From dev-return-2380-archive-asf-public=cust-asf.ponee.io@systemml.apache.org Sun Mar 18 01:42:59 2018 Return-Path: X-Original-To: archive-asf-public@cust-asf.ponee.io Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by mx-eu-01.ponee.io (Postfix) with SMTP id E15A9180652 for ; Sun, 18 Mar 2018 01:42:58 +0100 (CET) Received: (qmail 85945 invoked by uid 500); 18 Mar 2018 00:42:57 -0000 Mailing-List: contact dev-help@systemml.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@systemml.apache.org Delivered-To: mailing list dev@systemml.apache.org Received: (qmail 85929 invoked by uid 99); 18 Mar 2018 00:42:57 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd1-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 18 Mar 2018 00:42:57 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd1-us-west.apache.org (ASF Mail Server at spamd1-us-west.apache.org) with ESMTP id CBC4AC14D0 for ; Sun, 18 Mar 2018 00:42:56 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd1-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 2.148 X-Spam-Level: ** X-Spam-Status: No, score=2.148 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, HTML_MESSAGE=2, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001] autolearn=disabled Authentication-Results: spamd1-us-west.apache.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mx1-lw-us.apache.org ([10.40.0.8]) by localhost (spamd1-us-west.apache.org [10.40.0.7]) (amavisd-new, port 10024) with ESMTP id abBhZ-D_4sgu for ; Sun, 18 Mar 2018 00:42:55 +0000 (UTC) Received: from mail-ua0-f171.google.com (mail-ua0-f171.google.com [209.85.217.171]) by mx1-lw-us.apache.org (ASF Mail Server at mx1-lw-us.apache.org) with ESMTPS id CF5A25F230 for ; Sun, 18 Mar 2018 00:42:54 +0000 (UTC) Received: by mail-ua0-f171.google.com with SMTP id d1so8858506ual.13 for ; Sat, 17 Mar 2018 17:42:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=0F+XSC5B9hhrWmJDmll35/uagyUe1GMqMcOZZXIuUXc=; b=JlSPXfaD5mrwjsBcvaoGZhToewV6HOY6G5Y2iYchaiGkFpVIZxujOBGz3k7X3Y0NHp fiCPoswEqVpB6jF+0exb/jyf3HXdFtdD9iSNskio3485Jkc6IE3cRb8/NJxgbkBguZ9p wkhHCryDe4OmlvFP5MGeub/LgpH7UTavrexBbhtozD8uoe0eHB3DQMS7ORDVzHoeuOw9 9oI+OvVj0Ha+2UTNTiyyq4HE3p+9S72zuFePOy+LrHeZEHb0XKKzxw8EtR2UGaMbWlOh ICTLRemUuzTv11NNAQCusm40lqUfYpLmYbSlh3o99QDwsxEteuLLy39go/gLkCMAhE6Z CqCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=0F+XSC5B9hhrWmJDmll35/uagyUe1GMqMcOZZXIuUXc=; b=l5i4GmNjtHFYI7+rnkvzMYkVNyMfa/MoEWeo7nrrxg8bR2Dtp9p3TH7o+Fmfk1bwSC iy1z60f/vlK8hCFzBvVCVYv5vE6hSZmpIBcEACg9CNIbeuWmcdOpZuJyjH60SBbcRMJb CljAxqP642CRjYiZuQebFXrJj/a0f0nyuUOzL41k8BU/34c7GQUaqxXeVMjD5ecV8rdo 7rNV4Trwvra0xzOAShJj/gspI4fSJj9hPkBp8NtNbgARAUrvnotyHhQpAvKWy/ypNqmS W8M7bPNI+HSNdLBLoqTiMdtWfWw/ibxUjMp5GFCObhGbIoKf97R1YRQy1C2s2BTGMSlW 0Ivw== X-Gm-Message-State: AElRT7HXVnO7DcvaorQYVotKwOP6e1YCDoM6MwPsLN2BHEXe9V4BIDHt Ajpd98Xo0h8Gq+dvRgmkdCXqYfZ19mReu+MleA== X-Google-Smtp-Source: AG47ELtRviLSIyfKx2hOwIjwlrgvzowOjvnsP/fHXOkrXCCGJTEJKtPvlRq2zUNeBHi8vPQjSsi8YF7fcnywNhCAJ6A= X-Received: by 10.176.86.74 with SMTP id z10mr4803386uaa.154.1521333774184; Sat, 17 Mar 2018 17:42:54 -0700 (PDT) MIME-Version: 1.0 Received: by 10.176.0.140 with HTTP; Sat, 17 Mar 2018 17:42:53 -0700 (PDT) In-Reply-To: References: From: Matthias Boehm Date: Sat, 17 Mar 2018 17:42:53 -0700 Message-ID: Subject: Fwd: Sub projects in Language and run time for parameter servers [SYSTEMML-2083] To: dev@systemml.apache.org Content-Type: multipart/alternative; boundary="f403045e342231f6e90567a51f6b" --f403045e342231f6e90567a51f6b Content-Type: text/plain; charset="UTF-8" ---------- Forwarded message ---------- From: Matthias Boehm Date: Sat, Mar 17, 2018 at 5:41 PM Subject: Re: Sub projects in Language and run time for parameter servers [SYSTEMML-2083] To: Chamath Abeysinghe great to see that you're making progress on your proposal. However and as a general note to all students, please don't share your personal proposals here. Instead submit your proposals through the official channel, the GSoC website, and I will provide feedback there. Having said that, if you have questions related to SystemML in general or specifics of individual components, please, don't hesitate to ask them here. Regards, Matthias On Fri, Mar 16, 2018 at 4:17 AM, Chamath Abeysinghe < abeysinghechamath@gmail.com> wrote: > Hi Matthias, > After going through JIRA sub projects and references you provide I thought > of drafting proposal focusing the Distributed spark backend > project because it > seems challenging and exciting area to explore :-). > I have sketched a rough diagram for design and the implementation plan for > the proposal, https://drive.google.com/file/d/1MTlYWvkkApe28vDOo > dDR8hmxzVx9QwQX/view?usp=sharing > > My idea is making Paramserv runtime similar design to ParFor runtime, and > as a extension it will handle parameter exchange. So there I will work on > some primitives required by runtime to manage the PS and then in Spark I > will implement a parameter server. Initially it will work using synchronous > method and then if time allows I will