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 MOJAVE
footprint
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