Re: Fw: Fw: bad performance on irix

Okay. Anyway, the semaphores are apparently used for purposes other than
TAS. That can be made faster too, on platforms which support POSIX
mutexes (shared between processes).

"Robert E. Bruccoleri" wrote:
>
> Dear Igor,
>
> > I am confused to hell. I always thought MIPS does NOT have TAS
> > instruction ;)
>
> On the SGI platform, there are very high speed implementations of test
> and set which allow large number of processes to safely and quickly
> access shared memory. SGI has a hardware team that specifies MIPS
> processor variants that are used in their servers so the machines can
> scale.
>
> I've tried to get SGI interested in putting some internal engineering
> effort to improve PostgreSQL performance on operations which could
> benefit from its shared memory parallel architecture (like index
> creation and sorting), but without success.
>
> +-----------------------------+------------------------------------+
> | Robert E. Bruccoleri, Ph.D. | email: bruc(at)acm(dot)org |
> | P.O. Box 314 | URL: http://www.congen.com/~bruc |
> | Pennington, NJ 08534 | |
> +-----------------------------+------------------------------------+