Date: Thu, 30 Oct 2008 09:34:22 +0200 From: Krassimir Slavchev <krassi@bulinfo.net> To: Jason Stone <freebsd-performance@dfmm.org> Cc: freebsd-performance@freebsd.org Subject: Re: thread switching time? Message-ID: <4909637E.3030802@bulinfo.net> In-Reply-To: <alpine.BSF.1.00.0810291034470.23737@treehorn.dfmm.org> References: <49088124.9050809@bulinfo.net> <alpine.BSF.1.00.0810291034470.23737@treehorn.dfmm.org>
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Jason Stone wrote:
>
>> I am using FreeBSD 7 and would like to decrease the time of switching
>> between threads. This time seems to be 1ms and it is impossible to
>> make lower delays inside a thread, at least using nanosleep().
>
>> Is it possible to decrease this time to 1us?
>
> Increase HZ, with the usual caveats about trading off latency for overhead?
>
>
> -Jason
>
I have:
kern.clockrate: { hz = 4000, tick = 250, profhz = 4000, stathz = 129 }
but no difference.
Yes, overheads are lower and my application's performance is better but
thread switching time is same.
AFAIR I have read somewhere on the Internet about such problem when
playing multiple video files and the solution was to change some
parameters somewhere in header files but I cannot find this again.
Best Regards
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