Leon, Thank you for the link, but this is not my experience. I have been running a pretty intensive data analysis application on 64-bit Java on two dual-Opteron servers for almost two years now. We have been on the Sun compiler for over year (were on the IBM 64-bit compiler before that). Here is our version info:
kingfish:~/jakarta-tomcat-5.5.7/logs> java -version java version "1.5.0_01" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_01-b08) Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_01-b08, mixed mode) kingfish:~/jakarta-tomcat-5.5.7/logs> It seems that we are on 1.5, but an earlier version than the one in the link (1.5.0_05-b05), plus the link is for Solaris-SPARC not for AMD64 architecture. We have had nothing but stability and great performance since moving to 64-bit. We have not noticed more memory use, but there certainly could be some incremental increase. But with RAM as cheap as it is, we can add another 2GB of quality ECC memory for about $325. - Richard -----Original Message----- From: Leon Rosenberg [mailto:[EMAIL PROTECTED] Sent: Sunday, January 22, 2006 4:01 AM To: Tomcat Users List Subject: Re: increase limit Xmx On 1/22/06, Richard Mixon <[EMAIL PROTECTED]> wrote: > Andri, > > I'm guessing that you are using a 32-bit version of (SuSE) Linux > Enterprise 9. You need to use the 64-bit version to get heap sizes > greater than 2GB (actually it ends up being closer to th 1800m as you > have experience). An of course your hardware needs to support 64-bit > (e.g. with AMD64 chips such as Opterons or Intels EMT64 clones). Just a bit of advice: Please note that current 64bit java vm for amd64/xeon emt64 has serious bugs in HotSpot compiler, so you should better wait until 07 is released: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6346871 regards Leon P.S. You should also consider that the usage of 64bit java will increase you memory usage. > > Now of course, switching to 64-bit OS and hardware may not be an option. > Something that sometimes works for others is to run two or more > instances of Tomcat - with each getting the 1800M of heap. Of course > there must be real memory/RAM to support this, but some 32-bit > machines can support 4GB of RAM (maybe more, I'm not sure) - the 2GB > (or slightly less) limit is for a single process, such as the JVM that Tomcat runs in. > > With the multiple Tomcat's running, of course you need some way to > load balance requests across the two instances - you can search the > archives of this list for many, many discussions on how to do this. > > HTH - Richard > > -----Original Message----- > From: Andri Herumurti [mailto:[EMAIL PROTECTED] > Sent: Friday, January 20, 2006 7:38 PM > To: users@tomcat.apache.org > Subject: increase limit Xmx > > how to increase limit of Xmx? > > i use suse linux enterprise server 9, but i need to increase the > limit of Xmx so it can become more than 1800m? > > Thanks > Andri > > > --------------------------------- > > What are the most popular cars? Find out at Yahoo! Autos > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
