Whoa folks The concurrent low pause collector: this collector is used if the -Xincgc is passed he concurrent collector is used to collect the tenured generation and does most of the collection concurrently with the execution of the application. The application is paused for short periods during the collection. A parallel version of the young generation copying collector is used with the concurrent collector. The concurrent low pause collector is used if the option -XX:+UseConcMarkSweepGC is passed on the command line. please check out http://www.oracle.com/technetwork/java/gc-tuning-5-138395.html#0.0.0.Performance%20Considerations|outline really be worth your time. I have sucessfulky on the z with websphere and linux implemented GC - as any utility that interacts with applications one must KNOW the application. Heap sizes etc.
Richard (Gaz) Gasiorowski Solution Architect CSC 3170 Fairview Park Dr., Falls Church, VA 22042 845-889-8533|Work|845-392-7889 Cell|[email protected]|www.csc.com This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. From: Alan Cox <[email protected]> To: [email protected] Date: 04/25/2011 04:39 PM Subject: Re: multipl cpu's > One of the problems with Java Garbage Collection is that it halts > other work in the JVM for the duration of the GC (because you're > moving stuff around, you can't have people trying to use it). While GC > has improved over time to reduce the amount of objects handled during > each scan, my understanding is that it still suspends other JVM work. > Part of GC can exploit additional CPUs when you activate the parallel > GC (not the default). Thats an implementation flaw (maybe flaw is a strong word given its a hard problem). Schoeberl and Puffitsch for one produced a mostly non blocking garbage collection for Java which only blocks the threads it needs and only at the points it has to. Rather useful for multi-threaded systems. Alan ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
