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From Oleg Kalnichevski <o.kalnichev...@dplanet.ch>
Subject Re: HttpClient and CPU usage.....
Date Wed, 26 Mar 2003 18:08:53 GMT
Busy wait has been fixed after 2.0a3 release. So, a recent nightly build
is needed. Besides, it turned out that Ken was using a rather old JDK
(1.2) which is known to have rather lousy JIT on Solaris platform. I
have already recommended Ken to upgrade both the JDK and the HttpClient

Cheers

Oleg

On Wed, 2003-03-26 at 17:10, Tom Samplonius wrote:
>   What version of httpclient are you using?
> 
>   I understand that a busy read loop was removed from httpclient a couple
> of weeks ago.  I'm not sure if this change was made for Alpha3, or whether
> you have to go the daily builds to get it.
> 
> Tom
> 
> 
> On Wed, 26 Mar 2003, Ken Clark wrote:
> 
> > I've built a b2b application using the commons HttpClient, and all works
> > extremely well.  The problem is, however, that the app is using up to 45% of
> > the CPU time ( as reported by various unix processes ( ps -aux, vmstat,
> > etc ) ).  The customer has a Sun 4500, running solaris, with two processors.
> > 
> > I've tried debugging the app's CPU usage using the -Xrunhprof:cpu=samples
> > parameter in the VM, and it returns the "hot spots" for CPU usage :
> > 
> >    1 74.67% 74.67% java/net/SocketInputStream.read      ([BII)I
> >    2  9.61% 84.28% java/net/PlainSocketImpl.available   ()I
> >    3  8.51% 92.79% java/net/PlainSocketImpl.doConnect
> > (Ljava/net/InetAddress;I)V
> > 
> > everything else is using less than 0.50% of the VMs CPU.
> > 
> > Since I'm not using these classes directly, I'm assuming that HttpClient is.
> > How can I make my app use less of the CPU?
> > 
> > 
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> > 
> > 
> > 
> 
> 
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