Howdy, I recall reading something about a redhat issue with this. I'm not a redhat expect, so I don't know for sure. But I do know for sure you can conclude very little from the top command in general.
Yoav Shapira Millennium ChemInformatics >-----Original Message----- >From: Jens Ove Lillegraven [mailto:[EMAIL PROTECTED] >Sent: Thursday, November 13, 2003 9:18 AM >To: Tomcat Users List >Subject: Re: How to tune Tomcat and Java? > >Hi! >Thanks for your reply! >If Java and Tomcat is multi-threaded applications, I still don't understand >why I see Java on only one CPU when I use the top function in Linux. Here >is a snapshot from a medium stress-test load: > > 15:02:23 up 1 day, 22:23, 1 user, load average: 1,79, 1,56, 0,74 >82 processes: 76 sleeping, 5 running, 1 zombie, 0 stopped >CPU states: cpu user nice system irq softirq iowait idle > total 50,0% 0,0% 7,4% 0,0% 4,6% 0,5% 37,2% > cpu00 31,9% 0,0% 8,9% 0,0% 5,9% 1,1% 51,9% > cpu01 68,1% 0,0% 5,9% 0,0% 3,3% 0,0% 22,5% >Mem: 1286812k av, 887436k used, 399376k free, 0k shrd, 162608k >buff > 462864k actv, 193060k in_d, 256k in_c >Swap: 3072216k av, 0k used, 3072216k free 392952k >cached > > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND > 745 root 25 0 98,4M 98M 7400 S 42,7 7,8 158:48 0 java > 6048 mysql 15 0 101M 101M 2576 S 0,9 8,0 1:12 1 mysqld > 6049 mysql 25 0 101M 101M 2576 R 0,6 8,0 1:49 1 mysqld >13138 root 15 0 1292 1292 904 R 0,3 0,1 0:03 0 top > 6400 mysql 25 0 101M 101M 2576 S 0,1 8,0 0:00 0 mysqld > 6410 mysql 25 0 101M 101M 2576 S 0,1 8,0 0:00 0 mysqld > 6528 mysql 25 0 101M 101M 2576 S 0,1 8,0 0:00 0 mysqld > 1 root 15 0 500 500 444 S 0,0 0,0 0:08 0 init > 2 root RT 0 0 0 0 SW 0,0 0,0 0:00 0 >migration/0 > 3 root RT 0 0 0 0 SW 0,0 0,0 0:00 1 >migration/1 > 4 root 15 0 0 0 0 SW 0,0 0,0 0:00 0 keventd > 5 root 34 19 0 0 0 SWN 0,0 0,0 0:00 0 >ksoftirqd/0 > 6 root 34 19 0 0 0 SWN 0,0 0,0 0:00 1 >ksoftirqd/1 > 9 root 25 0 0 0 0 SW 0,0 0,0 0:00 0 bdflush > 7 root 15 0 0 0 0 SW 0,0 0,0 0:02 0 kswapd > 8 root 15 0 0 0 0 SW 0,0 0,0 0:03 0 kscand > 10 root 15 0 0 0 0 SW 0,0 0,0 0:04 0 kupdated > 11 root 25 0 0 0 0 SW 0,0 0,0 0:00 0 >mdrecoveryd > 20 root 15 0 0 0 0 SW 0,0 0,0 0:01 0 kjournald > 75 root 25 0 0 0 0 SW 0,0 0,0 0:00 1 khubd > 145 root 15 0 0 0 0 SW 0,0 0,0 0:05 1 kjournald > 146 root 15 0 0 0 0 SW 0,0 0,0 0:00 0 kjournald > 147 root 15 0 0 0 0 SW 0,0 0,0 0:11 0 kjournald > 148 root 15 0 0 0 0 SW 0,0 0,0 0:02 1 kjournald > 492 root 15 0 568 568 492 S 0,0 0,0 0:00 1 syslogd > 496 root 25 0 448 448 392 S 0,0 0,0 0:00 0 klogd > 506 root 15 0 444 444 384 S 0,0 0,0 0:23 1 >irqbalance > 523 rpc 25 0 560 560 488 S 0,0 0,0 0:00 0 portmap > 542 rpcuser 25 0 716 716 636 S 0,0 0,0 0:00 0 rpc.statd > 622 root 15 0 1460 1460 1228 S 0,0 0,1 0:02 0 sshd > 636 root 25 0 792 792 684 S 0,0 0,0 0:00 1 xinetd > 646 root 15 0 488 488 408 S 0,0 0,0 0:00 0 vsftpd > 667 root 15 0 2584 2584 1892 S 0,0 0,2 0:07 0 sendmail > 676 smmsp 15 0 2260 2252 1708 S 0,0 0,1 0:00 1 sendmail > 754 root 15 0 464 464 408 S 0,0 0,0 0:00 0 gpm > 763 root 15 0 612 612 544 S 0,0 0,0 0:00 0 crond > 806 daemon 15 0 556 556 492 S 0,0 0,0 0:00 0 atd > 842 root 15 0 4972 4972 1900 S 0,0 0,3 0:07 1 >miniserv.pl > 846 root 15 0 416 416 368 S 0,0 0,0 0:00 1 mingetty > 847 root 15 0 420 420 368 S 0,0 0,0 0:00 0 mingetty > 848 root 15 0 420 420 368 S 0,0 0,0 0:00 1 mingetty > 849 root 21 0 420 420 368 S 0,0 0,0 0:00 0 mingetty > 850 root 17 0 420 420 368 S 0,0 0,0 0:00 1 mingetty > 851 root 17 0 416 416 368 S 0,0 0,0 0:00 1 mingetty > 6018 root 25 0 1128 1128 984 S 0,0 0,0 0:00 1 >mysqld_safe > 6050 mysql 20 0 101M 101M 2576 S 0,0 8,0 0:00 0 mysqld > 6051 mysql 15 0 101M 101M 2576 S 0,0 8,0 0:00 0 mysqld > 6052 mysql 15 0 101M 101M 2576 S 0,0 8,0 0:00 0 mysqld > 6053 mysql 15 0 101M 101M 2576 S 0,0 8,0 0:10 0 mysqld > 6054 mysql 15 0 101M 101M 2576 S 0,0 8,0 0:00 1 mysqld > 6055 mysql 15 0 101M 101M 2576 S 0,0 8,0 1:17 1 mysqld > 6056 mysql 15 0 101M 101M 2576 S 0,0 8,0 0:29 0 mysqld > 6057 mysql 15 0 101M 101M 2576 S 0,0 8,0 0:09 1 mysqld >13091 root 15 0 2084 2084 1716 S 0,0 0,1 0:00 1 sshd >13093 root 23 0 1336 1336 1128 S 0,0 0,1 0:00 0 bash > 6369 mysql 25 0 101M 101M 2576 S 0,0 8,0 0:00 1 mysqld > 6385 mysql 25 0 101M 101M 2576 S 0,0 8,0 0:00 1 mysqld > >As you see, there's only one Java service on CPU 0, and MySQL is running on >both CPUs. >Any explanation for this? >The web application running is a web publishing system based on web >contents stored in a MySQL database. So there's lots of SQL queries, but >fron the info above, java seems to be the bottleneck in the system. > >Any help to increase the performance is appreciated. > >Thanks >Jens Ove > > >----- Original Message ----- >From: "Peter Guyatt" <[EMAIL PROTECTED]> >To: "Tomcat Users List" <[EMAIL PROTECTED]>; "Jens Ove >Lillegraven" <[EMAIL PROTECTED]> >Sent: Wednesday, November 12, 2003 4:31 PM >Subject: RE: How to tune Tomcat and Java? > > >> Hi There >> >> sorry sent the last one before it was ready ;-) >> >> Java and Tomcat are both multi-threaded applications. So they are both >> using more than one CPU (if available). >> >> If it is using 50% of one processor then it is using 100% CPU on that >> processor, since its 50% of the actual processing capacity. >> >> Check for an infinate loop without a sleep in your code, especially if >you >> are attempting to connect a client socket to a server since linux does >not >> wait before throwing an exception. >> >> Thanks >> >> Pete >> >> -----Original Message----- >> From: Jens Ove Lillegraven [mailto:[EMAIL PROTECTED] >> Sent: 12 November 2003 15:17 >> To: [EMAIL PROTECTED] >> Subject: How to tune Tomcat and Java? >> >> >> Hi, >> >> We have a problem in that the Tomcat (java) process is the bottleneck and >is >> using only one CPU. >> There will be high load on the server when it is put online, so we are >> stress testing it offline now. Using the top command in Linux during the >> stress test, it seems that java is the bottleneck of the system. But it >uses >> not 100%, but about 45-50% of one CPU. We get no http error, the page >> performance (pages pr. second) is just getting worse as we put on more >> stress load. The max memory consumption is set to 300M, but I've never >seen >> java using more than 111M. I suppose the throughput would have increased >if >> both CPUs could be used, but is Java (Tomcat) a single processor >> application? The network throughput has a maximum average of 500kbps >> (kilo-bits) during the stress test, and should manage much more. >> Anyone who know how to make java and Tomcat performing better? >> >> Details of hardware and innstalled applications: >> Compaq ProLiant 6000, 2 x PII Xeon 400MHz, 1,3GB RAM >> Red Hat Linux Enterprise 3 ES >> J2EE: j2sdkee-1_3_1-linux >> J2SE: j2sdk-1_4_2_02-linux-i586 >> Tomcat: 4.1.24 >> MySQL: 4.0.16 >> >> Tuning Tomcat memory (done): >> in /usr/bin/dtomcat4: >> CATALINA_OPTS="-Xmx300M -Xms100M $CATALINA_OPTS $JPDA_OPTS" >> >> MySQL has been tuned, and is running very well. >> >> Thanks >> Jens Ove >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. 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