Re: Lockless page cache test results

Jens Axboe
2006-04-27T08:02:43Z

On Thu, Apr 27 2006, KAMEZAWA Hiroyuki wrote:
> On Wed, 26 Apr 2006 20:57:50 +0200
> Jens Axboe <axboe@suse.de> wrote:
>
> > On Wed, Apr 26 2006, Jens Axboe wrote:
> > > We can speedup the lookups with find_get_pages(). The test does 64k max,
> > > so with luck we should be able to pull 16 pages in at the time. I'll try
> > > and run such a test. But boy I wish find_get_pages_contig() was there
> > > for that. I think I'd prefer adding that instead of coding that logic in
> > > splice, it can get a little tricky.
> >
> > Here's such a run, graphed with the other two. I'll redo the lockless
> > side as well now, it's only fair to compare with that batching as well.
> >
>
> Hi, thank you for interesting tests.
>
> >From user's view, I want to see the comparison among
> - splice(file,/dev/null),
> - mmap+madvise(file,WILLNEED)/write(/dev/null),
> - read(file)/write(/dev/null)
> in this 1-4 threads test.
>
> This will show when splice() can be used effectively.

Sure, should be easy enough to do.

--
Jens Axboe