Messages in this thread | | | Date | Thu, 27 Apr 2006 20:41:32 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: Lockless page cache test results |
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On Thu, 27 Apr 2006 13:16:25 +0200 Jens Axboe <axboe@suse.de> wrote:
> 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. > Thank you! looks splice has significant advantage :)
> 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) This maybe shows cost of gathering page-cache.
> Client1 (mmap): 158875 MiB/sec (10240MiB in 66 msecs) > Client0 (mmap): 158875 MiB/sec (10240MiB in 66 msecs) This shows read/write system-call and user program cost. right ?
> Client1 (rw): 1691 MiB/sec (10240MiB in 6200 msecs) > Client0 (rw): 1690 MiB/sec (10240MiB in 6201 msecs) > This shows 10240MiB copy_to_user() cost. BTW, How big are cpu-cache-size and read/write buffer size in this test ?
> Sending/receiving over lo > read from a file and write to 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) >
Thank you. -Kame
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