Introduction to Parallel Computing
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A Case for High Performance Computing with Virtual Machines
A Case for High Performance Computing with Virtual Machines Wei Huangy Jiuxing Liuz Bulent Abaliz Dhabaleswar K. Panday y Computer Science and Engineering z IBM T. J. Watson Research Center The Ohio State University 19 Skyline Drive Columbus, OH 43210 Hawthorne, NY 10532 fhuanwei, [email protected] fjl, [email protected] ABSTRACT in the 1960s [9], but are experiencing a resurgence in both Virtual machine (VM) technologies are experiencing a resur- industry and research communities. A VM environment pro- gence in both industry and research communities. VMs of- vides virtualized hardware interfaces to VMs through a Vir- fer many desirable features such as security, ease of man- tual Machine Monitor (VMM) (also called hypervisor). VM agement, OS customization, performance isolation, check- technologies allow running different guest VMs in a phys- pointing, and migration, which can be very beneficial to ical box, with each guest VM possibly running a different the performance and the manageability of high performance guest operating system. They can also provide secure and computing (HPC) applications. However, very few HPC ap- portable environments to meet the demanding requirements plications are currently running in a virtualized environment of computing resources in modern computing systems. due to the performance overhead of virtualization. Further, Recently, network interconnects such as InfiniBand [16], using VMs for HPC also introduces additional challenges Myrinet [24] and Quadrics [31] are emerging, which provide such as management and distribution of OS images. very low latency (less than 5 µs) and very high bandwidth In this paper we present a case for HPC with virtual ma- (multiple Gbps). -
Mellanox Scalableshmem Support the Openshmem Parallel Programming Language Over Infiniband
SOFTWARE PRODUCT BRIEF Mellanox ScalableSHMEM Support the OpenSHMEM Parallel Programming Language over InfiniBand The SHMEM programming library is a one-side communications library that supports a unique set of parallel programming features including point-to-point and collective routines, synchronizations, atomic operations, and a shared memory paradigm used between the processes of a parallel programming application. SHMEM Details API defined by the OpenSHMEM.org consortium. There are two types of models for parallel The library works with the OpenFabrics RDMA programming. The first is the shared memory for Linux stack (OFED), and also has the ability model, in which all processes interact through a to utilize Mellanox Messaging libraries (MXM) globally addressable memory space. The other as well as Mellanox Fabric Collective Accelera- HIGHLIGHTS is a distributed memory model, in which each tions (FCA), providing an unprecedented level of FEATURES processor has its own memory, and interaction scalability for SHMEM programs running over – Use of symmetric variables and one- with another processors memory is done though InfiniBand. sided communication (put/get) message communication. The PGAS model, The use of Mellanox FCA provides for collective – RDMA for performance optimizations or Partitioned Global Address Space, uses a optimizations by taking advantage of the high for one-sided communications combination of these two methods, in which each performance features within the InfiniBand fabric, – Provides shared memory data transfer process has access to its own private memory, including topology aware coalescing, hardware operations (put/get), collective and also to shared variables that make up the operations, and atomic memory multicast and separate quality of service levels for global memory space. -
Introduction to Parallel Programming
Introduction to Parallel Programming Martin Čuma Center for High Performance Computing University of Utah [email protected] Overview • Types of parallel computers. • Parallel programming options. • How to write parallel applications. • How to compile. • How to debug/profile. • Summary, future expansion. 3/13/2009 http://www.chpc.utah.edu Slide 2 Parallel architectures Single processor: • SISD – single instruction single data. Multiple processors: • SIMD - single instruction multiple data. • MIMD – multiple instruction multiple data. Shared Memory Distributed Memory 3/13/2009 http://www.chpc.utah.edu Slide 3 Shared memory Dual quad-core node • All processors have BUS access to local memory CPU Memory • Simpler programming CPU Memory • Concurrent memory access Many-core node (e.g. SGI) • More specialized CPU Memory hardware BUS • CHPC : CPU Memory Linux clusters, 2, 4, 8 CPU Memory core nodes CPU Memory 3/13/2009 http://www.chpc.utah.edu Slide 4 Distributed memory • Process has access only BUS CPU to its local memory Memory • Data between processes CPU Memory must be communicated • More complex Node Network Node programming Node Node • Cheap commodity hardware Node Node • CHPC: Linux clusters Node Node (Arches, Updraft) 8 node cluster (64 cores) 3/13/2009 http://www.chpc.utah.edu Slide 5 Parallel programming options Shared Memory • Threads – POSIX Pthreads, OpenMP – Thread – own execution sequence but shares memory space with the original process • Message passing – processes – Process – entity that executes a program – has its own -
