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test_prefix_sum.cpp
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375 lines (276 loc) · 9.92 KB
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#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#include <emscripten/bind.h>
#endif
#include <functional>
#include <iostream>
#include <sstream>
#include <iterator>
#include <numeric>
#include <vector>
#include "test_case_with_time_measurements.h"
#include "test_pattern_generation.h"
namespace PrefixSum {
template<class T>
class TestCasePrefixSum : public TestCaseWithTimeMeasurements {
static constexpr double DIST_PASSING_THRESHOLD = 1.0e-6;
protected:
const size_t m_num_elements;
const T* m_in;
T* m_out;
double m_dist_from_baseline;
public:
TestCasePrefixSum( const string& case_name, const size_t num_elements )
:TestCaseWithTimeMeasurements { case_name }
,m_num_elements { num_elements }
,m_dist_from_baseline { 0.0 }
{
;
}
virtual ~TestCasePrefixSum()
{
;
}
void calculateDistance( const T* baseline )
{
double sum = 0.0;
m_out = getOut();
for ( size_t i = 0; i < m_num_elements; i++ ) {
sum += fabs( (double)( m_out[i] - baseline[i] ) );
}
const auto dist = sum / ( double )( m_num_elements );
this->setDist( dist );
this->setTrueFalse( (dist < DIST_PASSING_THRESHOLD) ? true : false );
}
virtual void setIn ( const T* const in ){ m_in = in; }
virtual void setOut ( T* const out ){ m_out = out; }
virtual T* getOut() { return m_out; }
virtual void copyBackOut() { ; }
virtual void run() = 0;
};
template<class T>
class TestCasePrefixSum_baseline : public TestCasePrefixSum<T> {
protected:
const int m_factor_loop_unrolling;
public:
TestCasePrefixSum_baseline( const string& case_name, const size_t num_elements, const int factor_loop_unrolling )
:TestCasePrefixSum<T> { case_name, num_elements }
,m_factor_loop_unrolling{ factor_loop_unrolling }
{
assert( factor_loop_unrolling == 1
|| factor_loop_unrolling == 2
|| factor_loop_unrolling == 4
|| factor_loop_unrolling == 8 );
}
virtual ~TestCasePrefixSum_baseline()
{
;
}
void run()
{
if ( m_factor_loop_unrolling == 1 ) {
T sum = 0;
for ( size_t i = 0; i < this->m_num_elements ; i++ ) {
this->m_out[ i ] = this->m_in[ i ] + sum ;
sum = this->m_out[ i ];
}
}
else if ( m_factor_loop_unrolling == 2 ) {
T sum = 0;
size_t i;
for ( i = 0; i < this->m_num_elements - 2 ; i+= 2 ) {
this->m_out[ i ] = this->m_in[ i ] + sum ;
this->m_out[ i + 1 ] = this->m_in[ i ] + this->m_in[ i + 1 ] + sum ;
sum = this->m_out[i+1];
}
for ( ; i < this->m_num_elements ; i++ ) {
this->m_out[ i ] = this->m_in[ i ] + sum ;
sum = this->m_out[ i ];
}
}
else if ( m_factor_loop_unrolling == 4 ) {
T sum = 0;
size_t i;
for ( i = 0; i < this->m_num_elements - 4 ; i+= 4 ) {
this->m_out[i ] = this->m_in[i] + sum ;
this->m_out[i+1] = this->m_in[i] + this->m_in[i+1] + sum ;
this->m_out[i+2] = this->m_in[i] + this->m_in[i+1] + this->m_in[i+2] + sum ;
this->m_out[i+3] = this->m_in[i] + this->m_in[i+1] + this->m_in[i+2] + this->m_in[i+3] + sum ;
sum = this->m_out[i+3];
}
for ( ; i < this->m_num_elements ; i++ ) {
this->m_out[i] = this->m_in[i] + sum ;
sum = this->m_out[i];
}
}
else if ( m_factor_loop_unrolling == 8 ) {
T sum = 0;
size_t i;
for ( i = 0; i < this->m_num_elements - 8 ; i+= 8 ) {
this->m_out[i ] = this->m_in[i] + sum ;
this->m_out[i+1] = this->m_in[i] + this->m_in[i+1] + sum ;
this->m_out[i+2] = this->m_in[i] + this->m_in[i+1] + this->m_in[i+2] + sum ;
this->m_out[i+3] = this->m_in[i] + this->m_in[i+1] + this->m_in[i+2] + this->m_in[i+3] + sum ;
this->m_out[i+4] = this->m_in[i] + this->m_in[i+1] + this->m_in[i+2] + this->m_in[i+3]
+ this->m_in[i+4] + sum ;
this->m_out[i+5] = this->m_in[i] + this->m_in[i+1] + this->m_in[i+2] + this->m_in[i+3]
+ this->m_in[i+4] + this->m_in[i+5] + sum ;
this->m_out[i+6] = this->m_in[i] + this->m_in[i+1] + this->m_in[i+2] + this->m_in[i+3]
+ this->m_in[i+4] + this->m_in[i+5] + this->m_in[i+6] + sum ;
this->m_out[i+7] = this->m_in[i] + this->m_in[i+1] + this->m_in[i+2] + this->m_in[i+3]
+ this->m_in[i+4] + this->m_in[i+5] + this->m_in[i+6] + this->m_in[i+7] + sum ;
sum = this->m_out[i+7];
