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dalvarez |
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/*****************************************************************************/
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/* */
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/* Copyright (c) 2008, 2009, 2010 */
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/* Computer Architecture Group (CAG) */
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/* University of A Coruña, Spain */
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/* (http://gac.des.udc.es) */
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/* Galicia Supercomputing Center (CESGA) */
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/* (http://www.cesga.es) */
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/* Hewlett-Packard Spain (HP) */
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/* (http://www.hp.es) */
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/* */
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/* This file is part of UPC Operations Microbenchmarking Suite (UOMS). */
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/* */
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/* UOMS is free software: you can redistribute it and/or modify */
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/* it under the terms of the GNU Lesser General Public License as published */
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/* by the Free Software Foundation, either version 3 of the License, or */
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/* (at your option) any later version. */
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/* */
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/* UOMS is distributed in the hope that it will be useful, */
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/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
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/* GNU Lesser General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU Lesser General Public License */
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/* along with UOMS. If not, see <http://www.gnu.org/licenses/>. */
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/* */
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/*****************************************************************************/
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/*****************************************************************************/
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/* */
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/* FUNDING: This development has been funded by Hewlett-Packard Spain */
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/* */
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/* Project Name: */
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/* UPCHACO (2008-2011) */
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/* Subproject: */
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/* Improving UPC Usability and Performance in Constellation Systems: */
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/* Implementation/Extensions of UPC Libraries. */
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/* (UPCPUProject -> UPC Performance and Usability Project) */
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/* */
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/*****************************************************************************/
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/*****************************************************************************
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For further documentation, see
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[1] Files under doc/
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******************************************************************************/
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#include <sched.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "headers.h" |
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#include "defines.h" |
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/*
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Affinity related functions
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*/
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extern FILE *unit;
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extern int minsize, maxsize;
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void UOMS_coreaffinity_info(int core0, int core1, long total){
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int i;
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char *smask0;
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char *smask1;
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cpu_set_t mask0, mask1;
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CPU_ZERO(&mask0);
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CPU_ZERO(&mask1);
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CPU_SET(core0 + 0*(core1-core0),&mask0);
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CPU_SET(core0 + 1*(core1-core0),&mask1);
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smask0 = malloc(sizeof(char)*(total+1));
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smask1 = malloc(sizeof(char)*(total+1));
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for(i=0;i<total;i++){
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if(CPU_ISSET(i,&mask0))
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smask0[i] = '1';
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else
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smask0[i] = '0';
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if(CPU_ISSET(i,&mask1))
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smask1[i] = '1';
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else
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smask1[i] = '0';
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}
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smask0[total] = '\0';
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smask1[total] = '\0';
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fprintf(unit,"\n");
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fprintf(unit,"#---------------------------------------------------------\n");
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fprintf(unit,"# using #cores = %d and %d (Number of cores per node: %ld)\n",core0,core1,total);
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fprintf(unit,"# CPU Mask: %s (core %d), %s (core %d)\n",smask0,core0,smask1,core1);
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fprintf(unit,"#---------------------------------------------------------\n");
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fprintf(unit,"\n");
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free(smask0);
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free(smask1);
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}
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/*
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Study the UPC performance fixing the affinity of the UPC THREADS
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to specific cores
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*/
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void affinity_bench(int operation_code){
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long num_cores;
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cpu_set_t mask;
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int cpu, core0, core1;
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int i;
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/*
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Determine the number of cores
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*/
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#ifndef NUMCORES
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num_cores = sysconf(_SC_NPROCESSORS_ONLN);
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#else
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num_cores = NUMCORES;
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#endif
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if(num_cores < 1){
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if(!MYTHREAD)
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printf("Unable to determine the correct number of cores\n");
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return;
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}
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/*
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This code will test communications using core 0 with power-of-2 cores
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and core [num_cores/2] with power-of-2+num_cores/2 cores
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This way it will perform a couple of redundant tests, but it will
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also test all the important configurations from locality perspective
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in NUMA machines
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The second part of the code (core [num_cores/2] with
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power-of-2+num_cores/2 cores) is only important when testing communications
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between 2 nodes, being each one a NUMA machine with the network
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interface attached to just one cell
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*/
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if(num_cores >= 4){
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for(i = 1; i<=num_cores/2; i*=2){
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//First part
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core0 = 0;
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core1 = i;
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CPU_ZERO(&mask);
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if (!MYTHREAD)
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UOMS_coreaffinity_info(core0,core1,num_cores);
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cpu = core0 + MYTHREAD*(core1-core0);
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CPU_SET(cpu,&mask);
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sched_setaffinity(0,sizeof(cpu_set_t),&mask);
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bench(operation_code);
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//Second part
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core0 = num_cores/2;
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core1 = core0 + i;
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if(core1 >= num_cores)
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continue;
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CPU_ZERO(&mask);
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if (!MYTHREAD)
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UOMS_coreaffinity_info(core0,core1,num_cores);
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cpu = core0 + MYTHREAD*(core1-core0);
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CPU_SET(cpu,&mask);
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sched_setaffinity(0,sizeof(cpu_set_t),&mask);
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bench(operation_code);
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}
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}
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else{
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/*
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For completition, this code test mono and dual-core machines
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*/
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core0 = 0;
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if(num_cores < 2)
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core1 = 0;
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else
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core1 = 1;
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CPU_ZERO(&mask);
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if (!MYTHREAD)
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UOMS_coreaffinity_info(core0,core1,num_cores);
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cpu = core0 + MYTHREAD*core1;
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CPU_SET(cpu,&mask);
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sched_setaffinity(0,sizeof(cpu_set_t),&mask);
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bench(operation_code);
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}
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}
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