An Open Standard for SHMEM Implementations Introduction
OpenSHMEM: An Open Standard for SHMEM Implementations Introduction • OpenSHMEM is an effort to create a standardized SHMEM library for C , C++, and Fortran • OpenSHMEM is a Partitioned Global Address Space (PGAS) library and supports Single Program Multiple Data (SPMD) style of programming • SGI’s SHMEM API is the baseline for OpenSHMEM Specification 1.0 • One-sided communication is achieved through Symmetric variables • globals C/C++: Non-stack variables Fortran: objects in common blocks or with the SAVE attribute • dynamically allocated and managed by the OpenSHMEM Library Figure 1. Dynamic allocation of symmetric variable ‘x’ OpenSHMEM API • OpenSHMEM Specification 1.0 provides support for data transfer operations, collective and point- to-point synchronization mechanisms (barrier, fence, quiet, wait), collective operations (broadcast, collection, reduction), atomic memory operations (swap, fetch/add, increment), and distributed locks. • Open to the community for reviews and contributions. Current Status • University of Houston has developed a portable reference OpenSHMEM library. • OpenSHMEM Specification 1.0 man pages are available. • OpenSHMEM mailing list for discussions and contributions can be joined by emailing [email protected] • Website for OpenSHMEM and a Wiki for community use are available. Figure 2. University of Houston http://www.openshmem.org/ Implementation Future Work and Goals • Develop OpenSHMEM Specification 2.0 with co-operation and contribution from the OpenSHMEM community • Discuss and extend specification with important new capabilities • Improve on the OpenSHMEM reference implementation by providing support for scalable collective algorithms • Explore innovative hardware platforms . -
Cluster, Grid and Cloud Computing: a Detailed Comparison
The 6th International Conference on Computer Science & Education (ICCSE 2011) August 3-5, 2011. SuperStar Virgo, Singapore ThC 3.33 Cluster, Grid and Cloud Computing: A Detailed Comparison Naidila Sadashiv S. M Dilip Kumar Dept. of Computer Science and Engineering Dept. of Computer Science and Engineering Acharya Institute of Technology University Visvesvaraya College of Engineering (UVCE) Bangalore, India Bangalore, India [email protected] [email protected] Abstract—Cloud computing is rapidly growing as an alterna- with out any prior reservation and hence eliminates over- tive to conventional computing. However, it is based on models provisioning and improves resource utilization. like cluster computing, distributed computing, utility computing To the best of our knowledge, in the literature, only a few and grid computing in general. This paper presents an end-to- end comparison between Cluster Computing, Grid Computing comparisons have been appeared in the field of computing. and Cloud Computing, along with the challenges they face. This In this paper we bring out a complete comparison of the could help in better understanding these models and to know three computing models. Rest of the paper is organized as how they differ from its related concepts, all in one go. It also follows. The cluster computing, grid computing and cloud discusses the ongoing projects and different applications that use computing models are briefly explained in Section II. Issues these computing models as a platform for execution. An insight into some of the tools which can be used in the three computing and challenges related to these computing models are listed models to design and develop applications is given. -
Grid Computing: What Is It, and Why Do I Care?*
Grid Computing: What Is It, and Why Do I Care?* Ken MacInnis <[email protected]> * Or, “Mi caja es su caja!” (c) Ken MacInnis 2004 1 Outline Introduction and Motivation Examples Architecture, Components, Tools Lessons Learned and The Future Questions? (c) Ken MacInnis 2004 2 What is “grid computing”? Many different definitions: Utility computing Cycles for sale Distributed computing distributed.net RC5, SETI@Home High-performance resource sharing Clusters, storage, visualization, networking “We will probably see the spread of ‘computer utilities’, which, like present electric and telephone utilities, will service individual homes and offices across the country.” Len Kleinrock (1969) The word “grid” doesn’t equal Grid Computing: Sun Grid Engine is a mere scheduler! (c) Ken MacInnis 2004 3 Better definitions: Common protocols allowing large problems to be solved in a distributed multi-resource multi-user environment. “A computational grid is a hardware and software infrastructure that provides dependable, consistent, pervasive, and inexpensive access to high-end computational capabilities.” Kesselman & Foster (1998) “…coordinated resource sharing and problem solving in dynamic, multi- institutional virtual organizations.” Kesselman, Foster, Tuecke (2000) (c) Ken MacInnis 2004 4 New Challenges for Computing Grid computing evolved out of a need to share resources Flexible, ever-changing “virtual organizations” High-energy physics, astronomy, more Differing site policies with common needs Disparate computing needs -
