In message: [EMAIL PROTECTED]
M. L. Dodson [EMAIL PROTECTED] writes:
: On a computational chemistry list I subscribe to there is a
: current thread about multi-cpu systems needing to have the cpu
: frequencies synced (this is in a Linux context). This is
: evidently not just having
M. Warner Losh wrote:
In message: [EMAIL PROTECTED]
M. L. Dodson [EMAIL PROTECTED] writes:
: On a computational chemistry list I subscribe to there is a
: current thread about multi-cpu systems needing to have the cpu
: frequencies synced (this is in a Linux context). This is
:
- Original Message
From: Stephen Montgomery-Smith [EMAIL PROTECTED]
...snip snip...
The other thing I have noticed is that when I split jobs using threads
so that I can use several processors, the speed up to the program is far
less than one might expect - indeed sometimes it even
On Saturday 16 December 2006 12:30, M. Warner Losh wrote:
In message: [EMAIL PROTECTED]
M. L. Dodson [EMAIL PROTECTED] writes:
: On a computational chemistry list I subscribe to there is a
: current thread about multi-cpu systems needing to have the cpu
: frequencies synced (this
The TSCs for each individual cpu core can drift relative to each other,
even on multi-core chips like AMD X2s. This only effects code which
uses the TSC, which isn't a whole lot. They need to be synchronized
with each other (by calculating the drift and correcting for it) when
- Original Message
On a computational chemistry list I subscribe to there is a
current thread about multi-cpu systems needing to have the cpu
frequencies synced (this is in a Linux context). This is
evidently not just having the cpus running at nominally the same
frequency but
frequency but something else in addition. A posting in the
thread said variations less than 0.1% were not problematic.
However, the poster said it was an issue in a dual cpu, dual
core system he had set up.
Why would application code care about CPU frequencies?
Is it trying to measure its
On a computational chemistry list I subscribe to there is a
current thread about multi-cpu systems needing to have the cpu
frequencies synced (this is in a Linux context). This is
evidently not just having the cpus running at nominally the same
frequency but something else in addition. A
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