On 7/26/07, McEase <[EMAIL PROTECTED]> wrote:
Hi Geoff, Thank you! Following is my JDK version and OS version. $ java -version java version "1.5.0_10" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03) Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_10-b03, mixed mode) $ uname -a Linux ....... 2.6.18-4-amd64 #1 SMP Fri May 4 00:37:33 UTC 2007 x86_64 GNU/Linux I will try your method and report again. I should use following command to run my program, right? $ java -Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.EPollSelectorProvider ... Geoff Cadien wrote: > > On 7/25/07, McEase <[EMAIL PROTECTED]> wrote: >> >> >> Hi all, >> >> I have a server program based on mina which provides services to clients >> and >> also acts as a client of other servers. I found that when there're lots >> of >> client come and request a service and go (at a moment, there aren't so >> many >> clients), the CPU load of my program is very high. I profiled my program >> through java's agentlib hprof, like this: > > > First let me say that I'm new to MINA myself so take what I have to say > with > a grain of salt. A high cpu load isn't always a bad thing, especially > since > you mention you see a high load with lots of clients. > > > $ java -agentlib:hprof=cpu=samples,depth=8 -cp $MyClassPath MyClass >> >> I got the following results: >> >> ...................... >> TRACE 300291: >> sun.nio.ch.PollArrayWrapper.poll0(PollArrayWrapper.java:Unknown >> line) >> sun.nio.ch.PollArrayWrapper.poll(PollArrayWrapper.java:100) > > > > What JDK version/OS are you using? I ask because at least on Linux, jdk > 1.6 uses epoll and not poll. A later update of jdk 1.5 can also use epoll > but you have to set the SelectorProvider using a System property. If you > are using Linux epoll is much more efficient and might decrease your cpu > load.
I think you need to upgrade your JDK to 1.5 update 12 because update 10 doesn't contain epoll provider AFAIK. Trustin -- what we call human nature is actually human habit -- http://gleamynode.net/ -- PGP Key ID: 0x0255ECA6
