Re: "stuck spinlock"

Christophe Pettus <xof(at)thebuild(dot)com> writes:
> On Dec 12, 2013, at 5:45 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Presumably, we are seeing the victim rather than the perpetrator of
>> whatever is going wrong.

> This is probing about a bit blindly, but the only thing I can see about this system that is in some way unique (and this is happening on multiple machines, so it's unlikely to be hardware) is that there are a relatively large number of relations (like, 440,000+) distributed over many schemas. Is there anything that pins a buffer that is O(N) to the number of relations?

It's not a buffer *pin* that's at issue, it's a buffer header spinlock.
And there are no loops, of any sort, that are executed while holding
such a spinlock. At least not in the core PG code. Are you possibly
using any nonstandard extensions?

regards, tom lane