From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 29 Sep 2011 19:10:06 GMT
Subject: Re: Git is not scalable with too many refs/*
Message-ID: <7vy5x7rwq9.fsf@alter.siamese.dyndns.org>
In-Reply-To: <4E84B89F.4060304@lsrfire.ath.cx>

René Scharfe <rene.scharfe@lsrfire.ath.cx> writes:

> Hmm.  Can we get rid of the multiple ref lookups fixed by the above
> *and* the overhead of dealing with a textual argument list at the same
> time by calling add_pending_object directly, like this?  (Factoring
> out add_pending_sha1 should be a separate patch..)

I haven't tested it or thought about it through, but it smells right ;-)

Also we would probably want to drop "next" field from "struct ref_list"
(i.e. making it not a linear list), introduce a new "struct ref_array"
that is a ALLOC_GROW() managed array of pointers to "struct ref_list",
make get_packed_refs() and get_loose_refs() return a pointer to "struct
ref_array" after sorting the array contents by "name". Then resolve_ref()
can do a bisection search in the packed refs array when it does not find a
loose ref.