[wellylug] Java 32 Bit/ Java 64 Bit Performance

[Anton]

2009/4/28 Gerald.Roehrbein <Gerald.Roehrbein at oraforecast.com>:
> Hello,
>
> I've tested Java with 32/64 Bit Linux and 32/64 Bit data model.
> Results:
>
> a) 32 Bit Linux + 32 Bit Java memory model gave best performance
> especially with memory allocation. Test program took 45 minutes.
>
> b) 64 Bit Linux + 32 Bit Java memory model gave bad performance. Test
> program took 90 minutes.
>
> c) 64 Bit Linux + 64 Bit Java memory model gave good performance. Test
> program took 70 minutes.

We've definitely noticed the increase in memory usage you get with a
64bit JVM - at least 50% more. This was on a server running a whole
lot of teamcity build agents.

But although there were some underlying hardware differences between
our 32 and 64 bit servers, it seems the 64bit JVM performed better
than the 32bit one.

-- 
Cheers
Anton