All
Thank you all for the replies & the scripts. It is true that we can find the results through tests. http://docs.sun.com/app/docs/doc/819-3681/abeii?a=view says that maximum address space for a process in 32 bit version of Linux is 2 GB. But am not sure for which version of JRE this limitation is applicable. In particular, I expect JRE 1.6 will be able to address more than 2 GB of space. In our environment we start Tomcat through org.apache.catalina.startup.Bootstrap Before we try our tests with different values for Xmx woud like to know, if anyone had tried tomcat with higher values for Xmx. Thanks > Date: Fri, 8 Jan 2010 16:00:43 -0500 > From: ch...@christopherschultz.net > To: users@tomcat.apache.org > Subject: Re: Max heap size > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Chuck, > > On 1/8/2010 3:34 PM, Caldarale, Charles R wrote: > >> From: Christopher Schultz [mailto:ch...@christopherschultz.net] > >> Subject: Re: Max heap size > >> > >> Here's an updated script to check for maximum heap. > > > > Just remember that this measures the maximum heap available to an > > extremely simple process. For a complex execution like Tomcat or some > > other app server, the amount of space needed for non-heap structures > > (e.g., open file descriptions, additional native libraries, stacks) > > might have to be traded off against the Java heap. > > Fair enough, but I don't believe the JVM checks the "size" of the code > to be run before deciding if it can launch the JVM: it will simply > attempt to allocate the memory you request and then launch your main method. > > Had I used org.apache.catalina.Bootstrap as the main class within the > same script, I suspect I would have gotten the same results for my > maximum heap test. > > There's nothing to say that the JVM wouldn't shut down after some time > because it ran out of native heap, etc. but I don't think the size of > the test case here is all that relevant. > > - -chris > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.10 (MingW32) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iEYEARECAAYFAktHnPsACgkQ9CaO5/Lv0PBH8gCfURoUAUZ5qSF2mD8qg45jJnOH > twsAn2bBKC46vDLaWdYbVTmm5CrqfdUI > =Pu6U > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > _________________________________________________________________ Windows Live Hotmail: Your friends can get your Facebook updates, right from Hotmail®. http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:en-xm:SI_SB_4:092009
