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From Paul Richards <Paul.Richa...@Sun.COM>
Subject RE: IBM Java VS SUN Java
Date Thu, 15 Apr 2004 17:18:59 GMT
Does your linux box have a kernel capable of utilising hyper-threading? 
I think only the very new 2.6 kernels can utilise it..



On Tue, 2004-04-13 at 12:55, Nicholas Bernstein wrote:
> yes, dual hyper-threaded xeons. 
> 
> On Mon, 2004-04-12 at 12:02, Shapira, Yoav wrote:
> > Hi,
> > Was the linux box hyper-threaded?
> > 
> > Yoav Shapira
> > Millennium Research Informatics
> > 
> > 
> > >-----Original Message-----
> > >From: Nicholas Bernstein [mailto:nick@docmagic.com]
> > >Sent: Monday, April 12, 2004 2:50 PM
> > >To: Tomcat Users List
> > >Subject: IBM Java VS SUN Java
> > >
> > >Recently, we've been doing some load testing of apache (1.3.x) w/
> > tomcat
> > >4.1.29 & 5.0.19 and were surprised at how slow it was responding on our
> > >redhat linux testbed system. We did some comparisons to a Win2k tomcat
> > >server, and the Win2k server *BLEW* it out of the water in terms of
> > >speed and load limits. After some mucking around, we narrowed down the
> > >difference to the java implementation. We switched over from sun's java
> > >jdk1.4.2_04 to IBMJava2-141 and saw some speed improvements and huge
> > >differences in load limits, i.e. it could scale much higher.
> > >
> > >I was wondering if anyone had experienced any problems due to switching
> > >to IBM's java, and if so what they were. Also, if anyone has any hints,
> > >links, or general advice on how to speed things up, be it tomcat
> > tuning,
> > >or java, it would be very appreciated. The windows box, while not able
> > >to scale as well, does generally respond in 1/4 the time of the linux
> > >box.
> > >
> > >Thanks in Advance, any advice is appreciated.
> > >
> > >--
> > >+---------------------------------------------------------------+
> > >| Nicholas Bernstein            | nick@docmagic.com             |
> > >| UNIX Systems Administrator    | http://www.docmagic.com       |
> > >| Document Systems Inc.         |  				|
> > >| gpg: F706 8C4E 78FA DDDD 53A0 019F D983 FE28 2002 D1F3	|
> > >+---------------------------------------------------------------+
> > >
> > >
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> > 
> > 
> > 
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-- 
Paul Richards <Paul.Richards@Sun.COM>


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