| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, Euler Taveira de Oliveira <euler(at)timbira(dot)com>, Greg Smith <greg(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: EXPLAIN BUFFERS |
| Date: | 2009-12-14 04:11:42 |
| Message-ID: | 603c8f070912132011w590b6d03q7692ec1e02196631@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Dec 13, 2009 at 10:15 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> writes:
>> Should I add countBufferUsage boolean arguments to all places
>> doInstrument booleans are currently used? This requires several
>> minor modifications of codes in many places.
>
> Pushing extra arguments around would create overhead of its own ...
> overhead that would be paid even when not using EXPLAIN at all.
Well, I think we need to do something. I don't really want to tack
another 5-6% overhead onto EXPLAIN ANALYZE. Maybe we could recast the
doInstrument argument as a set of OR'd flags?
...Robert
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