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Full Discussion: defunct processes?
Top Forums UNIX for Advanced & Expert Users defunct processes? Post 302423471 by steadyonabix on Friday 21st of May 2010 05:49:30 AM
Old 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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FOOTPRINT(1)						    BSD General Commands Manual 					      FOOTPRINT(1)

NAME
footprint -- gathers memory information about one or more processes SYNOPSIS
footprint [-j path] [-f bytes|formatted|pages] [-p name|pid] [-x name|pid] [-t] [-s] [-v] [-y] [-w] [--swapped] [--wired] [-a] process-name | pid | memgraph [...] footprint -h, --help DESCRIPTION
The footprint utility gathers and displays memory consumption information for the specified processes or memory graph files. footprint will display all addressable memory used by the specified processes, but it emphasizes memory considered 'dirty' by the kernel for purposes of accounting. If multiple processes are specified, footprint will de-duplicate multiply mapped objects and will display shared objects separately from private ones. footprint must be run as root when inspecting processes that are not owned by the current user. OPTIONS
-a, --all target all processes (will take much longer) -j, --json path also save a JSON representation of the data to the specified path -f, --format bytes|formatted|pages textual output should be formatted in bytes, pages, or human-readable formatted (default) -p, --proc name target the given process by name (can be used multiple times) -p, --pid pid target the given process by pid (can be used multiple times) -x, --exclude name/pid exclude the given process by name or pid (can be used multiple times) often used with --all to exclude some processes from analysis -t, --targetChildren in addition to the supplied processes, target their children, grandchildren, etc. -s, --skip skip processes that are dirty tracked and have no outstanding XPC transactions (i.e., are "clean") -v display vmmap-like output of address space layout -y, --summary print only regions with dirty memory, and condense __TEXT, __DATA, and __LINKEDIT regions into 'Other' subtotal -w, --wide show wide output with all columns (implies --swapped --wired) --swapped show swapped/compressed column, a subset of 'dirty' --wired show wired memory column, a subset of 'dirty' -h, --help display help and exit SAMPLE USAGE
footprint Mail WindowServer OS X
January 29, 2018 OS X
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