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#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "lf_ring_buffer.h"
#define BUFFER_LEN 5000000
//static rb_data_t data[BUFFER_LEN][RB_DATA_LEN];
static int64_t time_diff(struct timespec *t0, struct timespec *t1)
{
return ((t1->tv_sec * 1000000000) + t1->tv_nsec) - ((t0->tv_sec * 1000000000) + t0->tv_nsec);
}
/*
static void print_now(char* s) {
fprintf(stdout,s);
fflush(stdout);
}
*/
static void report( char* op, int n, uint64_t dt, int redo ) {
fprintf(stdout,"\t%9d %s operations in %4d [ms] => %7d [us] => %10d [ns]\t >>> %6d [ns/op]\t%4d redone operations\n",
n, op, (int)(dt/1000000), (int)(dt/1000), (int)dt, (int)(dt/n), redo );
}
struct thread_params {
lf_ring_buffer_t *ring;
int n;
int flags;
};
/*
static void feed_data( int n){
int i;
for(i=0; i<n; i++){
sprintf(data[i],"hello world %04d\n",i);
}
}
*/
static uint64_t sequential_writes( lf_ring_buffer_t *ring, int n, int flags ) {
int i, redo=0;
rb_data_t data[RB_DATA_LEN];
struct timespec start, end;
clock_gettime(CLOCK_MONOTONIC, &start);
if(flags==0) {
for(i=0; i<n; i++) lf_ring_buffer_write( ring, data, flags );
} else {
for(i=0; i<n;) {
if(lf_ring_buffer_write( ring, data, flags )==0) { i++; } else { redo+=1; }
}
}
clock_gettime(CLOCK_MONOTONIC, &end);
report( "write", n, time_diff( &start, &end ), redo );
return time_diff( &start, &end );
}
static uint64_t sequential_reads( lf_ring_buffer_t *ring, int n, int flags ) {
int i,redo=0;
rb_data_t data[RB_DATA_LEN];
struct timespec start, end;
clock_gettime(CLOCK_MONOTONIC, &start);
for(i=0; i<n;) {
if(lf_ring_buffer_read( ring, data, flags )==0) { i++; } else { redo+=1; }
}
clock_gettime(CLOCK_MONOTONIC, &end);
report( "read ", n, time_diff( &start, &end ), redo );
return time_diff( &start, &end );
}
void* writer_thread( void* param ) {
struct thread_params *params = (struct thread_params*)param;
//report( "write", params->n, sequential_writes( params->ring, params->n, params->flags ) );
sequential_writes( params->ring, params->n, params->flags );
return NULL;
}
void* reader_thread( void* param ) {
struct thread_params *params = (struct thread_params*)param;
//report( "read ", params->n, sequential_reads( params->ring, params->n, params->flags ) );
sequential_reads( params->ring, params->n, params->flags );
return NULL;
}
static void parallel_op( int op, int nt, lf_ring_buffer_t *ring, int n, int flags ) {
int i;
pthread_t *threads = malloc( sizeof(pthread_t)*nt);
struct thread_params *params = malloc( sizeof(struct thread_params)*nt);
for(i=0; i<nt; i++) {
params[i].ring = ring;
params[i].n = n/nt;
params[i].flags = flags;
if(op==0) {
if (pthread_create( &threads[i], NULL, writer_thread, ¶ms[i])) {
fprintf(stderr,"Failed to create writer thread[%d]\n",i);
exit(1);
}
} else if(op==1) {
if (pthread_create( &threads[i], NULL, reader_thread, ¶ms[i])) {
fprintf(stderr,"Failed to create reader thread[%d]\n",i);
exit(1);
}
} else {
params[i].n /=2;
if (pthread_create( &threads[i], NULL, writer_thread, ¶ms[i])) {
fprintf(stderr,"Failed to create writer thread[%d]\n",i);
exit(1);
}
if (pthread_create( &threads[i], NULL, reader_thread, ¶ms[i])) {
fprintf(stderr,"Failed to create reader thread[%d]\n",i);
exit(1);
}
}
}
for(i=0; i<nt; i++) {
pthread_join( threads[i], NULL );
}
/* empty the ring */
free(threads);
free(params);
}
int main( int argc, char** argv ) {
int i;
int b_len = BUFFER_LEN;
lf_ring_buffer_t *ring;
ring = lf_ring_buffer_create( b_len );
if(ring==NULL){
fprintf(stderr,"ERROR : lf_ring_buffer_create( %d );\n",b_len);
exit( EXIT_FAILURE );
}
/*
print_now("feed the data ... ");
feed_data(b_len);
printf("done.\n");
*/
printf("sequential non blocking write operations ...\n");
//report( "write", b_len, sequential_writes( ring, b_len, 0 ) );
sequential_writes( ring, b_len, 0 );
printf("sequential non blocking read operations ...\n");
//report( "read ", b_len, sequential_reads( ring, b_len, 0 ) );
sequential_reads( ring, b_len, 0 );
printf("sequential blocking write operations ...\n");
//report( "write", b_len, sequential_writes( ring, b_len, 0 ) );
sequential_writes( ring, b_len, LFRB_NO_BLOCK );
printf("sequential blocking read operations ...\n");
//report( "read ", b_len, sequential_reads( ring, b_len, 0 ) );
sequential_reads( ring, b_len, LFRB_NO_BLOCK );
for(i=5; i<=100;i*=2) {
printf("%d parallel blocking with backoff inc write operations .... \n",i);
parallel_op( 0, i, ring, b_len, 0 );
printf("parallel blocking read operations ...\n");
sequential_reads( ring, b_len, 0 );
}
for(i=5; i<=100;i*=2) {
printf("%d parallel non blocking write operations .... \n",i);
parallel_op( 0, i, ring, b_len, LFRB_NO_BLOCK );
printf("non blocking read operations ...\n");
sequential_reads( ring, b_len, LFRB_NO_BLOCK );
}
for(i=10; i<=100;i*=2) {
printf("%d parallel blocking write and read operations .... \n",i*2);
parallel_op( 3, i, ring, b_len, 0 );
}
lf_ring_buffer_destroy( ring );
return EXIT_SUCCESS;
}
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