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.

----------------------------------------------------------------
Philip Warner | __---_____
Albatross Consulting Pty. Ltd. |----/ - \
(A.B.N. 75 008 659 498) | /(@) ______---_
Tel: (+61) 0500 83 82 81 | _________ \
Fax: (+61) 0500 83 82 82 | ___________ |
Http://www.rhyme.com.au | / \|
| --________--
PGP key available upon request, | /
and from pgp5.ai.mit.edu:11371 |/