Re: [gentoo-user] Re: [OT] fast recursive local copy

[Joerg.Schilling@fokus.fraunhofer.de (Joerg Schilling)]

Dirk Heinrichs <dirk.heinrichs@online.de> wrote:

> Am Freitag 14 August 2009 10:50:45 schrieb Joerg Schilling:
>
> > Note that on Linux you may need to add "-no-fsync" because file I/O is slow
> > on Linux. On Solaris, not using -no-fsync slows things down by aprox. 10%
> > but allows star to grant that everything was really copied to stable
> > storage. On Linux, ot using -no-fsync slows things down by aprox. 400%,
> > this is why I recommend to add "-no-fsync".
>
> This is also quite interesting. Do you have some (links to) recent benchmarks 
> which would second that? Could this even be depending on the filesystem used on 
> Linux?

I did this test aprox. 3-4 years ago. You may try to do an own test and report.

I did just rerun a test on a recent ubuntu in a VirtualBox environment and the 
speedup factor with -no-fsync was 8x.

Jörg

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