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I'm trying to diagnose a memory leak in a process, and looking for a tool to graph its memory usage over time.

Is there any tool on Linux that supports diagramming in a form similar to Windows PerfMon?

I tried using IBM virtual assistant, but it works only on 32-bit, while I have 64-bit platform.

Thanks.

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2 Answers

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Quick hack:

for((i=0;;++i)) { echo $i ` grep VmSize /proc/\`pidof firefox-bin\`/status | grep -o '[0-9]*'`; sleep 1 || break; } > data
^C
graph -T X data

The same could be done for things other than "VmSize".

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Useless use of cat. – Dennis Williamson Mar 16 '10 at 21:43
This seems most interesting approach. 1) What I need installed on CentOS for graph to work? 2) Why cat is useless? – SyRenity Mar 17 '10 at 12:18
Actually, from what I read so far VMSize seems to show only part of the picture. So far the most useful tool for me was ps_mem from here (pixelbeat.org/scripts/ps_mem.py). The only question is how to plot the resulting graph - I just can't find this "graph" tool on Linux. – SyRenity Mar 17 '10 at 21:23
Fixed "useless use of cat" – Vi. Mar 18 '10 at 18:37
graph is from plotutils package on Debian. For CentOS it should be something like dag.wieers.com/rpm/packages/plotutils You can also request -T svg instead of -T X if you want to insert the plot somewhere. – Vi. Mar 18 '10 at 18:39
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We use Cacti, which is the next gen MRTG, to graph system memory usage.

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Can it monitor a single process? – SyRenity Mar 17 '10 at 12:17
To monitor a single process, see the documentation on SNMP for adding a custom command to the SNMP values. The use something like ps with grep and/or awk to find the memory values for your process and output it as a value. Then in Cacti, graph this value as a gauge. – Walter Mar 17 '10 at 15:43
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