| From: | Peter Geoghegan <peter(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: sortsupport for text |
| Date: | 2012-07-23 16:07:18 |
| Message-ID: | CAEYLb_Vt+4RheQUAoGcxNyj+LCozMka+dnvMzmfegPkj8v+mWQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 23 July 2012 16:36, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Mon, Jul 23, 2012 at 11:34 AM, Peter Geoghegan <peter(at)2ndquadrant(dot)com> wrote:
>>> tss->buflen = 1 << ffs(len1);
>>
>> I'm sorry, I don't follow you here. What is ffs() ?
>
> Sorry, fls, not ffs. I always get those mixed up.
>
> See src/port/fls.c
Oh, okay. Since, I infer, we're starting from a buffer-size that's a
power-of-two anyway, is there really any advantage in doing this
rather than just doubling the buffer size each time?
--
Peter Geoghegan http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training and Services
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