Application memory use

[Henri Gomez]

OpenJDK 7 is a 64bits JVM whereas Apple JDK 6 is a 32/64 bits VM.
So larger memory footprint.

I allready pointed this and we should wait OpenJDK 7 for OSX to
re-enable a 32/64bits VM mode or at least pointers compression (it's
no more the case).


2012/4/23 Michael Hall <mik3hall at gmail.com>:
> I am noticing what seems to be some memory issues running my application on openjdk versus on Java 6.
> Currently in Activity monitor it shows 140.2 MB real mem versus 70.6 for a 1.6 version of the application
> It has fairly consistently seemed to be showing that it's using twice as much memory.
>
> I started up jconsole. (With 1.6 , the 1.7 doesn't appear to work? seems to just show a truncated duke image??)
> The 1.6 appeared to sawtooth memory in a range, 1.7 seems to climb steady with very infrequent drops.
> The current information that jconsole shows.
>
> 1.6
> Used: 17,248 KB
> Committed: 21,968 KB
> Max: 253,440 KB
> GC time 1.978 sec on MarkSweepCompact(8 collections)
>                2.808 sec on Copy (85 collections)
>
> 1.7
> Used 70,773 KB
> Committed 120,384 KB
> Max: 233,024 KB
> GC time 8.138 sec on PS Scavenge (68 collections)
>               2.141 sec on PS MarkSweep(6 collections)
>
> Are there any concerns or things developers should be aware of in this area?
>