Re: eXist forcing full GC before heap full?

>
> I am importing a very large XML document, and have set the VM to -Xms and
> -Xmx to 1 GB. Running the VM with -verbosegc, I notice that VM is doing
> repetitive garbage collections when the heap reaches 800 MB, 200 MB short of
> the 1 GB I set. Surprised by this behavior, I did a few thread dumps while
> the import was running, and it seems that those full GCs are forced by
> eXist:
>
> "http-8080-Processor23" daemon prio=5 tid=0x00235910 nid=0x845e00 runnable
> [0xb20b2000..0xb20b2d90]
>        at java.lang.Runtime.gc(Native Method)
>        at java.lang.System.gc(System.java:891)
>        at
> org.exist.storage.NativeBroker.checkAvailableMemory(NativeBroker.java:2932)
>        at org.exist.storage.NativeBroker.storeNode(NativeBroker.java:2381)
>        at org.exist.storage.DBBroker.storeNode(DBBroker.java:503)
>
> Is this an indication that I need to increase the cacheSize setting (which I
> still have at 48 MB)? Can increasing it too much lead to out of memory
> errors? Since eXist is forcing a full GC short of 200 MB before reaching the
> 1 GB max heap size, should I consider increasing cacheSize by close to 200
> MB (say 150 MB, to be on the safe side)?
>
> Ideally, I'd like eXist to automagically use as much memory as possible for
> the cache, up to the max heap size, and free some of the memory used by the
> cache on full garbage collection (sort of what weak references are promised
> to offer). But maybe this isn't realistic?
>
> Alex
>
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