Paul Eggert <egg...@cs.ucla.edu> wrote:
> On 03/27/2017 07:02 AM, Carlo Alberto Ferraris wrote:
> > This is a PoC patch that improves archive creation performance at least in
> > certain configurations
>
> What configuration performs poorly with sequential access? How much
> improvement do you see with the patch, and why?
I doubt that such methods will help to speed up archiving. I did many tests
with similar approaches with star since aprox. 1997 and I did never see any
performance win on any modern OS.
There was one single OS where it helped to use unbufferede I/O: DG/UX.
I used O_DG_UNBUFFERED and a special selr written read function that could help
to speed up star dramatically - but only on DG/UX.
Jörg
--
EMail:jo...@schily.net (home) Jörg Schilling D-13353 Berlin
joerg.schill...@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
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