On Thu, Mar 21, 2024 at 03:40:12PM -0500, Nathan Bossart wrote:
> On Thu, Mar 21, 2024 at 04:31:45PM -0400, Tom Lane wrote:
>> I don't think we have any really cheap way to de-duplicate the role
>> OIDs, especially seeing that it has to be done on-the-fly within the
>> collection loop, and the order of roles_list is at least potentially
>> interesting. Not sure how to make further progress without a lot of
>> work.
>
> Assuming these are larger lists, this might benefit from optimizations
> involving SIMD intrinsics. I looked into that a while ago [0], but the
> effort was abandoned because we didn't have any concrete use-cases at the
> time. (I'm looking into some additional optimizations in a separate thread
> [1] that would likely apply here, too.)
Never mind. With the reproduction script, I'm only seeing a ~2%
improvement with my patches.
--
Nathan Bossart
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