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Re: which program can test cpu speed

On Fri, Oct 26, 2018 at 05:34:26PM +0300, Reco wrote:
On Fri, Oct 26, 2018 at 09:59:16AM -0400, Michael Stone wrote:
On Fri, Oct 26, 2018 at 08:57:29AM +0300, Reco wrote:
> Why would you need a *program* to do that then you have Linux kernel
> already?
> grep bogomips /proc/cpuinfo

Anyone reading that advice: ignore it. You cannot use bogomips to meaningfully compare processors.

The reason being?

As it says in the link you posted, "It is not usable for performance comparisons among different CPUs".

The kernel uses it just fine for the clock calibration.

I suppose if you want to use the system exclusively for busy loops, you can use the bogomips number to see which cpu will wait the fastest and choose based on that.

FWIW, even the kernel doesn't use naive busy loops anymore on newer hardware. (TSC or MWAIT is used, depending on what the processor supports.)

Mike Stone