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2402-pcluster-threads
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#include <chrono> | |
#include <iostream> | |
#include <thread> | |
#include <unistd.h> | |
#include <vector> | |
void whoami(int i) { | |
int sleep_ms = rand() % 5000; | |
std::thread::id this_id = std::this_thread::get_id(); | |
std::cout << "Thread " << i << ": " << this_id << " hello" << std::endl; | |
std::this_thread::sleep_for(std::chrono::milliseconds(sleep_ms)); | |
std::cout << "Thread " << i << ": " << this_id << " goodbye" << std::endl; | |
} | |
int getThreads(void) { | |
const auto processor_count = std::thread::hardware_concurrency(); | |
std::cout << processor_count << " threads available" << std::endl; | |
return processor_count; | |
} | |
float getMemory() { | |
long pages = sysconf(_SC_PHYS_PAGES); | |
long page_size = sysconf(_SC_PAGE_SIZE); | |
float system_memory_gib = (pages * page_size) / std::pow(1024, 3); | |
std::cout << "System memory GiB: " << std::setprecision(3) << system_memory_gib << std::endl; | |
return system_memory_gib; | |
} | |
int main(int argc, char const *argv[]) { | |
int nthreads; | |
std::vector<std::thread> threads = {}; | |
getMemory(); | |
nthreads = getThreads(); | |
for (int i = 0; i < nthreads; i++) { | |
threads.push_back(std::thread(whoami, i)); | |
} | |
for (int i = 0; i < nthreads; i++) { | |
threads[i].join(); | |
} | |
return 0; | |
} |
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#!/bin/bash | |
#SBATCH --job-name="param_boot_r5a-2xl" | |
#SBATCH --ntasks=1 | |
#SBATCH --time=96:00:00 | |
#SBATCH --cpus-per-task=8 | |
#SBATCH --ntasks-per-node=1 | |
#SBATCH --exclusive | |
#SBATCH --output="param_boot_%A_%a.log" | |
#SBATCH --error="param_boot_%A_%a.err" | |
#SBATCH --array=[1-10] | |
#SBATCH --partition=r5a-2xl | |
mpirun ./multithread_01 |
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