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POJava HotSpot 1.6 VM, Garbage Collection - Scary PermGen
 

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  1. POJava HotSpot 1.6 VM, Garbage Collection - Scary PermGen
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    <p>My app shows rising 'Old Generation'/'Tenured Generation' size, and when this reaches the max limit for 'Old Gen', then suddenly PermGen size increases. Here are my generation sizings:</p> <pre><code>-Xmx1200m -Xms1200m -Xmn450m -XX:MaxPermSize=600m -XX:+UseParallelGC </code></pre> <p>This is on 32 bit Fedora so can't have a bigger heap than this.</p> <p>The app is not doing any fancy classloading, though it is using Spring IOC and Hibernate, the Spring App-context.xml defines some 1000 Beans.</p> <p>This app starts with 175MB PermGen, which steadily increases to ~250MB in few hrs, stays that way till Tenured Generation reached ~780 MB, then permgen jumps to ~500MB while Old Gen drops to ~500MB.</p> <p>This forces me to restart the App on daily basis, and gives me real scare of looming OutOfMemory Error.. Any insights would be very helpful.</p> <p>Thanks Gala101</p> <p>13/May: Could someone please throw light on what happens when 'Old Gen' is garbage collected? <br /> Does the jvm put collections from 'Old Gen' into PermGen? <br /> My PermGen spike comes only when collection happens from 'Old Gen', also decrease in OldGen size closely matches increase in PermGen size.<br /> PS: I don't do any live deploy/undeploy as that's sure to eat up PermGen.<br /> Below is a current spanshot from my monitoring page: (the committed part had just jumped from ~250 MB to 500 MB)</p> <pre><code> PS Perm Gen Type Non-heap memory Usage init = 16777216(16384K) used = 254453736(248489K) committed = 504954880(493120K) max = 629145600(614400K) Peak Usage init = 16777216(16384K) used = 254453736(248489K) committed = 504954880(493120K) max = 629145600(614400K) Collection Usage init = 16777216(16384K) used = 252421536(246505K) committed = 504954880(493120K) max = 629145600(614400K) </code></pre>
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    1. USGala101
    1. USGala101
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    1. COAs far as I know the MaxPermSize cannot be more than 256MB...
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      1. USBozhidar Batsov
    2. CO@Bozhidar: Not true, the PermGen size can be much larger than that
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      1. USskaffman
 

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