Re: Optimized memory Parameter in Tomcat.
This totally depends on what your application does. So nobody on this list can say something about it based the information you give. 2GB is quite a lot of memory, so I think your application has plenty of memory unless it is a very memory hungry program. On 32 bits machines 2GB is a maximum amount per process for java code + native code, so giving java 2GB leaves no room for native code and makes your java crash with out-of-memory if the application uses a lot of memory for java objects. On 64 bits machines this limit is a lot higher than 2GB. You can also use jstat to few the realtime memory usage of your jvm. jps gives the process-id's of the java processes jstat -gc process-id 1000 gives the memory usage every 1000 miliseconds. See the documentation for more info about jstat. Greetings, Ronald. Op vrijdag, 19 december 2008 om 12:55 uur schreef Tomcat Users List users@tomcat.apache.org: Hi All, Hope all are fine and enjoying best of health... thats good to know :D Here is my question. our Tomcat 6 server is running on a RHL machine with 4 GB Ram. i have adjusted memory parameters as JAVA_OPTS=$JAVA_OPTS -Xms1024M -Xmx2048M -XX:PermSize=128m -XX:MaxPermSize=128m server is working fine with these parameters but i wnt to know that are these parameters fine with my application or i need to change them for better performance? my server is running a Spring Framework mvc based application. with these parameters most of time i get following stats when i execute free -m command on server in peak hours (or something like that). [r...@vopium ~]# free -m total used free sharedbuffers cached Mem: 4050 3622428 0385 2335 NOTE: only apache and tomcat is running on this machine. no other heavy service running on this server. Regards, newbi -- View this message in context: http://www.nabble.com/Optimized-memory-Parameter-in-Tomcat.-tp21090101p21090101.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Optimized memory Parameter in Tomcat.
From: kashif_tomcat [mailto:kas...@vopium.com] our Tomcat 6 server is running on a RHL machine with 4 GB Ram. 32-bit or 64-bit OS? JAVA_OPTS=$JAVA_OPTS -Xms1024M -Xmx2048M -XX:PermSize=128m -XX:MaxPermSize=128m You probably want to make -Xms and -Xmx the same. There's no point fragmenting the heap if you don't need to. server is working fine with these parameters but i wnt to know that are these parameters fine with my application or i need to change them for better performance? You are the only person who can answer that question, by monitoring and profiling your application. Performance is often 1% Tomcat and 99% application. with these parameters most of time i get following stats when i execute free -m command on server in peak hours (or something like that). [r...@vopium ~]# free -m total used free shared buffers cached Mem: 4050 3622428 0 385 2335 Looks healthy enough. NOTE: only apache and tomcat is running on this machine. no other heavy service running on this server. Why are you running Apache httpd as well as Tomcat? Because the book told me to or because you have a real need for it? - Peter - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Optimized memory Parameter in Tomcat.
Peter, System is 32 bit. i want to change memory parameters. what i feel is that 1GB(min) and 2GB(max) is very high value. but i can't test it by hit and try coz its our production server. i have used 5 times heavier application then this one with 200mb (min) and 3.5G( maxm) parameters and it worked fine. therefore i feel that i should fine tune these parameters...(low parameter value with good result) i am using apache coz front end is hosted in apache. but i think i should use j consol or jstat like something... Peter Crowther wrote: From: kashif_tomcat [mailto:kas...@vopium.com] our Tomcat 6 server is running on a RHL machine with 4 GB Ram. 32-bit or 64-bit OS? JAVA_OPTS=$JAVA_OPTS -Xms1024M -Xmx2048M -XX:PermSize=128m -XX:MaxPermSize=128m You probably want to make -Xms and -Xmx the same. There's no point fragmenting the heap if you don't need to. server is working fine with these parameters but i wnt to know that are these parameters fine with my application or i need to change them for better performance? You are the only person who can answer that question, by monitoring and profiling your application. Performance is often 1% Tomcat and 99% application. with these parameters most of time i get following stats when i execute free -m command on server in peak hours (or something like that). [r...@vopium ~]# free -m total used free shared buffers cached Mem: 4050 3622428 0 385 2335 Looks healthy enough. NOTE: only apache and tomcat is running on this machine. no other heavy service running on this server. Why are you running Apache httpd as well as Tomcat? Because the book told me to or because you have a real need for it? - Peter - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- View this message in context: http://www.nabble.com/Optimized-memory-Parameter-in-Tomcat.-tp21090101p21091798.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Optimized memory Parameter in Tomcat.
Peter, System is 32 bit. i want to change memory parameters. what i feel is that 1GB(min) and 2GB(max) is very high value. but i can't test it by hit and try coz its our production server. i have used 5 times heavier application then this one with 200mb (min) and 3.5G( maxm) parameters and it worked fine. therefore i feel that i should fine tune these parameters...(low parameter value with good result) i am using apache coz front end is hosted in apache. but i think i should use j consol or jstat like something... Peter Crowther wrote: From: kashif_tomcat [mailto:kas...@vopium.com] our Tomcat 6 server is running on a RHL machine with 4 GB Ram. 32-bit or 64-bit OS? JAVA_OPTS=$JAVA_OPTS -Xms1024M -Xmx2048M -XX:PermSize=128m -XX:MaxPermSize=128m You probably want to make -Xms and -Xmx the same. There's no point fragmenting the heap if you don't need to. server is working fine with these parameters but i wnt to know that are these parameters fine with my application or i need to change them for better performance? You are the only person who can answer that question, by monitoring and profiling your application. Performance is often 1% Tomcat and 99% application. with these parameters most of time i get following stats when i execute free -m command on server in peak hours (or something like that). [r...@localhost ~]# free -m total used free shared buffers cached Mem: 4050 3622428 0 385 2335 Looks healthy enough. NOTE: only apache and tomcat is running on this machine. no other heavy service running on this server. Why are you running Apache httpd as well as Tomcat? Because the book told me to or because you have a real need for it? - Peter - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- View this message in context: http://www.nabble.com/Optimized-memory-Parameter-in-Tomcat.-tp21090101p21091800.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
