From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: pjb@informatimago.com (Pascal J. Bourguignon) Newsgroups: gmane.emacs.help Subject: Re: Length of obarray vectors Date: Fri, 06 Nov 2009 12:16:38 +0100 Organization: Informatimago Message-ID: <87y6mjdht5.fsf@galatea.local> References: <3da94a34-686a-4aaf-a627-109fdbc9150d@v25g2000yqk.googlegroups.com> <9760b6da-3458-4fd3-9e4e-febd18a5060a@b2g2000yqi.googlegroups.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1257507756 31482 80.91.229.12 (6 Nov 2009 11:42:36 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 6 Nov 2009 11:42:36 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Nov 06 12:42:29 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1N6NCx-0002US-2q for geh-help-gnu-emacs@m.gmane.org; Fri, 06 Nov 2009 12:42:23 +0100 Original-Received: from localhost ([127.0.0.1]:37215 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1N6NCw-0004gG-Fc for geh-help-gnu-emacs@m.gmane.org; Fri, 06 Nov 2009 06:42:22 -0500 Original-Path: news.stanford.edu!usenet.stanford.edu!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 23 Original-X-Trace: individual.net tTho80yI5RPNcRXxQTuI1QECTCeNn08QJWooWeiX1JlezaPrQp Cancel-Lock: sha1:NjE0YzcyNjFjYzUyYjZhNDg4MDdmYThhYmRlYTkxYzM4MTUxZDk1Yw== sha1:fdImcu4+Tmaq6Vn1ZnTLWBfazuA= Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en X-Disabled: X-No-Archive: no User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/22.3 (darwin) Original-Xref: news.stanford.edu gnu.emacs.help:174464 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:69541 Archived-At: Nordlöw writes: > On Nov 6, 11:18 am, Nordlöw 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__