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Re: Speed up genattrtab

From: Ralf Wildenhues <Ralf dot Wildenhues at gmx dot de>
To: Mark Mitchell <mark at codesourcery dot com>
Cc: Jan Hubicka <hubicka at ucw dot cz>, Michael Matz <matz at suse dot de>, gcc-patches at gcc dot gnu dot org
Date: Tue, 15 Jun 2010 21:03:40 +0200
Subject: Re: Speed up genattrtab
References: <Pine.LNX.4.64.1006151807190.15724@wotan.suse.de> <4C17B61F.2030602@codesourcery.com> <20100615172641.GE10161@atrey.karlin.mff.cuni.cz> <4C17C8F3.10700@codesourcery.com>

* Mark Mitchell wrote on Tue, Jun 15, 2010 at 08:39:47PM CEST:
> But if some easy Makefile hackery would help some developers,
> I'd still argue we should do it.

IIRC, this hackery has already been done sometime last year or
so, with reordering of objects and the order-only dependencies.
Unless the build has changed a lot (haven't checked), it is
simply not possible to improve in a generally useful way
without changing GNU make to allow for more fine-tuning.

It is typically helpful to not increase N in -jN too much over
the number of available cores.

Cheers,
Ralf

References:
- Speed up genattrtab
  - From: Michael Matz
- Re: Speed up genattrtab
  - From: Mark Mitchell
- Re: Speed up genattrtab
  - From: Jan Hubicka
- Re: Speed up genattrtab
  - From: Mark Mitchell

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