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Re: Kernel Timeslice



>> > Steve West wrote:
>> >> I am running Fedora 9 x86 64 bit. What is the kernel timetick per
>> >> thread? How many threads per second does the kernel run?
>> > Probably not quite what you are asking but here goes:
>> > http://kerneltrap.org/node/464
>> >
>> > run for a few seconds:
>> > $ vmstat 1
>> >
>> > look at system|in = interrupts per second.
>> > this is approximately the interupts per second or timer Hz value.
>> >
>> > from the kernel config parameter HZ_1000 etc:
>> > getconf CLK_TCK
>> >
>> > DaveT.
>> Is there ay way to set the ticks without rebuilding the kernel?
>
> Perhaps if you explained what you are trying to achieve people might be
> able to help you get there.
>
> poc
I have an application/service that has 1000 or so threads. Most of these are TCPIP socket accept and connect. I want to be able to run all the threads in a second or so to achieve a reasonable throughput. I would like the kernel
to run 1000 threads per second. Right now I think it is set for 100 ticks
per second in f9 x86 64bit.

The ticks matter when the threads are competing for cpu, but it looks
like in your case they'll mostly be waiting for socket calls (during
which the schedular will hand off to another thread anyway), so
increasing the timeslice frequency is probably not going to make a
difference. Hard to know without testing of course.

poc
Yes you are correct under "NORMAL" circumstances 100 ticks per second
would be ok. But if I design for worst case where all threads are running
I need 1000 ticks per second, or response will not be good. I did not want
to build a custom kernel, but it looks like I may have to to achieve the
design goal.

Steve

Steve
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