Re: Thread Priority?
Re: Thread Priority?
- Subject: Re: Thread Priority?
- From: Basavaraj <email@hidden>
- Date: Fri, 21 Sep 2007 22:56:33 +0530
Hi,
I also get this problem. Apple, please suggest some solution to this
problem.
Why reading data on network sometimes take more time than usually.
In my case it is very critical, server drops video and audio packets if
client don't receive in allowed time.
Problem is more prominent in Linux and Mac OS X, but in Windows, it just
works fine.
If we launch or do some operation on some cpu intensive application or
simple X11 apps, then problem is more frequent.
Problem is not because of receiving data. I saw tcp dump on Ethereal,
actual problem is with TCP acknowledgment.
Acknowledgments are not going immediately after receiving packets.
Disabling Naggle algorithm didn't helped.
Please help any one or Apple.
Thank you for any help or suggestions.
Regards,
Basavaraj
Nelson Lee wrote:
I am currently setting the thread priority of my networking thread as
follows and it works!
int set_realtime(int period, int computation, int constraint) {
struct thread_time_constraint_policy ttcpolicy;
struct thread_time_constraint_policy ttcpolicyGet;
int ret;
ttcpolicy.period=period; // HZ/160
ttcpolicy.computation=computation; // HZ/3300;
ttcpolicy.constraint=constraint; // HZ/2200;
//ttcpolicy.preemptible=1;
ttcpolicy.preemptible=0 ;
if ((ret=thread_policy_set(mach_thread_self(),
THREAD_TIME_CONSTRAINT_POLICY, (thread_policy_t)&ttcpolicy,
THREAD_TIME_CONSTRAINT_POLICY_COUNT)) != KERN_SUCCESS) {
fprintf(stderr, "set_realtime() failed with code %d.\n",ret);
return 0;
}
return 1;
}
and the call is: set_realtime(1250000,60000,90000);
In my thread, I make a networking call using select; more
specifically, I am reading from a socket. From timing debug outputs,
the reading occurs at regular intervals (~1 ms), but occasionally, the
receive call takes 10 ms which throws off my application (it's
audio). Is this a networking issue or should setting the priority as
real-time take care of this?
Thanks,
-n
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