From: Jeff King <peff@peff.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org
Subject: Re: diffcore-rename performance mode
Date: Tue, 18 Sep 2007 05:01:05 -0400 [thread overview]
Message-ID: <20070918090105.GA11854@coredump.intra.peff.net> (raw)
In-Reply-To: <7vhclswdsm.fsf@gitster.siamese.dyndns.org>
On Tue, Sep 18, 2007 at 01:58:17AM -0700, Junio C Hamano wrote:
> > I thought we were holding counts of hashes, in which case there _is_ no
> > overflow.
>
> The raw hashval (the fingerprint recorded in struct spanhash) is
> further reduced and used as an index into spahash_top.data[].
> So more than one hashval can try to sit in the same slot in
> spanhash_top.data[] array.
Right, that's sort of what I was hinting at in the original message. Can
we just make the hash table big enough to use the fingerprint hashes
directly? It's going to use a bit more memory, but lookups should be
very fast. I'll try to experiment and get some numbers.
-Peff
next prev parent reply other threads:[~2007-09-18 9:01 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-18 8:23 diffcore-rename performance mode Jeff King
2007-09-18 8:49 ` Junio C Hamano
2007-09-18 8:54 ` Jeff King
2007-09-18 8:58 ` Junio C Hamano
2007-09-18 9:01 ` Jeff King [this message]
2007-09-18 9:17 ` Junio C Hamano
2007-09-18 11:20 ` Johannes Schindelin
2007-09-25 16:38 ` Jeff King
2007-09-25 19:06 ` Jeff King
2007-09-25 19:10 ` Andreas Ericsson
2007-09-25 19:32 ` David Kastrup
2007-09-25 19:52 ` Jeff King
2007-09-18 22:12 ` Linus Torvalds
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