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On Tuesday 19 June 2007 13:36:52 Miller, Douglas K. CONT NAVAIR 2109, 1, N1=
39=20
wrote:
> I have found that that KParts supports multi threading, but when you use
> a machine with multiple cores (hyper threading) the application crashes.

1) Hyper threading is exposing a single core AS IF it were two cores,=20
resulting in a slightly smaller performance hit when a pipeline has to be=20
flushed but not actually providing simultaneous execution for multiple=20
instructions.  Having two cores is vastly more powerful.

2) I've been running KParts on a 4-core NUMA machine for nearly 2 years now=
=20
with no such crashes.  I suggest you investigate the problem more thoroughl=
y=20
AND make sure whatever KPart you are experiencing issues with is written in=
 a=20
thread-safe manner.

3) Thread support in a library means that it is *possible* to use that libr=
ary=20
from multiple threads, not that every application that works with one threa=
d=20
will work with more -- because there are probably a number of ways to use t=
he=20
library in a thread-unsafe manner.  In particular, Qt has many objects that=
=20
cannot be safely shared across threads without external locking.

=2D-=20
Boyd Stephen Smith Jr.                     ,=3D ,-_-. =3D.=20
bss03@volumehost.net                      ((_/)o o(\_))
ICQ: 514984 YM/AIM: DaTwinkDaddy           `-'(. .)`-'=20
http://iguanasuicide.org/                      \_/    =20

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