Re: [The Java Posse] Re: 64bit JDK on Windoze?
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 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 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 >> 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.
Re: [The Java Posse] Re: 64bit JDK on Windoze?
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 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 > 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.
[The Java Posse] Re: 64bit JDK on Windoze?
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 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.
