From: pjb@informatimago.com (Pascal J. Bourguignon)
To: help-gnu-emacs@gnu.org
Subject: Re: Length of obarray vectors
Date: Fri, 06 Nov 2009 12:16:38 +0100 [thread overview]
Message-ID: <87y6mjdht5.fsf@galatea.local> (raw)
In-Reply-To: 9760b6da-3458-4fd3-9e4e-febd18a5060a@b2g2000yqi.googlegroups.com
Nordlöw <per.nordlow@gmail.com> writes:
> On Nov 6, 11:18 am, Nordlöw <per.nord...@gmail.com> wrote:
>> What length should I use when I create a vector that will act as an
>> obarray?
>> My suggestion: The smallest prime larger than the number of symbols
>> that should be interned?
>> If this is correct why does (length obarray) give such a small number,
>> 15
>>
>> Thanks,
>> Nordlöw
>
> It should be 1511, not 15.
>
> Forgot one thing: My guess: Is it a trade-off of performance (big
> length) and memory usage (small length)?
The reason is that obarrays are not arrays, but trees. You're watching
only the root of the tree.
--
__Pascal Bourguignon__
next prev parent reply other threads:[~2009-11-06 11:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-06 10:18 Length of obarray vectors Nordlöw
2009-11-06 10:20 ` Nordlöw
2009-11-06 11:16 ` Pascal J. Bourguignon [this message]
2009-11-06 12:03 ` Pascal J. Bourguignon
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