Return-Path: X-Original-To: apmail-mahout-dev-archive@www.apache.org Delivered-To: apmail-mahout-dev-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id B3350181FD for ; Sun, 25 Oct 2015 21:31:28 +0000 (UTC) Received: (qmail 37178 invoked by uid 500); 25 Oct 2015 21:31:28 -0000 Delivered-To: apmail-mahout-dev-archive@mahout.apache.org Received: (qmail 37025 invoked by uid 500); 25 Oct 2015 21:31:28 -0000 Mailing-List: contact dev-help@mahout.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@mahout.apache.org Delivered-To: mailing list dev@mahout.apache.org Received: (qmail 37003 invoked by uid 99); 25 Oct 2015 21:31:27 -0000 Received: from arcas.apache.org (HELO arcas) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 25 Oct 2015 21:31:27 +0000 Received: from arcas.apache.org (localhost [127.0.0.1]) by arcas (Postfix) with ESMTP id D1F3D2C1F5A for ; Sun, 25 Oct 2015 21:31:27 +0000 (UTC) Date: Sun, 25 Oct 2015 21:31:27 +0000 (UTC) From: "Suneel Marthi (JIRA)" To: dev@mahout.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (MAHOUT-1781) Dense matrix view multiplication is 4x slower than non-view one MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/MAHOUT-1781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Suneel Marthi updated MAHOUT-1781: ---------------------------------- Fix Version/s: (was: 0.11.1) 0.13.0 0.12.0 > Dense matrix view multiplication is 4x slower than non-view one > --------------------------------------------------------------- > > Key: MAHOUT-1781 > URL: https://issues.apache.org/jira/browse/MAHOUT-1781 > Project: Mahout > Issue Type: Improvement > Affects Versions: 0.11.0 > Reporter: Dmitriy Lyubimov > Assignee: Dmitriy Lyubimov > Priority: Critical > Fix For: 0.12.0, 0.13.0 > > > if mxA and mxB are two in-core DenseMatrix matrices, then > mxA(::,::) %*% mxB(::,::) takes 4x the time of mxA %*% mxB. > possibly an issue of dot products on VectorViews vs. DenseVectors. > dot product over DenseVectors seems to not to go through aggregate() cost-optimized framework. -- This message was sent by Atlassian JIRA (v6.3.4#6332)