JRockit vs Sun JDK

[Vinod Panicker <vi...@gmail.com>]

Hi,

I ran my usual load test on JDK 6 and JRockit 5 and was surprised to
see that JRockit did extremely poorly as compared to the Sun JVM.

In terms of CPU utilization, for a user load of 10k, the Sun JVM used
up 45% cpu while the JRockit JVM used over 80% at just 6k users. The
response time degraded so badly by then that it was pointless to run
the test further.

After reading about Robert's experiences with JRockit, I was expecting
great things, but this turned out to be quite a surprise.

Regards,
Vinod.

Re: JRockit vs Sun JDK

[Emmanuel Lecharny <el...@gmail.com>]

I have no idea if IBM support epoll.

What I can tell is that when we did some performance tests on ADS last
summer, we did it with Sun jdk 1.5, IBM and JRockit, and JRockit outperfomed
Sun by a large margin (like 40%), and IBM by 10%.

Things could have changed since... Obviously, there were space for huge
optimization in Sun JVM ;)

On 12/13/06, Vinod Panicker <vi...@gmail.com> wrote:
>
> On 12/13/06, Robert Greig <ro...@gmail.com> wrote:
> > On 13/12/06, Emmanuel Lecharny <el...@gmail.com> wrote:
> >
> > > > In terms of CPU utilization, for a user load of 10k, the Sun JVM
> used
> > > > up 45% cpu while the JRockit JVM used over 80% at just 6k users. The
> > > > response time degraded so badly by then that it was pointless to run
> > > > the test further.
> > > >
> > > > After reading about Robert's experiences with JRockit, I was
> expecting
> > > > great things, but this turned out to be quite a surprise.
> >
> > We found that Sun JDK 6 outperformed JRockit 5 by a reasonable margin,
> > but that if you compare JRockit 5 to Sun 5, JRockit was on top.
> > However at the time we tested that Sun 1.5 did not have epoll support.
> > I am not sure if JRockit 5 has epoll support. Lack of epoll could well
> > be the reason for high CPU utilisation with that number of clients.
>
> That's a relief!  I am assuming that JRockit has epoll support as
> well.  But I haven't confirmed it as yet.  Of course, it doesn't make
> sense to test lots of connections on anything that doesn't have epoll
> support.
>
> Emmanuel, do you know if the IBM JDK has epoll support?  I'd be happy
> to run a test if it does.
>
> Regards,
> Vinod.
>



-- 
Cordialement,
Emmanuel Lécharny
www.iktek.com

Re: JRockit vs Sun JDK

[Vinod Panicker <vi...@gmail.com>]

On 12/13/06, Robert Greig <ro...@gmail.com> wrote:
> On 13/12/06, Emmanuel Lecharny <el...@gmail.com> wrote:
>
> > > In terms of CPU utilization, for a user load of 10k, the Sun JVM used
> > > up 45% cpu while the JRockit JVM used over 80% at just 6k users. The
> > > response time degraded so badly by then that it was pointless to run
> > > the test further.
> > >
> > > After reading about Robert's experiences with JRockit, I was expecting
> > > great things, but this turned out to be quite a surprise.
>
> We found that Sun JDK 6 outperformed JRockit 5 by a reasonable margin,
> but that if you compare JRockit 5 to Sun 5, JRockit was on top.
> However at the time we tested that Sun 1.5 did not have epoll support.
> I am not sure if JRockit 5 has epoll support. Lack of epoll could well
> be the reason for high CPU utilisation with that number of clients.

That's a relief!  I am assuming that JRockit has epoll support as
well.  But I haven't confirmed it as yet.  Of course, it doesn't make
sense to test lots of connections on anything that doesn't have epoll
support.

Emmanuel, do you know if the IBM JDK has epoll support?  I'd be happy
to run a test if it does.

Regards,
Vinod.

Re: JRockit vs Sun JDK

[Robert Greig <ro...@gmail.com>]

On 13/12/06, Emmanuel Lecharny <el...@gmail.com> wrote:

> > In terms of CPU utilization, for a user load of 10k, the Sun JVM used
> > up 45% cpu while the JRockit JVM used over 80% at just 6k users. The
> > response time degraded so badly by then that it was pointless to run
> > the test further.
> >
> > After reading about Robert's experiences with JRockit, I was expecting
> > great things, but this turned out to be quite a surprise.

We found that Sun JDK 6 outperformed JRockit 5 by a reasonable margin,
but that if you compare JRockit 5 to Sun 5, JRockit was on top.
However at the time we tested that Sun 1.5 did not have epoll support.
I am not sure if JRockit 5 has epoll support. Lack of epoll could well
be the reason for high CPU utilisation with that number of clients.

RG

Re: JRockit vs Sun JDK

[Emmanuel Lecharny <el...@gmail.com>]

Interesting...

What about IBM JVM ?

Emmanuel

On 12/13/06, Vinod Panicker <vi...@gmail.com> wrote:
>
> Hi,
>
> I ran my usual load test on JDK 6 and JRockit 5 and was surprised to
> see that JRockit did extremely poorly as compared to the Sun JVM.
>
> In terms of CPU utilization, for a user load of 10k, the Sun JVM used
> up 45% cpu while the JRockit JVM used over 80% at just 6k users. The
> response time degraded so badly by then that it was pointless to run
> the test further.
>
> After reading about Robert's experiences with JRockit, I was expecting
> great things, but this turned out to be quite a surprise.
>
> Regards,
> Vinod.
>



-- 
Cordialement,
Emmanuel Lécharny
www.iktek.com