| From: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
|---|---|
| To: | Peter Geoghegan <pg(at)heroku(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: B-Tree support function number 3 (strxfrm() optimization) |
| Date: | 2014-09-15 11:00:56 |
| Message-ID: | 5416C6E8.2090401@vmware.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On 09/14/2014 11:34 PM, Peter Geoghegan wrote:
> On Sun, Sep 14, 2014 at 7:37 AM, Heikki Linnakangas
> <hlinnakangas(at)vmware(dot)com> wrote:
>> Both values vary in range 5.9 - 6.1 s, so it's fair to say that the useless
>> memcmp() is free with these parameters.
>>
>> Is this the worst case scenario?
>
> Other than pushing the differences much much later in the strings
> (which you surely thought of already), yes.
Please test the absolute worst case scenario you can think of. As I said
earlier, if you can demonstrate that the slowdown of that is acceptable,
we don't even need to discuss how likely or realistic the case is.
- Heikki
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