We have a /3GB switch (and the /PAE switch active), but the allocation limit is still 1500m. We were using j2sdk-1_4_2_03 and tomcat-5.0.19. I have now tried the combination jdk-1_5_0_06 and tomcat-5.5..17.exe with the same poor result. So something seems to be wrong but what is it?
Rg. Elly -----Oorspronkelijk bericht----- Van: Mark Thomas [mailto:[EMAIL PROTECTED] Verzonden: donderdag 6 juli 2006 3:25 Aan: Tomcat Users List Onderwerp: Re: tomcat memory allocation Speulman, Elly wrote: > Hi, > > Is there anyone out there who has been able to configure more than 1550M for > Tomcat 5.0 on a Windows advanced server installation. The server has a total > of 4Gb of memory. We are just not able to cross a border. > Config of Tomcat memory takes place via the Tomcat configuration buttons. > Perhaps someone even has a solution? This is a windows limitation. Do a Google for /3GB and /PAE boot.ini switches. The maximum memory varies by version (2003 is 32GB, 2003 SP1 is 64GB) and I can't remember them all but the short (actually quite long) answer is: The default windows installation has a maximum of 4GB RAM. Of this, the kernel is allocated 2GB and user processes the rest with a maximum per process of 2GB (although in practice is is usually around 1.6GB). The /PAE switch should make all the physical memory in your machine visible to windows up to the maximum supported by your OS and SP versions. However, 2GB is still allocated to the kernel and user process are still limited to 2GB (really 1.6GB) each. The /3GB switch reduces the kernel allocation to 1GB and makes 3GB (really about 2.6GB) available per user process but total memory is still limited to 4GB. Using both /PAE and /3GB together gets 'interesting'. kernel memory is reduced to 1GB, user processes limited to 3GB per process and total memory is the smallest of physical memory, OS/SP maximum and 16GB. Note the 16GB upper limit. This caught me out recently on a 48GB windows box. On your box, I would use the /3GB switch but be aware of the 16GB upper limit for total system memory in this case. HTH, Mark --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -------------------------------------------------------------------------------------------- Dit bericht is uitsluitend bestemd voor de hierboven genoemde geadresseerde(n) en kan vertrouwelijke informatie bevatten. Indien het mailbericht verkeerd is geadresseerd verzoeken wij u dringend ons dit te laten weten (telefonisch of per mail). Verspreiding en/of openbaarmaking van dit mailbericht aan derden is strikt verboden. -------------------------------------------------------------------------------------------- --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
