From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=) Newsgroups: gmane.lisp.guile.devel Subject: Re: Extremely high overhead of 'par-map' Date: Sun, 31 Mar 2013 00:37:46 +0100 Message-ID: <87fvzc8nn9.fsf@gnu.org> References: <1355559152.27310.5.camel@Renee-desktop.suse> <87y5d8rclr.fsf@gnu.org> <1364439334.2730.41.camel@Renee-desktop.suse> <874nfwazc3.fsf@tines.lan> <1364524610.2730.48.camel@Renee-desktop.suse> <87d2uiah6h.fsf@tines.lan> <878v56agp1.fsf_-_@tines.lan> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1364686685 4082 80.91.229.3 (30 Mar 2013 23:38:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 30 Mar 2013 23:38:05 +0000 (UTC) To: guile-devel@gnu.org Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Sun Mar 31 00:38:33 2013 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UM5Lz-0000Al-15 for guile-devel@m.gmane.org; Sun, 31 Mar 2013 00:38:31 +0100 Original-Received: from localhost ([::1]:37858 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UM5La-0008Vv-Kd for guile-devel@m.gmane.org; Sat, 30 Mar 2013 19:38:06 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:54372) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UM5LW-0008Vp-05 for guile-devel@gnu.org; Sat, 30 Mar 2013 19:38:03 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UM5LU-0006Ng-Q0 for guile-devel@gnu.org; Sat, 30 Mar 2013 19:38:01 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:45741) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UM5LU-0006Mj-JF for guile-devel@gnu.org; Sat, 30 Mar 2013 19:38:00 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1UM5Lo-0008V2-Px for guile-devel@gnu.org; Sun, 31 Mar 2013 00:38:20 +0100 Original-Received: from reverse-83.fdn.fr ([80.67.176.83]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 31 Mar 2013 00:38:20 +0100 Original-Received: from ludo by reverse-83.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 31 Mar 2013 00:38:20 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 10 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: reverse-83.fdn.fr User-Agent: Gnus/5.130005 (Ma Gnus v0.5) Emacs/24.3 (gnu/linux) X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 11 Germinal an 221 de la =?utf-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 83C4 F8E5 10A3 3B4C 5BEA D15D 77DD 95E2 EA52 ECF4 X-OS: x86_64-unknown-linux-gnu Cancel-Lock: sha1:QkO9VKW4KG9GJHLnotganUy+w1s= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:16062 Archived-At: Mark H Weaver skribis: > I must say that 'par-map' has shockingly poor performance. > We really ought to try to improve this. IMO we must improve futures, not necessarily ‘par-map’ itself, because lists are not a good data structure for parallel processing anyway (“get rid of cons” said Steele ;-)). Ludo’.