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/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Benchmark `max_view_buffer_index`.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <math.h>
#include <time.h>
#include <sys/time.h>
#include "stdlib/ndarray/base/max_view_buffer_index.h"
#define NAME "max-view-buffer-index"
#define ITERATIONS 1000000
#define REPEATS 3
/**
* Prints the TAP version.
*/
void print_version() {
printf( "TAP version 13\n" );
}
/**
* Prints the TAP summary.
*
* @param total total number of tests
* @param passing total number of passing tests
*/
void print_summary( int total, int passing ) {
printf( "#\n" );
printf( "1..%d\n", total ); // TAP plan
printf( "# total %d\n", total );
printf( "# pass %d\n", passing );
printf( "#\n" );
printf( "# ok\n" );
}
/**
* Prints benchmarks results.
*
* @param elapsed elapsed time in seconds
*/
void print_results( double elapsed ) {
double rate = (double)ITERATIONS / elapsed;
printf( " ---\n" );
printf( " iterations: %d\n", ITERATIONS );
printf( " elapsed: %0.9f\n", elapsed );
printf( " rate: %0.9f\n", rate );
printf( " ...\n" );
}
/**
* Returns a clock time.
*
* @return clock time
*/
double tic() {
struct timeval now;
gettimeofday( &now, NULL );
return (double)now.tv_sec + (double)now.tv_usec/1.0e6;
}
/**
* Generates a random double on the interval [0,1].
*
* @return random double
*/
double rand_double() {
int r = rand();
return (double)r / ( (double)RAND_MAX + 1.0 );
}
/**
* Runs a benchmark.
*
* @return elapsed time in seconds
*/
double benchmark() {
double elapsed;
int64_t n;
double t;
int i;
int64_t shape[] = { 10, 10, 10 };
int64_t strides[] = { 100, 10, 1 };
int64_t offset = 1000;
int64_t ndims = 3;
t = tic();
for ( i = 0; i < ITERATIONS; i++ ) {
strides[ 0 ] *= ( rand_double() < 0.5 ) ? 1 : -1;
n = stdlib_ndarray_max_view_buffer_index( ndims, shape, strides, offset );
if ( n > 1e10 ) {
printf( "unexpected result\n" );
break;
}
}
elapsed = tic() - t;
if ( n > 1e10 ) {
printf( "unexpected result\n" );
}
return elapsed;
}
/**
* Main execution sequence.
*/
int main( void ) {
double elapsed;
int i;
// Use the current time to seed the random number generator:
srand( time( NULL ) );
print_version();
for ( i = 0; i < REPEATS; i++ ) {
printf( "# c::native::%s\n", NAME );
elapsed = benchmark();
print_results( elapsed );
printf( "ok %d benchmark finished\n", i+1 );
}
print_summary( REPEATS, REPEATS );
}
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