From: Bakul Shah <bakul+plan9@bitblocks.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] Clearing venti arena during install
Date: Sun, 26 Mar 2006 17:23:34 -0800 [thread overview]
Message-ID: <20060327012334.7DA67294EF@mail.bitblocks.com> (raw)
In-Reply-To: Your message of "Sun, 26 Mar 2006 19:57:25 EST." <5032f8591800c63e04a9a8b18c1b63ea@swtch.com>
> > In the common (real-life) case, the test of the first word suffices.
> > The word-at-a-time scan can be made to run fairly fast, especially if
> > you have the option of first putting a non-zero word just after the
> > buffer, so that no explicit bounds test is necessary in the loop.
>
> Or temporarily unzeroing the last word in the buffer.
So if you are asked to allocate a disk block only to write a
block of zeroes, don't! I can dig that! That fills a hole
in my education. Thanks guys!
next prev parent reply other threads:[~2006-03-27 1:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-26 21:04 bakul+plan9
2006-03-27 0:09 ` Russ Cox
2006-03-27 0:23 ` bakul+plan9
2006-03-27 0:30 ` Russ Cox
2006-03-27 0:33 ` Russ Cox
2006-03-27 0:52 ` geoff
2006-03-27 0:57 ` Russ Cox
2006-03-27 1:23 ` Bakul Shah [this message]
2006-04-17 9:57 ` Lluís Batlle i Rossell
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