02-20-2013
Well, strace does add overhead, so you might look at the strace to see what is exec'd that you could test ps for. It is probably on your terminal even if disconnected from your shell.
If any of the files is per-run and is closed at the end, you might be able to make a named pipe the target and track its life by the cat of the output out of the named pipe. Strace can tell you what is being closed at the end, too.
Calling fuser on files can find user processes, but it is a bit slow.
Last edited by DGPickett; 02-20-2013 at 04:50 PM..
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LEARN ABOUT FREEBSD
strace-log-merge
STRACE-LOG-MERGE(1) General Commands Manual STRACE-LOG-MERGE(1)
NAME
strace-log-merge - merge strace -ff -tt output
SYNOPSIS
strace-log-merge STRACE_LOG
strace-log-merge --help
DESCRIPTION
strace-log-merge merges the output of strace -ff -tt[t] command, prepending PID to each line and sorting the result using time stamp as a
key.
OPTIONS
--help Show program usage and exit.
STRACE_LOG
Output file name prefix of files produced by a strace -ff -tt[t] command.
EXIT STATUS
0 Success
Non-zero
Error occurred: either no argument specified (in that case a usage is printed), or something went wrong during the processing of
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'
$ strace-log-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 does not work well with strace logs generated by strace -tt invocation that pass midnight, as those lack the information
required for the proper sorting. Employing the -ttt option in the respective strace invocation should solve the problem.
BUGS
strace-log-merge does not perform any checks whether the files specified are in the correct format and implies that only files from a sin-
gle strace session match STRACE_LOG.* glob pattern.
HISTORY
The initial version of strace-log-merge was written by Denys Vlasenko in 2012.
REPORTING BUGS
Problems with strace-log-merge should be reported to the strace mailing list at <strace-devel@lists.sourceforge.net>.
SEE ALSO
strace(1)
strace UNKNOWN 2018-04-11 STRACE-LOG-MERGE(1)