Re: Performance monitor signal handler

At 13:34 12/03/01 -0800, Alfred Perlstein wrote:
>Is it possible
>to have a spinlock over it so that an external utility can take a snapshot
>of it with the spinlock held?

I'd suggest that locking the stats area might be a bad idea; there is only
one writer for each backend-specific chunk, and it won't matter a hell of a
lot if a reader gets inconsistent views (since I assume they will be
re-reading every second or so). All the stats area should contain would be
a bunch of counters with timestamps, I think, and the cost up writing to it
should be kept to an absolute minimum.


>
>just some ideas..
>

Unfortunatley, based on prior discussions, Bruce seems quite opposed to a
shared memory solution.


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