Re: Spinlocks, yet again: analysis and proposed patches

* Tom Lane (tgl@sss.pgh.pa.us) wrote:
> My proposal therefore is to do #2, #3, and #4, and to modify the TAS
> assembly code at least on x86_64.  Together, these changes bring
> my test case on a 4-way Opteron from
>
> N, runtime:    1 36s    2 61s    4 105s    8 198s

em64t, 2 proc + 2 HT, 3.4ghz, 4G, 2.6.12:

N, runtime:    1 31s    2 47s    4 86s    8 159s

> to
>
> N, runtime:    1 35s    2 48s    4 58s    8 105s

N, runtime:    1 32s    2 53s    4 90s    8 169s

CPU utilization is definitely higher when running with the patch though.
Hope this helps, happy to do additional testing if necessary.
Thanks,
    Stephen