| From: | Greg Stark <gsstark(at)mit(dot)edu> |
|---|---|
| To: | Stephen Frost <sfrost(at)snowman(dot)net> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Pre-alloc ListCell's optimization |
| Date: | 2011-05-27 03:36:53 |
| Message-ID: | BANLkTikRa_cbsjOfRh-0Cx=77vR62bLY5g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, May 26, 2011 at 11:57 AM, Stephen Frost <sfrost(at)snowman(dot)net> wrote:
> Handling the 1-entry case would likely be pretty
> straight-forward, but you need book-keeping as soon as you go to two,
> and all that book-keeping feels like overkill for just a 2-entry cache
> to me.
Incidentally what if I call nconc and pass a second arg of a list that
has the first few elements stashed in an array. Do you copy those
elements into cells before doing the nconc? Does our nconc support
having lists share cells? I suspect it doesn't actually so perhaps
that's good enough.
--
greg
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