Re: Lockless page cache test results

KAMEZAWA Hiroyuki
2006-04-27T02:18:36Z

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.

Thanks,
-Kame