From: Eric Wong <normalperson@yhbt.net>
To: ruby.io.splice@librelist.com
Subject: Re: Some benchmarks
Date: Mon, 27 Dec 2010 13:38:52 -0800 [thread overview]
Message-ID: <20101227213852.GA4825@dcvr.yhbt.net> (raw)
In-Reply-To: AANLkTimBrXN-6BXK-ifaCLFrznQhQqXqW1dhJq0CtHFO@mail.gmail.com
Iñaki Baz Castillo <ibc@aliax.net> wrote:
> 2010/12/23 Iñaki Baz Castillo <ibc@aliax.net>:
> >> Try it on a tmpfs mount.
> >
> > Yes, that would be my next test.
>
> Hummm, I get "non expected" results when using a tmpfs as destination
> for the copy. I attach a new test file which makes usage of IO splice
> in different ways ("manual", using IO objects and using file names).
The setup of the splice methods is rather expensive (both the pure Ruby
portion and also the kernel pipe()).
I don't think a 1M file is really enough to test with (consider the size
of L2 caches these days), try playing around with bigger files, maybe
tens or even hundreds of megs (if it can fit in tmpfs).
You should also get Benchmark to report system and user time,
realtime can be misleading
--
Eric Wong
prev parent reply other threads:[~2010-12-27 21:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTi=M+qGa7G1PvYyB+fbJUzrersJQwtDkct3hZEiy@mail.gmail.com>
2010-12-22 14:01 ` Some benchmarks Iñaki Baz Castillo
2010-12-22 19:56 ` Eric Wong
2010-12-23 15:41 ` Iñaki Baz Castillo
2010-12-23 18:06 ` Eric Wong
2010-12-27 10:01 ` Iñaki Baz Castillo
2010-12-27 17:33 ` Iñaki Baz Castillo
2010-12-27 21:38 ` Eric Wong [this message]
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