ive been running a big-ish webapp (both in development and production) on a 64bit JVM for about a month and have not noticed such dramatic performance drop. But them again, im not running windows nor using compressedOOPs - maybe its one of those?
On Fri, Feb 11, 2011 at 2:21 PM, Sean Comerford <sean.c.comerf...@gmail.com>wrote: > 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. > -- http://mapsdev.blogspot.com/ Marcelo Takeshi Fukushima -- 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.
