what is the output produced on the following code and what is a brief description of it (make file below code):

// echo 0 > /sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/enable // echo 1 > /sys/devices/system/cpu/cpu1/online // echo 1 > /sys/devices/system/cpu/cpu2/online // echo 1 > /sys/devices/system/cpu/cpu3/online #define _GNU_SOURCE #include  #include  #include  #include  #include  #define NUM_THREADS (4) #define NUM_CPUS (1) #define NSEC_PER_SEC (1000000000) #define NSEC_PER_MSEC (1000000) #define NSEC_PER_MICROSEC (1000) #define DELAY_TICKS (1) #define ERROR (-1) #define OK (0) unsigned int idx = 0, jdx = 1; unsigned int seqIterations = 47; unsigned int reqIterations = 10000000; volatile unsigned int fib = 0, fib0 = 0, fib1 = 1; int numberOfProcessors; #define FIB_TEST(seqCnt, iterCnt) \ for(idx=0; idx < iterCnt; idx++) \ { \ fib = fib0 + fib1; \ while(jdx < seqCnt) \ { \ fib0 = fib1; \ fib1 = fib; \ fib = fib0 + fib1; \ jdx++; \ } \ } \ typedef struct { int threadIdx; } threadParams_t; // POSIX thread declarations and scheduling attributes // pthread_t threads[NUM_THREADS]; threadParams_t threadParams[NUM_THREADS]; pthread_attr_t rt_sched_attr[NUM_THREADS]; int rt_max_prio, rt_min_prio; struct sched_param rt_param[NUM_THREADS]; struct sched_param main_param; pthread_attr_t main_attr; pid_t mainpid; int delta_t(struct timespec *stop, struct timespec *start, struct timespec *delta_t) { int dt_sec=stop->tv_sec - start->tv_sec; int dt_nsec=stop->tv_nsec - start->tv_nsec; if(dt_sec >= 0) { if(dt_nsec >= 0) { delta_t->tv_sec=dt_sec; delta_t->tv_nsec=dt_nsec; } else { delta_t->tv_sec=dt_sec-1; delta_t->tv_nsec=NSEC_PER_SEC+dt_nsec; } } else { if(dt_nsec >= 0) { delta_t->tv_sec=dt_sec; delta_t->tv_nsec=dt_nsec; } else { delta_t->tv_sec=dt_sec-1; delta_t->tv_nsec=NSEC_PER_SEC+dt_nsec; } } return(1); } void *counterThread(void *threadp) { int sum=0, i, cpucore; pthread_t thread; cpu_set_t cpuset; struct timespec start_time = {0, 0}; struct timespec finish_time = {0, 0}; struct timespec thread_dt = {0, 0}; threadParams_t *threadParams = (threadParams_t *)threadp; clock_gettime(CLOCK_REALTIME, &start_time); thread=pthread_self(); cpucore=sched_getcpu(); CPU_ZERO(&cpuset); pthread_getaffinity_np(thread, sizeof(cpu_set_t), &cpuset); // COMPUTE SECTION for(i=1; i < (((threadParams->threadIdx)+1)*100); i++) sum=sum+i; FIB_TEST(seqIterations, reqIterations); // END COMPUTE SECTION printf(" Thread idx=%d, sum[0...%d]=%d ", threadParams->threadIdx, ((threadParams->threadIdx)+1)*100, sum); printf("Thread idx=%d ran on core=%d, affinity contained:", threadParams->threadIdx, cpucore); for(i=0; ithreadIdx, thread_dt.tv_sec, (thread_dt.tv_nsec / NSEC_PER_MSEC), (thread_dt.tv_nsec / NSEC_PER_MICROSEC)); pthread_exit(&sum); } void print_scheduler(void) { int schedType; schedType = sched_getscheduler(getpid()); switch(schedType) { case SCHED_FIFO: printf("Pthread Policy is SCHED_FIFO "); break; case SCHED_OTHER: printf("Pthread Policy is SCHED_OTHER "); break; case SCHED_RR: printf("Pthread Policy is SCHED_OTHER "); break; default: printf("Pthread Policy is UNKNOWN "); } } int main (int argc, char *argv[]) { int rc; int i, scope, idx; cpu_set_t allcpuset; cpu_set_t threadcpu; int coreid; printf("This system has %d processors configured and %d processors available. ", get_nprocs_conf(), get_nprocs()); numberOfProcessors = get_nprocs_conf(); printf("number of CPU cores=%d ", numberOfProcessors); CPU_ZERO(&allcpuset); for(i=0; i < numberOfProcessors; i++) CPU_SET(i, &allcpuset); if(numberOfProcessors >= NUM_CPUS) printf("Using sysconf number of CPUS=%d, count in set=%d ", numberOfProcessors, CPU_COUNT(&allcpuset)); else { numberOfProcessors=NUM_CPUS; printf("Using DEFAULT number of CPUS=%d ", numberOfProcessors); } mainpid=getpid(); rt_max_prio = sched_get_priority_max(SCHED_FIFO); rt_min_prio = sched_get_priority_min(SCHED_FIFO); print_scheduler(); rc=sched_getparam(mainpid, &main_param); main_param.sched_priority=rt_max_prio; rc=sched_setscheduler(getpid(), SCHED_FIFO, &main_param); if(rc < 0) perror("main_param"); print_scheduler(); pthread_attr_getscope(&main_attr, &scope); if(scope == PTHREAD_SCOPE_SYSTEM) printf("PTHREAD SCOPE SYSTEM "); else if (scope == PTHREAD_SCOPE_PROCESS) printf("PTHREAD SCOPE PROCESS "); else printf("PTHREAD SCOPE UNKNOWN "); printf("rt_max_prio=%d ", rt_max_prio); printf("rt_min_prio=%d ", rt_min_prio); for(i=0; i < NUM_THREADS; i++) { CPU_ZERO(&threadcpu); coreid=i%numberOfProcessors; printf("Setting thread %d to core %d ", i, coreid); CPU_SET(coreid, &threadcpu); for(idx=0; idx 
 
 
INCLUDE_DIRS = LIB_DIRS = CC=gcc CDEFS= CFLAGS= -O0 -g $(INCLUDE_DIRS) $(CDEFS) LIBS= HFILES= CFILES= pthread.c SRCS= ${HFILES} ${CFILES} OBJS= ${CFILES:.c=.o} all: pthread clean: -rm -f *.o *.d -rm -f pthread pthread: pthread.o $(CC) $(LDFLAGS) $(CFLAGS) -o $@ $@.o -lpthread depend: .c.o: $(CC) $(CFLAGS) -c $<