Re: Bad MIDI performance : 10ms latency instead of the expected 1-1.5ms

Brian Perkins (bperkins@netspace.org)
Thu, 26 Aug 1999 14:38:27 -0400

Sounds like you're running into context switch time overhead, since
I've seen similar things when trying to sleep less than 10 ms on a
pentium 200 (i.e. you can't unless it's a busy sleep).

Your test will probably fail no matter what you do. I'd bet you'll
get a similar value if you do

time1=gettime()
syscall()
syscall()
time2=gettime()

where syscall is some sort of syscall that requires little time to
complete ( like nanosleep for 1 nanosecond).

How to improve this sort of depends on what you're trying to do.

--
Throb always without you and the throb always within.  
			      --James Joyce, "Ulysses"
Brian Perkins                               bperkins@netspace.org




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