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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 <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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/* Get clock ticks */
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uint64_t getTicks() {
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#ifdef __ia64
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#ifdef __INTEL_COMPILER
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#include <ia64intrin.h>
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return (uint64_t)__getReg(_IA64_REG_AR_ITC);
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#else
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uint64_t ret = 0;
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__asm__ __volatile__("mov %0=ar.itc" : "=r"(ret) );
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return ret;
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#endif
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#else
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#ifdef __HP_UPC_VER
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return hpupc_ticks_now();
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#elif __BERKELEY_UPC__
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return bupc_ticks_now();
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#else
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uint64_t tstamp;
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struct timeval tv;
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if (gettimeofday(&tv, NULL)) {
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perror("gettimeofday");
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abort();
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}
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tstamp = (((uint64_t)tv.tv_sec) * 1000000 + tv.tv_usec)*1000;
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return tstamp;
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#endif
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#endif
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}
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/* Ticks to nanoseconds */
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uint64_t ticksToNS(uint64_t ticks) {
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#ifdef __ia64
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#include <errno.h>
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double tick_rate_ns = 0;
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errno = 0;
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FILE *fp = fopen("/proc/cpuinfo","r");
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if (errno != 0){
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perror("*** Error opening /proc/cpuinfo: ");
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exit(-1);
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}
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char input[255];
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while (!feof(fp) && fgets(input, 255, fp)) {
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if (strstr(input,"itc MHz")) {
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char *p = strchr(input,':');
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double MHz = 0.0;
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if (p) MHz = atof(p+1);
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if(!(MHz > 1 && MHz < 100000)) /* ensure it looks reasonable */
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fprintf(stderr, "*** Warning: ITC frequency unreasonable: %f MHz\n*** Expect unexpected results\n",MHz);
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tick_rate_ns = 1000. / MHz;
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break;
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}
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}
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fclose(fp);
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return (ticks * tick_rate_ns);
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#else
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#ifdef __HP_UPC_VER
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return hpupc_ticks_to_ns(ticks);
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#elif __BERKELEY_UPC__
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return bupc_ticks_to_ns(ticks);
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#else // if gettimeofday is used
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return ticks;
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#endif
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#endif
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}
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