Re: extend pgbench expressions with functions

On Tue, Feb 16, 2016 at 5:18 AM, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> wrote:
>>> Good point. One simple idea here would be to use a custom pgbench
>>> script that has no SQL commands and just calculates the values of some
>>> parameters to measure the impact without depending on the backend,
>>> with a fixed number of transactions.
>>
>> Sure, we could do that. But whether it materially changes pgbench -S
>> results, say, is a lot more important.
>
>
> Indeed. Several runs on my laptop:
>
> ~ 400000-540000 tps with master using:
> \set naccounts 100000 * :scale
> \setrandom aid 1 :naccounts
>
> ~ 430000-530000 tps with full function patch using:
> \set naccounts 100000 * :scale
> \setrandom aid 1 :naccounts
>
> ~ 730000-890000 tps with full function patch using:
> \set aid random(1, 100000 * :scale)
>
> The performance is pretty similar on the same script. The real pain is
> variable management, avoiding some is a win.

Wow, that's pretty nice.

--
Robert Haas
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