I was searching for threads related to reducing CPU usage in Zimbra 8 and ran into this post about reducing memory usage. Not sure how much it reduces CPU usage, but I haven’t had any warnings from my VPS provider since implementing these changes.

zmcontrol stop

zmlocalconfig -e tomcat_java_heap_memory_percent=40
 zmlocalconfig -e mysql_memory_percent=10
 zmlocalconfig -e mysql_table_cache=250
 zmlocalconfig -e mailboxd_java_heap_memory_percent=10
 zmlocalconfig -e zmmtaconfig_interval=7200
zmlocalconfig -e zmmtaconfig_interval=600 
zmprov mcf zimbraLogRawLifetime 7d 
zmprov mcf zimbraLogSummaryLifetime 30d 

Edit /opt/zimbra/conf/my.cnf

threadcache = 20
 maxconnections = 20

$max_servers = 10;
 to:
 $max_servers = 2;

Login into Zimbra account, update crontab entries

Change */2 * * * * /opt/zimbra/libexec/zmstatuslog to
 */60 * * * * /opt/zimbra/libexec/zmstatuslog 

change 00,10,20,30,40,50 * * * * /opt/zimbra/libexec/zmlogprocess to
 */15 * * * * /opt/zimbra/libexec/zmlogprocess

zmcontrol start

If the above still doesn’t work, you can disable the logger service.

zmprov ms <hostname> -zimbraServiceEnabled logger 

and to check for enabled services

zmprov gs <hostname> | grep zimbraServiceEnabled 

Reference:

• Vwiki
• Rob