Hi Jonathan,
the "cached" memory is already collected by Xymon (via "vmstat") and graphed in vmstat.rrd. Unfortunately there seems to be no default graphing-defintion to display the collected values. As a quick hack the attached graphing-definition at the bottom can be used (see the comment in the file for some details).
If you want to trigger an event based on the value of cached memory you can fetch the collected values with the bb(1) "clientlog"-command and feed them to a rrd: $ ~/server/bin/bb localhost "clientlog name-of-the-host section=vmstat" [vmstat] procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 120 24664 245736 42392 0 0 0 8 40 48 1 1 98 0 0 0 120 25704 245736 42376 0 0 0 7 42 49 1 1 98 0
HTH,
Thomasgraphing-definition hack: --- snipp ---
graphing defintion to display of cached memory (based on [vmstat6] from
Xymon-4.3.0_beta2)
use by appending "TRENDS:*,vmstat:vmstat_cach" in bb-hosts for the hosts to
display cached memory for:
[vmstat_cach] # This graph only works on some OS'es (Solaris) TITLE Memory (cache) Utilization YAXIS Size kB -b 1024 DEF:free=vmstat.rrd:mem_free:AVERAGE CDEF:fr=free,1024,* DEF:cached=vmstat.rrd:mem_cach:AVERAGE CDEF:cach=cached,1024,* LINE2:fr#0000ff:Size of the free list LINE2:cach#00FF00:Size of cached memory COMMENT:\n GPRINT:fr:LAST:Size of the free list \: %5.1lf%s (cur) GPRINT:fr:MAX: \: %5.1lf%s (max) GPRINT:fr:MIN: \: %5.1lf%s (min) GPRINT:fr:AVERAGE: \: %5.1lf%s (avg)\n GPRINT:cach:LAST:Currently cached memory \: %5.1lf%s (cur) GPRINT:cach:MAX: \: %5.1lf%s (max) GPRINT:cach:MIN: \: %5.1lf%s (min) GPRINT:cach:AVERAGE: \: %5.1lf%s (avg)\n --- snipp ---
On Fri, 19 Feb 2010, Jonathan B. Horen wrote:
Has anyone patched Xymon so that cached memory is displayed together with real, actual, and swap?
We have need of this (cluster compute nodes), and were wondering what it would take to do so.
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