Re: CVS commit: src/bin/cp

[Matthias Scheler <tron%NetBSD.org@localhost>]

On Tue, Oct 26, 2010 at 05:05:28AM +1100, matthew green wrote:
> 
> > On Mon, Oct 25, 2010 at 08:52:43AM +0100, Matthias Scheler wrote:
> > > On Sun, Oct 24, 2010 at 10:56:40PM +0000, David Holland wrote:
> > > > Anyway, ISTM that writing from the mmap buffer in say 64K chunks would
> > > > retain nearly all the advantages and get rid of the latency problem.
> > > 
> > > The way the code is currently written it only uses mmap(2) for
> > > files smaller than 8MB anyway. Your suggested change would require
> > > more work than reducing the size of the mapped memory.
> > 
> > Forget that, I misunderstood what you said. We can still use one
> > mmap(2) but should write out that memory with multile write(2)
> > system calls.
> 
> FWIW, bozohttpd defaults to mapping upto 64MB regions and writing
> out up to 64KB at a time.

cp(1) now maps a region upto 8MB and writes it out in chunks of at
most 64KB.

        Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/