From: Junio C Hamano <gitster@pobox.com>
Date: Sun, 14 Feb 2010 01:37:21 GMT
Subject: Re: [PATCH] don't use mmap() to hash files
Message-ID: <7vtytk61im.fsf@alter.siamese.dyndns.org>
In-Reply-To: <20100214011812.GA2175@dpotapov.dyndns.org>

Dmitry Potapov <dpotapov@gmail.com> writes:

> If a mmapped file is changed by another program during git-add, it
> causes the repository corruption. Disabling mmap() in index_fd() does
> not have any negative impact on the overall speed of Git. In fact, it
> makes git hash-object to work slightly faster....
> ...
> I think more people should test this change to see its impact on
> performance. For me, it was positive. Here is my results:

I wasn't particularly impressed by the original problem description, but
this is a very interesting result.