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Re: Aligned blocks management: obsolete?

From: Stefan Monnier
Subject: Re: Aligned blocks management: obsolete?
Date: Wed, 20 Jun 2012 11:41:57 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux)

>> I'm not completely sure the test is sufficiently thorough to catch all
>> problems, and more importantly it doesn't test the efficiency
>> of memalign.
> If it's just a matter of configure test, different methods may be used.
> For example, attached code checks whether memalign tends to create holes
> while allocating (1024 - 8) blocks aligned at 1024-bytes boundary;

You want to mix those allocations with a few others of different sizes,
since some of the problems show up in those cases (e.g.
"memalign(1024); malloc(10); memalign(1024)" might end up wasting 1KB
between the malloc and the second memalign).

> optimal pad (BLOCK_PADDING in current code) may be detected with the
> similar way.

That would be good.


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