pthreads_test.md

test:

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

#define NTHREADS 15
void *thread_function(void *);

int main()
{
    pthread_t thread_id[NTHREADS];
    int i, j;

    for(i=0; i < NTHREADS; i++)
    {
        pthread_create( &thread_id[i], NULL, thread_function, NULL );
    }

    for(j=0; j < NTHREADS; j++)
    {
        pthread_join( thread_id[j], NULL);
    }
    return 0;
}

void *thread_function(void *dummyPtr)
{
    int counter=0;
    for (int i=0;i<100000/NTHREADS;i++)
        for (int j=0;j<100000;j++)
            counter++;
}

compile on SCP: gcc -o test -lpthread test.c compile on AWS: gcc -o test -pthread test.c

run: time ./test

1 worker thread:

where	real	user
SCP64coreNUMA	27.683s	27.649s
AWS48core	21.901s	21.901s
Lenovo8core	20.031s	19.987s
O2 32core	27.506s	27.519s

15 worker threads:

where	real	user	ratio
SCP64coreNUMA	6.909s	27.638s	4
AWS48core	2.227s	31.950s	14
Lenovo8core	4.854s	35.381s	7
O2 32core	27.682	27.646	1