On Tue, 2002-10-29 at 00:10, [EMAIL PROTECTED] wrote: > Hello, > > I have tomcat 4.1.10 on a red hat Linux server 7.3 with the j2sdk141, > > When I start the tomcat4 service, all is OK and the tomcat server run. > > BUT, when I look the memory usage (with TOP utility), I have this result : > > 11:31am up 12 days, 2:18, 2 users, load average: 0,00, 0,00, 0,00 > 90 processes: 87 sleeping, 3 running, 0 zombie, 0 stopped > CPU states: 0,0% user, 0,5% system, 0,0% nice, 99,4% idle > Mem: 514340K av, 479748K used, 34592K free, 0K shrd, 75716K > buff > Swap: 1048120K av, 35016K used, 1013104K free 216648K > cached > > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND > 19954 tomcat4 25 0 33584 32M 10464 S 0,0 6,5 0:05 java > 19957 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19958 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19959 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19960 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19961 tomcat4 15 0 33584 32M 10464 R 0,0 6,5 0:00 java > 19962 tomcat4 20 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19963 tomcat4 16 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19964 tomcat4 16 0 33584 32M 10464 S 0,0 6,5 0:01 java > 19966 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19967 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19968 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19969 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19970 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19971 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19972 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > 19973 tomcat4 15 0 33584 32M 10464 S 0,0 6,5 0:00 java > > So, > > My first question is : why tomcat use all the memory while there is no > users connected (or just one) ?
Ah well, it's Java, that's why. There is a lot of side stuff going on in a JVM that requires heaps (no pun intended) memory (i.e. you have to pay for having strong runtime typing, no buffer overflows, run anywhere...). > My second question is : how much memory is needed if I want to use tomcat > with many users (500, 1000,...) ? Huh, depends on what your applications do, really. For so many concurrent users Tomcat will create separate threads, which means separate local storage for all of them. Then there is the garbage collection algorithm, which is usually "lazy", so more then absolutely necessary will be allocated etc. > I already read in the forum Tomcat don't manage the memory, it is the > JVM... so why the jvm use so many processes ? This is configurable in server.xml, I think. However, if you under configure it, some clients may be left out. Bojan -- To unsubscribe, e-mail: <mailto:tomcat-dev-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:tomcat-dev-help@;jakarta.apache.org>
