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DragonFly kernel List (threaded) for 2005-02
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Re: phk malloc, was (Re: ptmalloc2)

From: Ted Unangst <tedu@xxxxxxxxxxxxx>
Date: Wed, 23 Feb 2005 03:06:16 -0500

On Thu, 17 Feb 2005, Jonathan Dama wrote:

Ideally, you ought to be able to fill malloc's backing keg
with allocations from mmap permitting MAXDSIZ to be left
alone.  (phk reports that mmap is x5 slower than brk--see:
--but this could be made up by simply going to the kernel
less frequently--see further:)

in the real world, the slowdown is more like 10% for something like buildworld. not great, but not crippling like 500% would be.

Moreover, it may even brk for every additional 4K of
allocation via malloc.

if you allocate 4k at a time, yes it does.

-- we don't run washington and no one really does

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