Tom Lane wrote:
Anyway, I've committed your patch with some changes.
Thanks.
BTW, I noticed a lot of concern in the Intel app notes about reserving
64 or even 128 bytes for each spinlock to avoid cache line conflicts.
That seems excessive to me (we use a lot of spinlocks for buffers), but
perhaps it is worth looking into.
This recommendation usually ignored in the Linux kernel. A few very hot
spinlocks have an exclusive cacheline, but most don't.
Is there an easy way find out which LWLock is contended?
Not from oprofile output, as far as I can think. I've suspected for
some time that the BufMgrLock is a major bottleneck, but have no proof.
I'll try to write a patch that dumps the LWLock usage and ask mark to
run it.
--
Manfred
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