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From "Marco Rolappe" <m_rola...@web.de>
Subject [HELP] determining possible leak
Date Thu, 20 Mar 2003 18:14:05 GMT
hi group,

there's a problem I currently have with a webapp, that makes me go crazy.

the webapp has been live for about two months now, and I think the problem
didn't exist in the beginning.


the problem itself seems to be some leak.

config:
 - linux box (dual processor)
 - tomcat 4.1.18
 - cocoon 2.0.4

symptoms:
 - webapp runs fine for hours (12-24 hours) with a max. cpu usage of about
4%
 - memory usage is continuously rising
 - at some point cpu usage continuously around 100%, distributed to the
processors

strange points:
 - though having specified java option -Xmx128 the memory usage rises above
that value (when viewed in top)
 - discrepancy between memory usage shown by ps/top and memory usage logged
by the store-janitor
	- in the store-janitors's logs the 'JVM total memory' is never above the
maximum specified via -Xmx
	- according to the store-janitor's logs the webapp (cocoon) always has
enough memory (> 15mb)


can anyone explain
 - the discrepancy between the memory usage reported by the store-janitor
and ps/top?
 - where the leak may be? (from the janitor's values I assume it's not
within the JVM but within the java process?)
 - how to determine the kind of leak/where the leak may be

finally, a snip from the janitor's log. please note that top reports a
memory usage of about 223MB. -Xmx is -Xmx196. cpu usage is currently normal.
but this maybe because the JVM's heap size hasn't reached its maximum yet
(according to the janitor).

...
DEBUG   (2003-03-20) 19:01.15:335   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: JVM total Memory: 157827072
DEBUG   (2003-03-20) 19:01.15:336   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: JVM free Memory: 16551888
DEBUG   (2003-03-20) 19:01.15:336   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: Memory is low = false
DEBUG   (2003-03-20) 19:01.25:349   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: JVM total Memory: 157827072
DEBUG   (2003-03-20) 19:01.25:349   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: JVM free Memory: 15666808
DEBUG   (2003-03-20) 19:01.25:350   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: Memory is low = false
DEBUG   (2003-03-20) 19:01.35:369   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: JVM total Memory: 157827072
DEBUG   (2003-03-20) 19:01.35:370   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: JVM free Memory: 18108320
DEBUG   (2003-03-20) 19:01.35:370   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: Memory is low = false
DEBUG   (2003-03-20) 19:01.45:389   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: JVM total Memory: 157827072
DEBUG   (2003-03-20) 19:01.45:390   [core.store.janitor] (Unknown-URI)
Unknown-t
hread/StoreJanitorImpl: JVM free Memory: 17840184
...


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