linux如何编译线程数

package main

import (
    "fmt"
    "runtime"
)

func main() {
    // 设置使用的CPU核数为4
    runtime.GOMAXPROCS(4)
    fmt.Println("GOMAXPROCS:", runtime.GOMAXPROCS(0))
}

export GOMAXPROCS=4
./your_go_program

#include <pthread.h>
#include <stdio.h>

#define NUM_THREADS 4

void* thread_function(void* arg) {
    printf("Thread %ld is running
", (long)arg);
    return NULL;
}

int main() {
    pthread_t threads[NUM_THREADS];
    for (long i = 0; i < NUM_THREADS; i++) {
        pthread_create(&threads[i], NULL, thread_function, (void*)i);
    }
    for (int i = 0; i < NUM_THREADS; i++) {
        pthread_join(threads[i], NULL);
    }
    return 0;
}

gcc -fopenmp -o your_program your_program.c
export OMP_NUM_THREADS=4
./your_program

#include <omp.h>
#include <stdio.h>

int main() {
    omp_set_num_threads(4);
    #pragma omp parallel
    {
        printf("Thread %d is running
", omp_get_thread_num());
    }
    return 0;
}