Messages in this thread | | | Date | Thu, 27 Apr 2006 13:16:25 +0200 | From | Jens Axboe <> | Subject | Re: Lockless page cache test results |
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On Thu, Apr 27 2006, Jens Axboe wrote: > 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.
Added, 1 vs 2/3/4 clients isn't very interesting, so to keep it short here are numbers for 2 clients to /dev/null and localhost.
Sending to /dev/null
ml370:/data # ./splice-bench -n2 -l10 -a -s -z file Waiting for clients Client1 (splice): 19030 MiB/sec (10240MiB in 551 msecs) Client0 (splice): 18961 MiB/sec (10240MiB in 553 msecs) Client1 (mmap): 158875 MiB/sec (10240MiB in 66 msecs) Client0 (mmap): 158875 MiB/sec (10240MiB in 66 msecs) Client1 (rw): 1691 MiB/sec (10240MiB in 6200 msecs) Client0 (rw): 1690 MiB/sec (10240MiB in 6201 msecs)
Sending/receiving over lo
ml370:/data # ./splice-bench -n2 -l10 -a -s file Waiting for clients Client0 (splice): 3007 MiB/sec (10240MiB in 3486 msecs) Client1 (splice): 3003 MiB/sec (10240MiB in 3491 msecs) Client0 (mmap): 555 MiB/sec (8192MiB in 15094 msecs) Client1 (mmap): 580 MiB/sec (9216MiB in 16257 msecs) Client0 (rw): 538 MiB/sec (8192MiB in 15573 msecs) Client1 (rw): 541 MiB/sec (8192MiB in 15498 msecs)
-- Jens Axboe
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