java process %CPU up to 2xx%?

[tiger2000]

Dear All,

just curious is this behavior normal?
this is a multi-core server (total 16-core), and sometimes we found the java process (jetty) runs up to 250% CPU% in "top" listing, just like below :

top - 16:03:58 up 81 days,  3:52,  4 users,  load average: 1.78, 2.73, 3.56
Tasks: 326 total,   1 running, 325 sleeping,   0 stopped,   0 zombie
Cpu(s): 13.0%us,  1.1%sy,  0.0%ni, 85.8%id,  0.0%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:  12296764k total, 11419060k used,   877704k free,   383992k buffers
Swap: 25165812k total,      312k used, 25165500k free,  3701628k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
 6228 zimbra    15   0 5976m 5.2g  16m S 222.5 44.7  18852:56 java

the java process is for jetty server :

zimbra    6228  6227 17 Jan28 ?        13-02:15:32 /opt/zimbra/java/bin/java -server -Djava.awt.headless=true -XX:+UseConcMarkSweepGC -XX:NewRatio=2 -XX:PermSize=128m -XX:MaxPermSize=128m -XX:SoftRefLRUPolicyMSPerMB=1 -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime -Xss256k -Xms4803m -Xmx4803m -Xmn1200m -Djava.io.tmpdir=/opt/zimbra/mailboxd/work -Djava.library.path=/opt/zimbra/lib -Djava.endorsed.dirs=/opt/zimbra/mailboxd/common/endorsed -Dzimbra.config=/opt/zimbra/conf/localconfig.xml -Djetty.home=/opt/zimbra/mailboxd -DSTART=/opt/zimbra/mailboxd/etc/start.config -jar /opt/zimbra/mailboxd/start.jar /opt/zimbra/mailboxd/etc/jetty.properties /opt/zimbra/mailboxd/etc/jetty-setuid.xml /opt/zimbra/mailboxd/etc/jetty.xml

I think it just means that this process almost consume almost 3 CPU cores for job processing, and we still have lots of space (total 16-core) for other processes. is my understanding correct?

any advice? Thanks.

[jlee1987]

I'm having the exact same issue, on a Dual Intel(R) Xeon(TM) CPU 3.20GHz server. Did you find out what was causing your issue?

Details on my setup:

Dual Intel(R) Xeon(TM) CPU 3.20GHz

At the time I saw this issue, we had about 6 or so web clients, in total we have aprox 520 users on this server.

top - 09:50:14 up 1 day, 19:20,  2 users,  load average: 1.85, 1.20, 1.07
Tasks: 165 total,   1 running, 163 sleeping,   0 stopped,   1 zombie
Cpu(s): 73.7%us,  9.0%sy,  0.0%ni, 17.3%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   6048336k total,  4435488k used,  1612848k free,   162660k buffers
Swap:  8093688k total,        0k used,  8093688k free,   574764k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
25112 zimbra    18   0  616m  72m  10m S 245.1  1.2   0:04.62 java

[root@postboxn ~]# free
             total       used       free     shared    buffers     cached
Mem:       6048348    3917852    2130496          0     210208    1602604
-/+ buffers/cache:    2105040    3943308
Swap:      8093688        104    8093584