On Sat, 2006-12-16 at 16:21 +0100, Patco wrote: > IOhannes m zmoelnig a écrit : > > Hans-Christoph Steiner wrote: > > > >> Apple puts good audio hardware in their laptops. I can get 14ms of > >> latency on Mac OS X with Pd without really trying (I just set it to > >> 14ms). I can get down to 11ms if I don't mind clicks when I > operate the > >> menus and switch to other applications. > >> > > > > as always when it comes to latency and people tell numbers, i have > to > > ask my question: have you measured this? how? or was it just > "putting a > > number somewhere and assuming that it's the real latency"? > > how much load do your settings allow?
from my experience, pd's audio backend is the bigger latency problem than the audio hardware, especially on osx/windows, where vanilla pd is using portaudio with pablio, which is unable to get below around 25 ms of round-trip latency (i guess, hans was referring to one-way latencies) > hello, the lowest latency i could get is with the CCRMA low latency > kernel patch. > On a cheap internal audio card and an USB midi sport 2*2, > connecting midi in to midi out gives me a latency measure on [timer] > between 15 and 25 ms with the lowest affordable buffers (about 5ms) > as on linux, it's a bit better, but even with wini's alsa implementation, the least round-trip latency it can produce without audio dropouts is around 10ms. using it with smaller buffersizes there are severe timing problems. with the callback-driven scheduler and the portaudio implementation from devel, it's possible to get below 5 ms on all supported platforms, though. as for linux, it probably doesn't make any sense to use the rt kernel patches with vanilla pd, as it's internal bottlenecks are a bigger problem than the kernel. and of course, these numbers are without _any_ gui interaction. hth, tim -- [EMAIL PROTECTED] ICQ: 96771783 http://www.mokabar.tk I must say I find television very educational. The minute somebody turns it on, I go to the library and read a good book. Groucho Marx
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