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From: Peter Crowther <Peter.Crowther@melandra.com>
To: 'Tomcat Users List' <users@tomcat.apache.org>
Date: Fri, 20 Feb 2009 13:03:22 +0000
Subject: RE: very slow class loading on initial JSP/servlet request after
 restart
Thread-Topic: very slow class loading on initial JSP/servlet request after
 restart
Thread-Index: AcmTWMEm36fmIiAuSaaRN3KL/BWckgAAZlgg
Message-ID: <6715CF65287F8F408DA109EC03AC6C0D845D92FC5E@puma.melandra.net>
References: <499DEA05.4040501@ims.net>
 <0AAE5AB84B013E45A7B61CB66943C17215B8312648@USEA-EXCH7.na.uis.unisys.com>
 <499EA3FB.4030407@ice-sa.com>
In-Reply-To: <499EA3FB.4030407@ice-sa.com>
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> From: Andr=E9 Warnier [mailto:aw@ice-sa.com]
> >> From: Sam Hokin [mailto:sam@ims.net]
> >> The server that's being a problem is a Dell PowerEdge
> >> 1950, quad dual core.

> Since we have 4 processors here (do we, really? I am not so familiar
> with the multi-core architecture), can each of these processors be
> running a thread of these apps/classes, where on a single processor
> there would be only one thread running ?

Quad dual-core*.  That's 4 silicon dies, each with two copies of "the core =
of" a CPU.  So (4 * 2) =3D 8 separate instruction execution units, 8 progra=
m counters, executing up to 8 instruction streams in parallel.

The cores on one die share some infrastructure like cache and memory access=
, but the interesting feature here is that this machine can run 8 threads c=
oncurrently.

                - Peter

* Says the original poster.  Looking at the Dell site, I reckon it's actual=
ly dual quad-core - so two dies, 4 cores per die.  Still 8 concurrent threa=
ds, though.

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