Re: [Starpu-devel] Performance decreasing by adding empty tasks

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Xavier Lacoste, le Thu 16 Feb 2012 16:28:54 +0100, a écrit :
>       This is not good either, I though that as the buffer is read-only on 
> all tasks that uses it, it wouldn't cost much to manage but when I look to 
> my Gantt diagram I spend much time "PushingOutput". Why do StarPU have to 
> push that read-only buffer ?

Just for the record: it should not ever be doing that for a read-only
buffer. Unless something is perhaps keeping the spinlock of the data for
a long time for some reason. Maybe using gprof to know where most of the
cpu time is spent would help.

Samuel