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
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 s
- 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 g
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
:
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 havi
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 'per
- 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
> 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.
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 posting
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