RE: VMs

I saw JRockit at JavaOne and was just as surprised as you are. I will be
experimenting with it, but not for a month or so. Apparently they said there
are some JVM changes for 1.4 and that their 1.4 implementation will be out
this summer. Regarding performance, they said they could handle considerably
more threads on Linux than the Sun or IBM JVM.

That said, I also talked with the Sun JVM guys in one of the BOFs. One of
the Linux guys in that BOF said that kernel 2.4.19 has a completely new
threading model (looks like Alan inserted the IBM NGPT lib -
http://www-124.ibm.com/developerworks/oss/pthreads/ in). The Sun guys didn't
commit to supporting it - complaining they had enough Linux
distributions/kernels to support, but they are very keen on performance and
their lack of commitment wasn't "no". I got the impression they might wait
until one of the major distributions (like Redhat) ships with this kernel.
It would require recompilation of the JVM. Their plans are for maintenance
releases every three months (1.4_01, 1.4_02) followed by 1.4.1 in the fall.
Hopefully it will make into at least the 1.4.1 release.

Eric

Eric Brown
2Wire.Inc
Server Engineering Manager
p. 408.503.1060

Want to share your DSL or cable connection with all the computers in your
house? Check out 2Wire's HomePortal at http://www.2wire.com/products.

> -----Original Message-----
> From: Hoeller Juergen [mailto:juergen.hoeller@xxx.com]
> Sent: Thursday, April 04, 2002 1:09 AM
> To: resin-interest@xxx.com
> Subject: VMs
>
> Recently, BEA acquired Appeal Virtual Machines and their server VM
> JRockit (http://www.jrockit.com) and obviously changed the licensing:
>
> <quote>As of the aquisition, the JRockit Virtual Machine is available
> for free! Now everyone can benefit from superior Java performance on
> Intel platforms.</quote>
>
> So if this means that everyone can use the JRockit VM as a free
> alternative, I wonder whether anyone has experiences with it and its
> speed and stability. They claim to have optimized it for server usage,
> so there should be advantages to the "standard" VMs.
>
> To the best of my knowledge, there are currently the following relevant
> J2SE VMs for Windows and Linux, all of them free of charge:
> - Sun HotSpot Client VM 1.3.1/1.4: Windows, Linux;
> - Sun HotSpot Server VM 1.3.1/1.4: Windows, Linux;
> - IBM VM 1.3.0: Windows, Linux;
> - Blackdown VM 1.3.1: Linux;
> - JRockit VM 3.1 (implementing J2SE 1.3): Windows, Linux.
>
> Appeal claim to beat the IBM VM in terms of SPECjbb2000 results. Is
> there anyone who runs Resin on JRockit and has compared it to other VMs?
> Besides, anyone having performance comparisons between the Sun VMs and
> the IBM VM on the same machine?
>
> Regards,
> Juergen
>
> ----------------------------------------
> Juergen Hoeller
> Senior Software Engineer
> mailto:juergen.hoeller@xxx.com
>
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Received on Thu 04 Apr 2002 14:55:05 -0800