Re: [Fkt-devel] performance issues in fxt

[Samuel Thibault]

François Trahay, le Thu 25 Aug 2011 17:40:45 +0200, a écrit :
> On Thursday 25 August 2011 17:23:23 Samuel Thibault wrote:
> > François Trahay, le Thu 25 Aug 2011 17:19:53 +0200, a écrit :
> > > Actually fxt_next_ev calls 'read' several times, leading to a large
> > > overhead. I managed to modify it so it reads 4KB blocks (reducing the
> > > number of calls to read and thus the total overhead) and the performance
> > > increases a lot: each call to fxt_next_ev now cost approx 200ns.
> > 
> > Mmm, shouldn't we be able to simply use fread & co instead of read & co?
> 
> Well, we could reduce the number of calls to read to 2,

Err, I don't see the relation with my comment.

My comment simply means: instead of reinventing buffering, why not just
using the one implemented by fread?

Samuel