| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Christoph Berg <myon(at)debian(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
| Subject: | Re: pgbench test failing on 14beta1 on Debian/i386 |
| Date: | 2021-05-18 23:40:59 |
| Message-ID: | CA+hUKGJri_OK6VSk56NVOyfYRKOQs1B6nDpCUPo12jiRxJ1Jsw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, May 19, 2021 at 11:34 AM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> I don't understand any of this stuff at all, but I added a bunch of
> printfs and worked out that the first point its local variables
> diverge is here:
>
> /* Random offset */
> r = (uint64) getrand(&random_state2, 0, size - 1);
Forgot to post the actual values:
r = 2563421694876090368
r = 2563421694876090365
Smells a bit like a precision problem in the workings of pg_erand48(),
but as soon as I saw floating point numbers I closed my laptop and ran
for the door.
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