05-21-2010
defunct processes?
HiI had a tool fail recently, on analysis I found it was cleaning up orphaned directories that had been created by specific processes that had died for some reason, thus failing to clean up after themselves.The directories were of the form /dir.pid. The tool would look to see if any instances of the process were running under that pid and if not would clear away the directory. It was failing because intermmittently it was seeing a instance of the pid in the ps output.I put a trap in for this (grep -vi) and all seemed well but I have now seen it fail once more, unfortunately with no trace on. I cannot replicate it as it is now so intermittent with the fix I mentioned in place.My question is "Are there any other ways a dead process can show up in the ps output and if so what should I be grepping for"?CheersPS Sorry if the format of this post is rough, my work PC is locked down and doesn't seem able to handle the java very well.
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LEARN ABOUT LINUX
cg_annotate
CG_ANNOTATE(1) Release 3.7.0 CG_ANNOTATE(1)
NAME
cg_annotate - post-processing tool for Cachegrind
SYNOPSIS
cg_annotate [options] cachegrind-out-file [source-files...]
DESCRIPTION
cg_annotate takes an output file produced by the Valgrind tool Cachegrind and prints the information in an easy-to-read form.
OPTIONS
-h --help
Show the help message.
--version
Show the version number.
--show=A,B,C [default: all, using order in cachegrind.out.<pid>]
Specifies which events to show (and the column order). Default is to use all present in the cachegrind.out.<pid> file (and use the
order in the file). Useful if you want to concentrate on, for example, I cache misses (--show=I1mr,ILmr), or data read misses
(--show=D1mr,DLmr), or LL data misses (--show=DLmr,DLmw). Best used in conjunction with --sort.
--sort=A,B,C [default: order in cachegrind.out.<pid>]
Specifies the events upon which the sorting of the function-by-function entries will be based.
--threshold=X [default: 0.1%]
Sets the threshold for the function-by-function summary. A function is shown if it accounts for more than X% of the counts for the
primary sort event. If auto-annotating, also affects which files are annotated.
Note: thresholds can be set for more than one of the events by appending any events for the --sort option with a colon and a number (no
spaces, though). E.g. if you want to see each function that covers more than 1% of LL read misses or 1% of LL write misses, use this
option:
--sort=DLmr:1,DLmw:1
--auto=<no|yes> [default: no]
When enabled, automatically annotates every file that is mentioned in the function-by-function summary that can be found. Also gives a
list of those that couldn't be found.
--context=N [default: 8]
Print N lines of context before and after each annotated line. Avoids printing large sections of source files that were not executed.
Use a large number (e.g. 100000) to show all source lines.
-I<dir> --include=<dir> [default: none]
Adds a directory to the list in which to search for files. Multiple -I/--include options can be given to add multiple directories.
SEE ALSO
valgrind(1), $INSTALL/share/doc/valgrind/html/index.html or http://www.valgrind.org/docs/manual/index.html.
AUTHOR
Nicholas Nethercote.
Release 3.7.0 06/05/2012 CG_ANNOTATE(1)