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Java Forum / General / July 2006tuning the GC
I have a problem tuning the jvm for garbage collection. i have refered the many sites but not able to tune the jvm . can any one pls help me to tune the jvm for garbage collection. i am using java Version 1.5.0 > I have a problem tuning the jvm for garbage collection. i have refered > the many sites but not able to tune the jvm . can any one pls help me > to tune the jvm for garbage collection. > i am using > java Version 1.5.0 Do you have a specific question?  SignatureChris Smith - Lead Software Developer / Technical Trainer MindIQ Corporation > > I have a problem tuning the jvm for garbage collection. i have refered > > the many sites but not able to tune the jvm . can any one pls help me [quoted text clipped - 7 lines] > Chris Smith - Lead Software Developer / Technical Trainer > MindIQ Corporation hi Chris Smith I am working on web application it was giving me java heap space error so i increased the heap space in tomcat . but wat i observed is it is not a correct solution for it ,this error is due to garbage collection and i am not getting a correct way to tune the jvm. my system is uniprocessor with 1GB RAM i want some good algorithm and the way they can be included. can u help me out. Hi, I suppose, that has nothing to do with the GC. I think, you have a memory leak! I guess you have to do more that just tune on some VM-parameters - review your code! Ciao, Ingo but how do i check it is memory leak or gc problem . well i was trying to configure jconsole to my web application but it is not working out, i am not able to configure it . the reasone i conclude to tune gc is that the throughput have decreased after its heap size is increased. therfore i have to decrease heap size for which i have to tune gc. present heap size is -Xms256m -Xmx512m Hi, > but how do i check it is memory leak or gc problem . Well, I never heard that suns GC is buggy in the way that it produces memory leaks. An idea would be to change to another JVM-implementation. If the error occurs there as well (I bet so), then chances are good that it is a programming error which produces memory leaks. Ciao, Ingo > but how do i check it is memory leak or gc problem . well i was trying > to configure jconsole to my web application but it is not working out, [quoted text clipped - 3 lines] > therfore i have to decrease heap size for which i have to tune gc. > present heap size is -Xms256m -Xmx512m Check whether you are causing memory thrashing with the larger heap size. That can happen if the program is actively using more than the available physical memory. In a thrashing state the disk I/O rate is very high, and the program's CPU utilization drops to about 2%. If you do have a memory leak in your program, the heap size parameter just lets you choose how to fail, running out of heap space or thrashing. Patricia > I am working on web application it was giving me > java heap space error so i increased the heap space in tomcat . but [quoted text clipped - 4 lines] > i want some good algorithm and the way they can be included. > can u help me out. You could be running out of perm space. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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