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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LEARN ABOUT REDHAT
swapoff
SWAPON(8) Linux Programmer's Manual SWAPON(8)
NAME
swapon, swapoff - enable/disable devices and files for paging and swapping
SYNOPSIS
/sbin/swapon [-h -V]
/sbin/swapon -a [-v] [-e]
/sbin/swapon [-v] [-p priority] specialfile ...
/sbin/swapon [-s]
/sbin/swapoff [-h -V]
/sbin/swapoff -a
/sbin/swapoff specialfile ...
DESCRIPTION
Swapon is used to specify devices on which paging and swapping are to take place. Calls to swapon normally occur in the system multi-user
initialization file /etc/rc making all swap devices available, so that the paging and swapping activity is interleaved across several
devices and files.
Normally, the first form is used:
-h Provide help
-V Display version
-s Display swap usage summary by device. Equivalent to "cat /proc/swaps". Not available before Linux 2.1.25.
-a All devices marked as ``swap'' swap devices in /etc/fstab are made available. Devices that are already running as swap are silently
skipped.
-e When -a is used with swapon, -e makes swapon silently skip devices that do not exist.
-p priority
Specify priority for swapon. This option is only available if swapon was compiled under and is used under a 1.3.2 or later kernel.
priority is a value between 0 and 32767. See swapon(2) for a full description of swap priorities. Add pri=value to the option field
of /etc/fstab for use with swapon -a.
Swapoff disables swapping on the specified devices and files. When the -a flag is given, swapping is disabled on all known swap devices
and files (as found in /proc/swaps or /etc/fstab).
NOTE
You should not use swapon on a file with holes. Swap over NFS may not work.
SEE ALSO
swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8)
FILES
/dev/hd?? standard paging devices
/dev/sd?? standard (SCSI) paging devices
/etc/fstab ascii filesystem description table
HISTORY
The swapon command appeared in 4.0BSD.
Linux 1.x 25 September 1995 SWAPON(8)