java - GC pauses of 5 seconds but mark, sweep and compact take less than 1 second -

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i have aix server running jvm process 8 gb heap using gencon gc policy. today had 5s pause time concerning. looked @ event in gc log couldn't figure out time spent.

<con event="collection" id="1" timestamp="oct 22 13:34:10 2015" intervalms="0.000">   <time exclusiveaccessms="0.195" />   <nursery freebytes="871692288" totalbytes="966367232" percent="90" />   <tenured freebytes="375809024" totalbytes="7516192768" percent="4" >     <soa freebytes="0" totalbytes="7140383744" percent="0" />     <loa freebytes="375809024" totalbytes="375809024" percent="100" />   </tenured>   <stats tracetarget="2430736896">     <traced total="2804446392" mutators="2591437504" helpers="213008888" percent="115" />     <cards cleaned="1874" kickoff="102056216" />   </stats>   <con event="remembered set scan">     <stats objectsfound="17649" traced="110458224" timetakenms="129.797" />   </con>   <con event="final card cleaning">     <stats cardscleaned="334" traced="9118008" durationms="7.732" />   </con>   <gc type="global" id="1" totalid="929" intervalms="0.000">     <classloadersunloaded count="162267" timetakenms="4957.805" />     <refs_cleared soft="1942" threshold="32" weak="164659" phantom="0" />     <finalization objectsqueued="120" />     ***<timesms mark="258.390" sweep="33.125" compact="0.000" total="5267.373" />***     <nursery freebytes="904360200" totalbytes="966367232" percent="93" />     <tenured freebytes="3848182720" totalbytes="7516192768" percent="51" >       <soa freebytes="3472373696" totalbytes="7140383744" percent="48" />       <loa freebytes="375809024" totalbytes="375809024" percent="100" />     </tenured>   </gc>   <nursery freebytes="904360200" totalbytes="966367232" percent="93" />   <tenured freebytes="3848182720" totalbytes="7516192768" percent="51" >     <soa freebytes="3472373696" totalbytes="7140383744" percent="48" />     <loa freebytes="375809024" totalbytes="375809024" percent="100" />   </tenured>   <time totalms="5406.538" /> </con>

how can find activity part of full gc taking bulk of pause time?

thanks

time taken scan of class loaders not accounted in total:

<classloadersunloaded count="162267" timetakenms="4957.805" />

you have 162267 class loaders in memory taking 4957.805ms scan. seems known problem, workaround , fix here: http://www-01.ibm.com/support/docview.wss?uid=swg1iz76742


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