experiment with other methods and > performance factors. > > And also regarding the control program I have some concerns, > In the project JIRA it was mentioned that "PS strategies will be selected > by the user", does this include the architecture of the parameter server(# > of workers and servers) also or does it need to be handled in the > project? > > I hope this plan aligns with expectations of the community and does not > conflicts with other GSoC candidates. Your feedback for this highly > appreciated, if there is anything wrong please correct me. Thanks > > *PS : I am re sending the same mail because it seems previous mail with > attachment was not delivered to the dev mailing list. * > > Regards, > Chamath > > > On Fri, Mar 9, 2018 at 2:19 PM, Matthias Boehm wrote: > >> Hi Chamath, >> >> ad 1: Yes, this is absolutely correct. However, it is important to >> realize that within the workers, we want to run dml functions, and for >> these we'll reuse our existing compiler, runtime, operations, and data >> structures. >> >> ad 2: Yes, this is also correct. Indeed we can use an existing parfor >> (with local execution mode) to emulate a local, synchronous parameter >> server. However, it would be very hard - and conflicting with our >> functional and thus, stateless execution semantics - to incorporate >> asynchronous updates and strategies such as Hogwild!. Furthermore, such a >> local parameter server might also have an application with very large >> models and batches, because this would enable distributed data-parallel >> operations spawn from each local worker. >> >> ad 3: Unfortunately, there is no one single detailed architecture diagram >> because the system evolves over time. I would recommend to look at the >> following two papers, where especially [1] (the parfor paper, and its >> extensions for Spark in [2]) might give you a better idea of the parameter >> server and its workers, which are primarily meant to handle the >> orchestration and efficient parameter updates/exchange. if you're looking >> for coarse-grained component, then [3], slide 8 might be a starting point. >> At a high-level each operation and some constructs like parfor have >> physical operators for CP, SPARK, MR, and some for GPU. Similarly this >> project aims to introduce a new paramserv builtin function (most similar to >> parfor) and its different physical operators. >> >> ad 4: Since this paramserv function has similarity with parfor, we will >> be able to reuse key primitives for bringing up local/remote workers, >> shipping the compiled functions, and input data. The major extensions will >> be to call the shipped functions per batch, get the returned (i.e., >> updated) parameters and handle the exchange accordingly to the paramserv >> configuration. However, since paramserv as an operation is implemented from >> scratch, we can customize as needed and are not restricted by script-level >> semantics which renders the problem simpler as the general-purpose parfor >> construct. Both have their use cases. >> >> In case this did not clarify your questions, let us known and we'll sort >> it out. >> >> [1] http://www.vldb.org/pvldb/vol7/p553-boehm.pdf, 2014 >> [2] http://www.vldb.org/pvldb/vol9/p1425-boehm.pdf, 2016 >> [3] http://boss.dima.tu-berlin.de/media/BOSS16-Tutorial-mboehm.pdf, 2016 >> >> Regards, >> Matthias >> >> On Thu, Mar 8, 2018 at 10:28 PM, Chamath Abeysinghe < >> abeysinghechamath@gmail.com> wrote: >> >>> Hi, >>> I am trying to understand the purpose and work needed for different sub >>> projects in SYSTEMML-2083. And I got few questions, >>> >>> * In the JIRA it was mentioned that we are not integrating off the shelf >>> Parameter Server, but rather develop language and run time support from >>> scratch. As far as I understand, this means creating syntax for DML to >>> interact with the parameter server. And the parameter server implementation >>> is in different back-ends. So for example in Spark back end we have to >>> create a some kind of parameter server implementation with different >>> strategies, and it should be invoked by the syntax in DML. Is this >>> understanding correct? >>> >>> * In the JIRA there is a sub project for local multi threaded back-end. >>> In this project does "local" mean executing on single node similar to >>> ExecType.CP? If it is the case why use a parameter server for a single >>> node? >>> >>> * I was unable to find a architecture diagram for SystemML, is there any >>> that kind of diagram to understand the interaction between different >>> back-ends and language API or can you point me to those classes? >>> >>> * And those new run times, are they going to be completely new separate >>> run times or improvements to the existing ones? >>> >>> Please help me understand these issues. Thanks in advance. >>> >>> Regards, >>> Chamath >>> >>> >> > > > -- > Chamath Abeysinghe > Department of Computer Science and Engineering > University of Moratuwa > Mobile: +94712803295 <+94%2071%20280%203295> > --f403045e342231f6e90567a51f6b--