Cloud Computing Over Cluster, Grid Computing: a Comparative Analysis
Journal of Grid and Distributed Computing Volume 1, Issue 1, 2011, pp-01-04 Available online at: http://www.bioinfo.in/contents.php?id=92 Cloud Computing Over Cluster, Grid Computing: a Comparative Analysis 1Indu Gandotra, 2Pawanesh Abrol, 3 Pooja Gupta, 3Rohit Uppal and 3Sandeep Singh 1Department of MCA, MIET, Jammu 2Department of Computer Science & IT, Jammu Univ, Jammu 3Department of MCA, MIET, Jammu e-mail: [email protected], [email protected], [email protected], [email protected], [email protected] Abstract—There are dozens of definitions for cloud Virtualization is a technology that enables sharing of computing and through each definition we can get the cloud resources. Cloud computing platform can become different idea about what a cloud computing exacting is? more flexible, extensible and reusable by adopting the Cloud computing is not a very new concept because it is concept of service oriented architecture [5].We will not connected to grid computing paradigm whose concept came need to unwrap the shrink wrapped software and install. into existence thirteen years ago. Cloud computing is not only related to Grid Computing but also to Utility computing The cloud is really very easier, just to install single as well as Cluster computing. Cloud computing is a software in the centralized facility and cover all the computing platform for sharing resources that include requirements of the company’s users [1]. software’s, business process, infrastructures and applications. Cloud computing also relies on the technology II. CLUSTER COMPUTING of virtualization. In this paper, we will discuss about Grid computing, Cluster computing and Cloud computing i.e. -
“Grid Computing”
VISHVESHWARAIAH TECHNOLOGICAL UNIVERSITY S.D.M COLLEGE OF ENGINEERING AND TECHNOLOGY A seminar report on “Grid Computing” Submitted by Nagaraj Baddi (2SD07CS402) 8th semester DEPARTMENT OF COMPUTER SCIENCE ENGINEERING 2009-10 1 VISHVESHWARAIAH TECHNOLOGICAL UNIVERSITY S.D.M COLLEGE OF ENGINEERING AND TECHNOLOGY DEPARTMENT OF COMPUTER SCIENCE ENGINEERING CERTIFICATE Certified that the seminar work entitled “Grid Computing” is a bonafide work presented by Mr. Nagaraj.M.Baddi, bearing USN 2SD07CS402 in a partial fulfillment for the award of degree of Bachelor of Engineering in Computer Science Engineering of the Vishveshwaraiah Technological University Belgaum, during the year 2009-10. The seminar report has been approved as it satisfies the academic requirements with respect to seminar work presented for the Bachelor of Engineering Degree. Staff in charge H.O.D CSE (S. L. DESHPANDE) (S. M. JOSHI) Name: Nagaraj M. Baddi USN: 2SD07CS402 2 INDEX 1. Introduction 4 2. History 5 3. How Grid Computing Works 6 4. Related technologies 8 4.1 Cluster computing 8 4.2 Peer-to-peer computing 9 4.3 Internet computing 9 5. Grid Computing Logical Levels 10 5.1 Cluster Grid 10 5.2 Campus Grid 10 5.3 Global Grid 10 6. Grid Architecture 11 6.1 Grid fabric 11 6.2 Core Grid middleware 12 6.3 User-level Grid middleware 12 6.4 Grid applications and portals. 13 7. Grid Applications 13 7.1 Distributed supercomputing 13 7.2 High-throughput computing 14 7.3 On-demand computing 14 7.4 Data-intensive computing 14 7.5 Collaborative computing 15 8. Difference: Grid Computing vs Cloud Computing 15 9. -
Exploring Massive Parallel Computation with GPU
Need for parallelism Graphical Processor Units Gravitational Microlensing Modelling Exploring Massive Parallel Computation with GPU Ian Bond Massey University, Auckland, New Zealand 2011 Sagan Exoplanet Workshop Pasadena, July 25-29 2011 Ian Bond | Microlensing parallelism 1/40 Need for parallelism Graphical Processor Units Gravitational Microlensing Modelling Assumptions/Purpose You are all involved in microlensing modelling and you have (or are working on) your own code this lecture shows how to get started on getting code to run on a GPU then its over to you . Ian Bond | Microlensing parallelism 2/40 Need for parallelism Graphical Processor Units Gravitational Microlensing Modelling Outline 1 Need for parallelism 2 Graphical Processor Units 3 Gravitational Microlensing Modelling Ian Bond | Microlensing parallelism 3/40 Need for parallelism Graphical Processor Units Gravitational Microlensing Modelling Paralel Computing Parallel Computing is use of multiple computers, or computers with multiple internal processors, to solve a problem at a greater computational speed than using a single computer (Wilkinson 2002). How does one achieve parallelism? Ian Bond | Microlensing parallelism 4/40 Need for parallelism Graphical Processor Units Gravitational Microlensing Modelling Grand Challenge Problems A grand challenge problem is one that cannot be solved in a reasonable amount of time with todays computers’ Examples: – Modelling large DNA structures – Global weather forecasting – N body problem (N very large) – brain simulation Has microlensing -
