On January 1, 2015 8:49:06 PM CET, Robert Haas <robertmh...@gmail.com> wrote:
>On Thu, Jan 1, 2015 at 11:59 AM, Andres Freund <and...@2ndquadrant.com>
>> The problem is that just aligning the main allocation to some
>> doesn't mean the hot part of the allocation is properly aligned.
>> in fact can't really do much about that - so fully moving the
>> responsibility seems more likely to ensure that future code thinks
>> alignment.
>That's true, but if you don't align the beginnings of the allocations,
>then it's a lot more complicated for the code to properly align stuff
>within the allocation.  It's got to insert a variable amount of
>padding based on the alignment it happens to get.

Hm? Allocate +PG_CACHELINE_SIZE and do var = CACHELINEALIGN(var).

Please excuse brevity and formatting - I am writing this on my mobile phone.

Andres Freund                      http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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