Re: [Help-smalltalk] [PATCH 0/2] Some FileStream optimizations

[Holger Hans Peter Freyther]

On Wed, May 29, 2013 at 04:22:03PM +0200, Paolo Bonzini wrote:
> Il 29/05/2013 10:09, Holger Hans Peter Freyther ha scritto:
> >> > 
> >> > The testcase is simply "'foo' asFile readStream contents".
> > Yes, I did that but compared to 3.2.5/master vs. patch I don't
> > see much change in regard to the amount of fcntl. Which means
> > there was something else (which I forgot now) that we considered
> > inefficient.
> 
> It's the amount of lseek and read, not fcntl.

I remember that we saw excess.. and I didn't see a difference
as I was trying to read from /proc/cpuinfo and there is no
difference. Reading from a real file gives me a difference.


read(4, "!\n! OsmoBSC (0.9.14.182-edce) co"..., 1024) = 1024
read(4, "ty 30000\n  location_area_code 82"..., 1024) = 1024
read(4, " phys_chan_config TCH/F\n     hop"..., 1024) = 940

vs.

read(3, "!\n! OsmoBSC (0.9.14.182-edce) co"..., 2988) = 2988