Dcuda: Hardware Supported Overlap of Computation and Communication
dCUDA: Hardware Supported Overlap of Computation and Communication Tobias Gysi Jeremia Bar¨ Torsten Hoefler Department of Computer Science Department of Computer Science Department of Computer Science ETH Zurich ETH Zurich ETH Zurich [email protected] [email protected] [email protected] Abstract—Over the last decade, CUDA and the underlying utilization of the costly compute and network hardware. To GPU hardware architecture have continuously gained popularity mitigate this problem, application developers can implement in various high-performance computing application domains manual overlap of computation and communication [23], [27]. such as climate modeling, computational chemistry, or machine learning. Despite this popularity, we lack a single coherent In particular, there exist various approaches [13], [22] to programming model for GPU clusters. We therefore introduce overlap the communication with the computation on an inner the dCUDA programming model, which implements device- domain that has no inter-node data dependencies. However, side remote memory access with target notification. To hide these code transformations significantly increase code com- instruction pipeline latencies, CUDA programs over-decompose plexity which results in reduced real-world applicability. the problem and over-subscribe the device by running many more threads than there are hardware execution units. Whenever a High-performance system design often involves trading thread stalls, the hardware scheduler immediately proceeds with off sequential performance against parallel throughput. The the execution of another thread ready for execution. This latency architectural difference between host and device processors hiding technique is key to make best use of the available hardware perfectly showcases the two extremes of this design space. -
Enabling Efficient Use of UPC and Openshmem PGAS Models on GPU Clusters
Enabling Efficient Use of UPC and OpenSHMEM PGAS Models on GPU Clusters Presented at GTC ’15 Presented by Dhabaleswar K. (DK) Panda The Ohio State University E-mail: [email protected] hCp://www.cse.ohio-state.edu/~panda Accelerator Era GTC ’15 • Accelerators are becominG common in hiGh-end system architectures Top 100 – Nov 2014 (28% use Accelerators) 57% use NVIDIA GPUs 57% 28% • IncreasinG number of workloads are beinG ported to take advantage of NVIDIA GPUs • As they scale to larGe GPU clusters with hiGh compute density – hiGher the synchronizaon and communicaon overheads – hiGher the penalty • CriPcal to minimize these overheads to achieve maximum performance 3 Parallel ProGramminG Models Overview GTC ’15 P1 P2 P3 P1 P2 P3 P1 P2 P3 LoGical shared memory Shared Memory Memory Memory Memory Memory Memory Memory Shared Memory Model Distributed Memory Model ParPPoned Global Address Space (PGAS) DSM MPI (Message PassinG Interface) Global Arrays, UPC, Chapel, X10, CAF, … • ProGramminG models provide abstract machine models • Models can be mapped on different types of systems - e.G. Distributed Shared Memory (DSM), MPI within a node, etc. • Each model has strenGths and drawbacks - suite different problems or applicaons 4 Outline GTC ’15 • Overview of PGAS models (UPC and OpenSHMEM) • Limitaons in PGAS models for GPU compuPnG • Proposed DesiGns and Alternaves • Performance Evaluaon • ExploiPnG GPUDirect RDMA 5 ParPPoned Global Address Space (PGAS) Models GTC ’15 • PGAS models, an aracPve alternave to tradiPonal message passinG - Simple -
Computer Systems Architecture
CS 352H: Computer Systems Architecture Topic 14: Multicores, Multiprocessors, and Clusters University of Texas at Austin CS352H - Computer Systems Architecture Fall 2009 Don Fussell Introduction Goal: connecting multiple computers to get higher performance Multiprocessors Scalability, availability, power efficiency Job-level (process-level) parallelism High throughput for independent jobs Parallel processing program Single program run on multiple processors Multicore microprocessors Chips with multiple processors (cores) University of Texas at Austin CS352H - Computer Systems Architecture Fall 2009 Don Fussell 2 Hardware and Software Hardware Serial: e.g., Pentium 4 Parallel: e.g., quad-core Xeon e5345 Software Sequential: e.g., matrix multiplication Concurrent: e.g., operating system Sequential/concurrent software can run on serial/parallel hardware Challenge: making effective use of parallel hardware University of Texas at Austin CS352H - Computer Systems Architecture Fall 2009 Don Fussell 3 What We’ve Already Covered §2.11: Parallelism and Instructions Synchronization §3.6: Parallelism and Computer Arithmetic Associativity §4.10: Parallelism and Advanced Instruction-Level Parallelism §5.8: Parallelism and Memory Hierarchies Cache Coherence §6.9: Parallelism and I/O: Redundant Arrays of Inexpensive Disks University of Texas at Austin CS352H - Computer Systems Architecture Fall 2009 Don Fussell 4 Parallel Programming Parallel software is the problem Need to get significant performance improvement Otherwise, just use a faster uniprocessor,