It's a web server processing the exact same # of requests as before. It was running into GC pause / OOM issues before when we were limited to a 1.2 GB heap by the 32 bit JDK. And yes, the real issue is to cache (or more exactly clear caches) properly but that's harder to solve :-)
So we switched to 64 bit in order to set a 3 GB heap. This alleviated the memory contention and has made the service more stable / run longer w/o needing restart We definitely expected some degree of increased CPU with the 64 bit stuff but what we're seeing is huge - more than 2X increase in CPU. Maybe that's just par for the course given what we've done but I can't help feel like I'm missing something tuning wise. On Fri, Feb 11, 2011 at 8:49 AM, Eric <e.d.program...@gmail.com> wrote: > I'm running the 64 bit JDK on my laptop but I've only begun to compile > programs on it so I don't know much about performance differences. I > thought 64 bit was supposed to be better at using up memory to get > more performance. > Is more CPU usage a good thing? Is there a noticeable performance > increase? > > On Feb 10, 10:09 pm, Sean Comerford <sean.c.comerf...@gmail.com> > wrote: > > Any of you posse people have much experience running the 64 bit 1.6 > Oracle > > JVM on Windows? > > > > We recently cut some services over to it, using the CompressedOOPS. > > > > Accomplishes the goal of giving us 4 GB heaps but the extra cost in CPU > > usage seems excessively high. We expected some penalty in this respect > but > > same app now seems to be using more than double the CPU. > > > > Guess I'm just wondering if we're missing some big dial that only applies > to > > 64 bit. > > -- > You received this message because you are subscribed to the Google Groups > "The Java Posse" group. > To post to this group, send email to javaposse@googlegroups.com. > To unsubscribe from this group, send email to > javaposse+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/javaposse?hl=en. > > -- You received this message because you are subscribed to the Google Groups "The Java Posse" group. To post to this group, send email to javaposse@googlegroups.com. To unsubscribe from this group, send email to javaposse+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/javaposse?hl=en.
