Le Samedi 9 Mars 2002 12:44, _-¯-_ a écrit :

hi

does anyone have experience with pd running on a dual system?

yes,

basically, if i just start 1 pd normally, will it be using both cpus transparently?

Yes and no. PD can have some multithreaded objects and externals but there are only 2 of them available (readsf~ and writesf~).

In the real life you have to run 2 PD if you want to share the processing power.

BTW, you can use the csound~ object, each object launchs an independant csound task.

pd -> loadmeter said: ~100% top says pd ~50%

from my experience with dual machines so far, top should actually go up to 200% with 2 cpus on full load?

200% if you sum up all the listed threads. 100% for the maximum load of a given task using all of the power of one cpu.

The PD loadmeter and top should say the same thing. Probably the update time is too slow ? You can lower it in top hitting "s".

then there's the mosix setup, which requires some kernel patching and brings in the 'runon' command, but all the info i could get seems really outdated and applying only for up to 2.2 kernels, e.g. the SMP-HOWTO on linuxdoc.org seems really not up to date ..

any hints ?

A 2.4 low latency kernel is probably a good start, but even without you can run 2 PD without too much trouble, unless you need read/writing to disc.

Linium