Re: Spinlocks and compiler/memory barriers

On Tue, Jul 1, 2014 at 4:54 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
>> Despite my concerns about keeping the list of supported atomics short,
>> and I do have concerns in that area, I'm not really sure that we have
>> much choice but to go in that direction.  We can't accept a >5x
>> performance hit in the name of portability, and that's literally what
>> we're talking about in some cases.  I definitely want to think
>> carefully about how we proceed in this area but doing nothing doesn't
>> seem like an option.
>
> To be clear, I'm not advocating doing nothing (and I don't think anyone
> else is).  It's obvious based on Andres' results that we want to use
> atomics on platforms where they're well-supported.  The argument is
> around what we're going to do for other platforms.

OK, but that still seems like the issue on the other thread, not
what's being discussed here.

-- 
Robert Haas
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