On 05/31/2011 10:54 AM, Alexander Chemeris wrote: > On Tue, May 31, 2011 at 03:07, Marcus D. Leech <mle...@ripnet.com> wrote: >> I used the following two little programs: >> <skip> >> >> And found no significant difference in peak and average latencies >> between them. >> >> The unixdomain_server takes a single command-line argument which tells >> it how many samples >> to average over before producing a printed result. >> >> So this confirms my earlier assertion that I would be surprised to find >> a significant latency difference >> between Unix-domain sockets and FIFOs, since the interior kernel >> mechanisms are broadly similar. >> Basically--some chunk of memory is copied from one place to another, >> there's some housekeeping, and >> the system-call interface is traversed a couple of times. > > Let me contradict. Maximum latency is *much* better - less then 80us > instead of 3ms. > > Data attached as usual. Tests were run with 'chrt 80 ./runtest_sh' > > PS I test on Core 2 Duo 1.6 GHz with all the GUI stuff running.
Just did both tests on my machine here, Intel Core i5 notebook. I couldn't find such a high latency (3ms). Indeed, both are performing pretty much the same. I would even say that on my box, the pipe mechanism does even better in terms of jitter. I didn't calculate mean and standard deviation but from the plot it looks like the values are closer together. Cheers, Andre _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
