Any interest in swat enhancement
David.Collier-Brown at canada.sun.com
Wed Sep 6 12:22:26 GMT 2000
Jean Francois Micouleau wrote:
> yes ! I would be able to send printer notify updates to all smbd process
> in one shoot :-)
> How do you remove from the queue a message that was send to all the
> smbd process ?
You either duplicate the messages on send, or keep
a reference count.
One of my smarter colleagues looked at a customer
system which did the reference-counting, and found
the locks required were a significant bottleneck
at high message rates. Implementing send-multiple
the simple was was a cure.
This is a general case of what we've found when
re-implementing System V message queues (several
times!) over the years: getting the locking right
is the major performance issue. Other probable
truisms: many small queues make light work, and
lock-free (non-circular) queue schemes are cool.
--dave (wearing his Solaris hat) c-b
David Collier-Brown, | Always do right. This will gratify some people
185 Ellerslie Ave., | and astonish the rest. -- Mark Twain
Willowdale, Ontario | //www.oreilly.com/catalog/samba/author.html
Work: (905) 415-2849 Home: (416) 223-8968 Email: davecb at canada.sun.com
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