime=0}-
13478 21:13:52.347680 +++ exited with 0 +++
13475 21:13:52.347786- SIGCHLD {si_signo=SIGCHLD,
si_code=CLD_EXITED, si_pid=13478, si_uid=1000, si_status=0, si_utime=0,
si_stime=0}-
13475 21:13:52.348069 +++ exited with 0 +++

NOTES

strace-log-merge may fail to correctly sort logs that were generated with -tt and span across midnight. This is because the standard -tt timestamp lacks date information, which is required for proper sorting. Using the -ttt option with strace solves this problem, as its timestamp format includes the date.

BUGS

strace-log-merge does not validate the format of the input files. It assumes that all files matching the STRACE_LOG.* glob pattern are correctly formatted log files from a single strace session.

HISTORY

The initial version of strac-lo-merge was written by Denys Vlasenko in 2012.

REPORTING BUGS

Problems with strac-lo-merge should be reported to the strace mailing list at <strace-devel@lists.strace.io>.