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- #include <iostream>
- #include <vector>
- #include <pthread.h>
- #include <sys/time.h>
- #include <stdio.h>
- #include <stdlib.h>
- double CpuFrequency=3601.0; // CPU frequency in MHz
- pthread_cond_t cv;
- pthread_mutex_t m;
- pthread_t thread2;
- struct timeval before, after;
- typedef unsigned long long ticks;
- unsigned long long beforeTicks, afterTicks;
- static __inline__ ticks getrdtsc()
- {
- unsigned a, d;
- // asm("cpuid"); // We don't need to cause a pipeline stall for this test
- asm volatile("rdtsc" : "=a" (a), "=d" (d));
- return (((ticks)a) | (((ticks)d) << 32));
- }
- void *beginthread2(void *v)
- {
- for (;;)
- {
- // Wait for a signal from thread 1
- pthread_mutex_lock(&m);
- pthread_cond_wait(&cv, &m);
- // Some dequeue op would normally be performed here after a spurious wake
- // up test
- // Get the ending ticks
- afterTicks=getrdtsc();
- pthread_mutex_unlock(&m);
- // Display the time elapsed
- std::cout << "Ticks elapsed: " << afterTicks-beforeTicks << " ("
- << (afterTicks-beforeTicks)/CpuFrequency << " us)\n";
- }
- return NULL;
- }
- int main(int argc, char *argv[])
- {
- int core1=0, core2=0;
- if (argc < 3)
- {
- std::cout << "Usage: " << argv[0] << " producer_corenum consumer_corenum" << std::endl;
- return 1;
- }
- // Get core numbers on which to perform the test
- core1 = atoi(argv[1]);
- core2 = atoi(argv[2]);
- std::cout << "Core 1: " << core1 << std::endl;
- std::cout << "Core 2: " << core2 << std::endl;
- pthread_mutex_init(&m, NULL);
- pthread_cond_init(&cv, NULL);
- cpu_set_t cpuset;
- CPU_ZERO(&cpuset);
- CPU_SET(core1, &cpuset);
- // Set affinity of the first (current) thread to core1
- pthread_t self=pthread_self();
- if (pthread_setaffinity_np(self, sizeof(cpu_set_t), &cpuset)!=0)
- {
- perror("pthread_setaffinity_np");
- return 1;
- }
- CPU_ZERO(&cpuset);
- CPU_SET(core2, &cpuset);
- // Create second thread
- pthread_create(&thread2, NULL, beginthread2, NULL);
- // Set affinity of the second thread to core2
- if (pthread_setaffinity_np(thread2, sizeof(cpu_set_t), &cpuset)!=0)
- {
- perror("pthread_setaffinity_np");
- return 1;
- }
- // Run the test
- for (;;)
- {
- // Sleep for one second
- sleep(1);
- // Get the starting ticks
- beforeTicks=getrdtsc();
- // Signal thread 2
- pthread_mutex_lock(&m);
- // Some enqueue op would normally be performed here
- pthread_cond_signal(&cv);
- pthread_mutex_unlock(&m);
- }
- }
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