}
for ( ; i < this->m_num_elements ; i++ ) {
this->m_out[i] = this->m_in[i] + sum ;
sum = this->m_out[i];
}
}
}
};
template<class T>
class TestCasePrefixSum_stdcpp : public TestCasePrefixSum<T> {
protected:
vector<T> m_in_vector;
vector<T> m_out_vector;
public:
TestCasePrefixSum_stdcpp( const string& case_name, const size_t num_elements )
:TestCasePrefixSum<T>{ case_name, num_elements }
{
;
}
virtual ~TestCasePrefixSum_stdcpp()
{
;
}
virtual void run() {
std::inclusive_scan( m_in_vector.begin(), m_in_vector.end(), m_out_vector.begin() );
}
virtual void setIn( const T* const in )
{
TestCasePrefixSum<T>::setIn( in );
m_in_vector.clear();
for ( int i = 0; i < this->m_num_elements; i++ ) {
m_in_vector.push_back( this->m_in[ i ] );
}
}
virtual void setOut( T* const out )
{
TestCasePrefixSum<T>::setOut( out );
m_out_vector.clear();
for ( int i = 0; i < this->m_num_elements; i++ ) {
m_out_vector.push_back( 0.0 );
}
}
virtual T* getOut()
{
for ( int i = 0; i < this->m_num_elements; i++ ) {
this->m_out[ i ] = m_out_vector[ i ];
}
return TestCasePrefixSum<T>::getOut();
}
};
template <class T>
class TestExecutorPrefixSum : public TestExecutor {
protected:
const bool m_repeatable;
default_random_engine m_e;
T* m_in;
T* m_out;
T* m_out_baseline;
public:
TestExecutorPrefixSum(
TestResults& results,
const int num_elements,
const int num_trials,
const bool repeatable,
const T min_val,
const T max_val
)
:TestExecutor { results, num_elements, num_trials }
,m_repeatable { repeatable }
,m_e { static_cast<unsigned int>( repeatable ? 0 : chrono::system_clock::now().time_since_epoch().count() ) }
,m_in { new T[num_elements] }
,m_out { new T[num_elements] }
,m_out_baseline{ new T[num_elements] }
{
fillArrayWithRandomValues( m_e, m_in, m_num_elements, min_val, max_val );
}
virtual ~TestExecutorPrefixSum()
{
delete[] m_in;
delete[] m_out;
delete[] m_out_baseline;
}
void cleanupAfterBatchRuns ( const int test_case )
{
auto t = dynamic_pointer_cast< TestCasePrefixSum <T> >( this->m_test_cases[ test_case ] );
if ( test_case == 0 ) {
memcpy( m_out_baseline , t->getOut(), sizeof(T)*m_num_elements );
}
t->calculateDistance( m_out_baseline );
}
void prepareForRun ( const int test_case, const int num )
{
auto t = dynamic_pointer_cast< TestCasePrefixSum<T> >( this->m_test_cases[ test_case ] );
memset( m_out, 0, sizeof(T) * this->m_num_elements );
t->setIn ( m_in );
t->setOut ( m_out );
}
};
static const size_t NUM_TRIALS = 100;
static size_t nums_elements[]{ 32, 128, 512, 2*1024, 8* 1024, 32*1024, 128*1024, 512*1024 };
template<class T>
string testSuitePerType ( const bool print_diag )
{
vector< string > case_names {
"plain c++ loop unrolled order 1",
"plain c++ loop unrolled order 2",
"plain c++ loop unrolled order 4",
"plain c++ loop unrolled order 8",
"std::inclusive_scan()",
};
vector< string > header_line {
"vector length",
"32",
"128",
"512",
"2K",
"8K",
"32K",
"128K",
"512K"
};
TestResults results{ case_names, header_line };
for( auto num_elements : nums_elements ) {
TestExecutorPrefixSum<T> e( results, num_elements, NUM_TRIALS, false, 0, 10 );
e.addTestCase( make_shared< TestCasePrefixSum_baseline <T> > ( case_names[0], num_elements, 1 ) );
e.addTestCase( make_shared< TestCasePrefixSum_baseline <T> > ( case_names[1], num_elements, 2 ) );
e.addTestCase( make_shared< TestCasePrefixSum_baseline <T> > ( case_names[2], num_elements, 4 ) );
e.addTestCase( make_shared< TestCasePrefixSum_baseline <T> > ( case_names[3], num_elements, 8 ) );
e.addTestCase( make_shared< TestCasePrefixSum_stdcpp <T> > ( case_names[4], num_elements ) );
e.execute( print_diag );
}
std::stringstream ss;
results.printHTML( ss );
return ss.str();
}
} // namespace PrefixSum
#ifdef __EMSCRIPTEN__
string testPrefixSum()
{
return PrefixSum::testSuitePerType<int>( true );
}
EMSCRIPTEN_BINDINGS( prefix_sum_module ) {
emscripten::function( "testPrefixSum", &testPrefixSum );
}
#else
int main(int argc, char* argv[])
{
const bool print_diag = (argc == 2);
cout << "prefix sum (int)\n\n";
cout << PrefixSum::testSuitePerType<int>( print_diag );
cout << "\n\n";
return 0;
}
#endif