mirror of
https://github.com/ClusterCockpit/cc-backend
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89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/*
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* =======================================================================================
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*
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* Author: Jan Eitzinger (je), jan.eitzinger@fau.de
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* Copyright (c) 2019 RRZE, University Erlangen-Nuremberg
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* =======================================================================================
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*/
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#ifdef __linux__
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#ifdef _OPENMP
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#include <stdlib.h>
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#include <stdio.h>
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#include <sched.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <pthread.h>
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#include <sys/syscall.h>
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#define MAX_NUM_THREADS 128
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#define gettid() syscall(SYS_gettid)
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static int
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getProcessorID(cpu_set_t* cpu_set)
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{
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int processorId;
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for ( processorId = 0; processorId < MAX_NUM_THREADS; processorId++ )
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{
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if ( CPU_ISSET(processorId,cpu_set) )
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{
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break;
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}
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}
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return processorId;
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}
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int
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affinity_getProcessorId()
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{
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cpu_set_t cpu_set;
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CPU_ZERO(&cpu_set);
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sched_getaffinity(gettid(),sizeof(cpu_set_t), &cpu_set);
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return getProcessorID(&cpu_set);
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}
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void
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affinity_pinThread(int processorId)
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{
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cpu_set_t cpuset;
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pthread_t thread;
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thread = pthread_self();
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CPU_ZERO(&cpuset);
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CPU_SET(processorId, &cpuset);
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pthread_setaffinity_np(thread, sizeof(cpu_set_t), &cpuset);
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}
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void
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affinity_pinProcess(int processorId)
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{
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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CPU_SET(processorId, &cpuset);
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sched_setaffinity(0, sizeof(cpu_set_t), &cpuset);
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}
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#endif /*_OPENMP*/
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#endif /*__linux__*/
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