On Wed, 17.10.07 16:37, Deb Briggs (Deb.Briggs at palm.com) wrote: > http://www.kernel.org/doc/ols/2007/ols2007v2-pages-145-150.pdf says that > local clients can exchange audio data with a local PulseAudio daemon > through shared memory IPC - is there any example code that shows > this? This is not directly exposed in the API. You can see it in a way if you use "strace". > Asking because we're seeing quite high CPU usage (30%+) when using > memcpy in the read callback that we install via > pa_stream_set_read_callback. This might have different reasons. Small block sizes. Resampling on slow CPUs and so on. Only a valgrind/gprof/sprof could bring light into what's slowing PA down that much. Please note that SHM is not magic wand to lower your CPU load (memcpy is pretty fast these days). It's more one that decreases the pressure on the CPU cache, lowers memory consumption, and lowers latency (a bit). Don't expect wonders from it, especially not in when it comes to total CPU utilization. Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4
