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SubjectRe: Possible spin-problem in nanosleep()
On Thu, 23 Jun 2005, Andreas Schwab wrote:

> "Richard B. Johnson" <linux-os@analogic.com> writes:
>
>> nanosleep() appears to have a problem. It may be just an
>> 'accounting' problem, but it isn't pretty. Code that used
>> to use usleep() to spend most of it's time sleeping, used
>> little or no CPU time as shown by `top`. The same code,
>> converted to nanosleep() appears to spend a lot of CPU
>> cycles spinning. The result is that `top` or similar
>> programs show lots of wasted CPU time.
>
> usleep() is just a wrapper around nanosleep(). Are you sure you got the
> units right?
>
> Andreas.
>

Yeah nano is -9 micro is -6, three more zeros when using nano.
I note that the actual syscall is __NR_nanosleep = 162. I don't
understand the discrepancy either.

> --
> Andreas Schwab, SuSE Labs, schwab@suse.de
> SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
> Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
> "And now for something completely different."
>

Cheers,
Dick Johnson
Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips).
Notice : All mail here is now cached for review by Dictator Bush.
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