2006/2/15, Barton Robinson <[EMAIL PROTECTED]>: >From: "Brandt, Mark H" <[EMAIL PROTECTED]> > >Anyone have a recommended virtual machine size for running > >java/tomcat on z/Linux SuSe SLES9 SP2? Also what are the > >recommended params to specify heap space for the apps (Xms and > >Xmx).
[...] You may want to return that answer along with the max address space allowed > by z/Linux SuSe SLES9 SP2. On 32 bit Linux 1900m should work fine On a 31-bit z/Linux environment, --AFAIK there is not a 32-bit Linux for zSeries-- the heap limit may be about 800m. According to [1]: Until Application Server fully supports 64-bit JVMs, the JVM runs in 31-bit mode. The maximum memory any single 31-bit program can obtain is about 800MB. If the JVM is running 31-bit, Linux applies these same rules to determine how much memory the JVM can obtain even when running 64-bit Linux. Starting the JVM with a maximum JVM heap larger than __800MB__ will result in a memory allocation failure because Linux has refused to give the JVM that much memory. There are ways to bend these rules. For example, you can change the mapped_base setting... Ramon [1] WebSphere frequently asked technical questions for zSeries Linux: http://www-128.ibm.com/developerworks/eserver/library/es-was-zseriesfaq.html -- ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
