Re: Suggestions Needed: Latch free - library cache

It's always a little hard to tell from a low-concurrency experiment how bad things can be at high concurrency. (If it were easy, Cary wouldn't have had to have written his book).

I have an example where a collision rate of 0.25% results in an increase in response time of 8% at relatively low concurrency. One of the problems of contention is that the back-off time after a collision may be unsuitably large. (Which is one reason why there was an argument for changing the spin_count on latches - the backoff of 1/100 sec has not changed since 'fast' CPUs clocked 100MHz.)

Regards

Jonathan Lewis
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• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Friday, January 09, 2004 5:29 PM

> I remember readign that article and I thought the results that the
> contention was very minor? Steve, are you monitoring?
>
> It seemed like one of those things that its so minor its not really
> something to worry about?

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