Re: Supporting huge pages on Windows

From: Thomas Munro [mailto:thomas(dot)munro(at)enterprisedb(dot)com]
> > huge_pages=off: 70412 tps
> > huge_pages=on : 72100 tps
>
> Hmm. I guess it could be noise or random code rearrangement effects.

I'm not the difference was a random noise, because running multiple set of three runs of pgbench (huge_pages = on, off, on, off, on...) produced similar results. But I expected a bit greater improvement, say, +10%. There may be better benchmark model where the large page stands out, but I think pgbench is not so bad because its random data access would cause TLB cache misses.

> I saw your recent post[2] proposing to remove the sentence about the 512MB
> effective limit and I wondered why you didn't go to larger sizes with a
> larger database and more run time. But I will let others with more
> benchmarking experience comment on the best approach to investigate Windows
> shared_buffers performance.

Yes, I could have gone to 8GB of shared_buffers because my PC has 16GB of RAM, but I felt the number of variations was sufficient. Anyway, positive comments on benchmarking would be appreciated.

Regards
Takayuki Tsunakawa