Return-Path: X-Original-To: apmail-accumulo-notifications-archive@minotaur.apache.org Delivered-To: apmail-accumulo-notifications-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id D2C8411D8E for ; Fri, 22 Aug 2014 17:28:11 +0000 (UTC) Received: (qmail 40697 invoked by uid 500); 22 Aug 2014 17:28:11 -0000 Delivered-To: apmail-accumulo-notifications-archive@accumulo.apache.org Received: (qmail 40656 invoked by uid 500); 22 Aug 2014 17:28:11 -0000 Mailing-List: contact notifications-help@accumulo.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: jira@apache.org Delivered-To: mailing list notifications@accumulo.apache.org Received: (qmail 40637 invoked by uid 99); 22 Aug 2014 17:28:11 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 22 Aug 2014 17:28:11 +0000 Date: Fri, 22 Aug 2014 17:28:11 +0000 (UTC) From: "Adam Fuchs (JIRA)" To: notifications@accumulo.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Assigned] (ACCUMULO-3079) improve system iterator performance by collapsing call stack 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/ACCUMULO-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Adam Fuchs reassigned ACCUMULO-3079: ------------------------------------ Assignee: Adam Fuchs > improve system iterator performance by collapsing call stack > ------------------------------------------------------------ > > Key: ACCUMULO-3079 > URL: https://issues.apache.org/jira/browse/ACCUMULO-3079 > Project: Accumulo > Issue Type: Improvement > Reporter: Adam Fuchs > Assignee: Adam Fuchs > Fix For: 1.6.1, 1.7.0 > > Attachments: iterator_performance_20140822_1.patch > > > System iterators are at the core of the tightest loops in Accumulo, handling every key/value pair that traverses through a scan or a compaction. In many cases, iterators are the current performance bottleneck for Accumulo. Every bit that we can improve performance in the iterators translates into better performance for Accumulo. > There are several strategies that can be applied to the current code base to improve performance, including: > # Inlining calls that are hard for the JVM to inline at runtime > # Moving checks for null outside of tight loops when they are invariants within the loop > # Eliminating "no-op" iterators at iterator tree construction time > # Making frequently used and assigned-once objects final (like iterator sources) -- This message was sent by Atlassian JIRA (v6.2#6252)