08-29-2008
per-process swap usage?
I've been trying to write a monitor program that gets various values on the processes running and makes reports. One of the values that I wanted to monitor was swap usage, so that we can ensure that our swap space doesn't fill up, but I can't seem to get this number (on a per-process basis) from either 'top' or 'ps'.
I've tried everything I can think of. Can anyone tell me how to do this?
On my system, I run top and ps and sum up some of the numbers and I get these:
top vsize within 5% ps vsize: 1.0%
top rss within 5% ps rss: 98.3%
Resident set size: 6.422G
Top vsize: 11.980G
PS vsize: 144.780G
PS size: 88.384G
These are the totals I get from the 'top' header. This (roughly) agrees with the vmstat numbers.
Total Mem used, from top: 7.590G
Total Swap used, from top: 5.233G
Total Virtual Mem used: 12.823G
Now you see the closest thing to matching the total virtual memory above is the top vsize, and maybe I can get swap usage by subtracting top vsize from RSS, but the above was run on RH3. If I run the same script on RH5 (we have RH3 and RH5 machines), I get the following:
top vsize within 5% ps vsize: 99.7%
top rss within 5% ps rss: 97.1%
Resident set size: 5.059G
Top vsize: 84.335G
PS vsize: 84.485G
PS size: 6.357G
Total Mem used, from top: 7.751G
Total Swap used, from top: 0.000G
Total Virtual Mem used: 7.751G
As you can see, now the top vsize is way off.
I also tried subtracting out the shared memory (taken from top), but that only lowered the numbers by less than 5%.
There has to be a better way...
--Buck
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