How to read/analyze IBM GC log?

[benjamin_houttuin]

Dear SDN,

I need some help on the following...

We are running SAP Java 7.01 on IBM AIX (so also using the IBM JVM)

On our test system we have had 2 OutOfMemory crashes, 7 days apart.

I investigated the std_server0.out but I find it hard to read the GC log of the IBM JVM.

I tried to find some info on how to read it on the WWW but I couldn't find it so that is why I ask you.

How do I read the flowing GC log (FYI the log is the last entry before the OOM occurred)

<af type="nursery" id="112" timestamp="Wed Oct 06 01:38:53 2010" intervalms="10399990.030">
  <minimum requested_bytes="48" />
  <time exclusiveaccessms="0.504" />
  <nursery freebytes="0" totalbytes="966367232" percent="0" />
  <tenured freebytes="327679864" totalbytes="1073741824" percent="30" >
    <soa freebytes="273993592" totalbytes="1020055552" percent="26" />
    <loa freebytes="53686272" totalbytes="53686272" percent="100" />
  </tenured>
  <gc type="scavenger" id="112" totalid="112" intervalms="10400002.113">
    <flipped objectcount="1170630" bytes="94848776" />
    <tenured objectcount="9144" bytes="686824" />
    <refs_cleared soft="1458" weak="29431" phantom="0" />
    <finalization objectsqueued="2557" />
    <scavenger tiltratio="87" />
    <nursery freebytes="846758160" totalbytes="943444992" percent="89" tenureage="14" />
    <tenured freebytes="326500216" totalbytes="1073741824" percent="30" >
      <soa freebytes="272813944" totalbytes="1020055552" percent="26" />
      <loa freebytes="53686272" totalbytes="53686272" percent="100" />
    </tenured>
    <time totalms="451.073" />
  </gc>
  <nursery freebytes="846756112" totalbytes="943444992" percent="89" />
  <tenured freebytes="326500216" totalbytes="1073741824" percent="30" >
    <soa freebytes="272813944" totalbytes="1020055552" percent="26" />
    <loa freebytes="53686272" totalbytes="53686272" percent="100" />
  </tenured>
  <time totalms="453.159" />
</af>

Thanks in advance!

Benjamin

[benjamin_houttuin]

Nevermind....I already found the answer myself...

http://www-01.ibm.com/support/docview.wss?uid=swg21222486

http://publib.boulder.ibm.com/infocenter/javasdk/v1r4m2/index.jsp?topic=/com.ibm.java.doc.diagnostic...

http://publib.boulder.ibm.com/infocenter/javasdk/v5r0/index.jsp?topic=/com.ibm.java.doc.diagnostics....