HPL

How to build HPL with Arm Compiler for HPC.

HPL is a software package that solves a random, dense linear system in double precision (64 bit) arithmetic on distributed-memory computers. It can be regarded as a portable and freely available implementation of the High Performance Computing LINPACK Benchmark.

For the purposes of this build, the following components are used:

 Component Form
 HPL  Version 2.3
 Arm Compiler for HPC
 Version 19.1
 Arm Performance Libraries
 Version 19.1
 Open MPI
 4.0.0
 Linux distribution
 Ubuntu 16.04
 Hardware
 Cavium ThunderX2

Prerequisites

  • Installed Arm Compiler and Arm Performance Libraries. For more information, see our instructions on installing Arm Compiler for HPC.

  • Set $ARMPL_DIR to your Arm Performance Libraries installation location.


Procedure

  1. Download the HPL source from Netlib, unpack the tarball, and change into the unpacked hpl-2.3 directory:

    wget http://www.netlib.org/benchmark/hpl/hpl-2.3.tar.gz
    tar -zxvf hpl-2.3.tar.gz
    cd hpl-2.3
  2. The setup directory contains a number of config files. To build with the Arm Compiler you must generate an Arm config file. In the setup directory, use the make_generic script to generate a new config for an 'unknown' architecture, Make.UNKNOWN, then rename this to Make.Linux_Arm:

    cd setup
    source make_generic
    mv Make.UNKNOWN Make.Linux_Arm
  3. Make the following changes to Make.Linux_Arm:

    • Set the name for the architecture: ARCH = Linux_Arm.

    • Set  TOPdir to the HPL directory, for example: TOPdir = $(HOME)/hpl-2.3.

    • Unset the LA flags, LAdir, LAinc and LAlib - linking to the Arm Performance Libraries will be handled by the -armpl flag.

    • Ensure that CC = mpicc, LINKER = mpifort, and mpicc -show and mpifort -show show armclang and armflang are being invoked.

    • Set the linker flags: LINKFLAGS = -mcpu=native -armpl.

    • Set optimization flags: CCFLAGS = $(HPL_DEFS) -Ofast -mcpu=native -armpl.

  4. Move to the HPL directory and make a link to, or copy of, setup/Make.Linux_Arm:

    cd ..
    ln -s setup/Make.Linux_Arm Make.Linux_Arm 
  5. Run make, selecting arch=Linux_Arm:

    make arch=Linux_Arm
  6. Run a test.

    To run HPL over $np cores, change to the directory containing the new Linux_Arm executable, and run xhpl:

    cd bin/Linux_Arm
    mpirun -np $np ./xhpl

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