Moving repeated statistics into function
This commit is contained in:
Dennis Luxen
parent
07262387e0
commit
dc920a7e39
@ -24,14 +24,9 @@ or see http://www.gnu.org/licenses/agpl.txt.
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#include <boost/filesystem.hpp>
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#include <boost/filesystem/fstream.hpp>
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#include <boost/date_time/posix_time/posix_time.hpp>
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#include <boost/thread/thread.hpp>
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#include <boost/ref.hpp>
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#include <cmath>
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#include <cstdlib>
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#include <algorithm>
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#include <numeric>
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@ -39,38 +34,60 @@ or see http://www.gnu.org/licenses/agpl.txt.
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const unsigned number_of_elements = 268435456;
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struct Statistics { double min, max, med, mean, dev; };
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void RunStatistics(std::vector<double> & timings_vector, Statistics & stats) {
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std::sort(timings_vector.begin(), timings_vector.end());
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stats.min = timings_vector.front();
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stats.max = timings_vector.back();
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stats.med = timings_vector[timings_vector.size()/2];
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double primary_sum = std::accumulate(
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timings_vector.begin(),
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timings_vector.end(),
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0.0
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);
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stats.mean = primary_sum / timings_vector.size();
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double primary_sq_sum = std::inner_product( timings_vector.begin(),
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timings_vector.end(),
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timings_vector.begin(),
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0.0
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);
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stats.dev = std::sqrt(
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primary_sq_sum / timings_vector.size() - (stats.mean * stats.mean)
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);
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}
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int main (int argc, char * argv[]) {
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LogPolicy::GetInstance().Unmute();
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SimpleLogger().Write(logDEBUG) << "starting up engines, compiled at " <<
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__DATE__ << ", " __TIME__;
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if( 1 == argc ) {
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SimpleLogger().Write(logWARNING) <<
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"usage: " << argv[0] << " /path/on/device";
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return -1;
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}
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boost::filesystem::path test_path = boost::filesystem::path(argv[1]);
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test_path /= "osrm.tst";
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SimpleLogger().Write(logDEBUG) << "temporary file: " << test_path.string();
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try {
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SimpleLogger().Write(logDEBUG) << "starting up engines, compiled at " <<
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__DATE__ << ", " __TIME__;
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if( 1 == argc ) {
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SimpleLogger().Write(logWARNING) <<
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"usage: " << argv[0] << " /path/on/device";
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return -1;
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}
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//create file to test
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boost::filesystem::path test_path = boost::filesystem::path(argv[1]);
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test_path /= "osrm.tst";
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SimpleLogger().Write(logDEBUG) <<
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"temporary file: " << test_path.string();
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if( boost::filesystem::exists(test_path) ) {
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boost::filesystem::remove(test_path);
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SimpleLogger().Write() << "removing previous files";
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}
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SimpleLogger().Write(logDEBUG) << "Allocating 2GB in RAM";
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SimpleLogger().Write(logDEBUG) << "allocating 2GB in RAM";
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std::vector<unsigned> primary_vector(number_of_elements, 0);
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std::vector<unsigned> secondary_vector(number_of_elements, 0);
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SimpleLogger().Write(logDEBUG) << "fill primary vector with data";
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std::srand ( 37337 );
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std::generate (primary_vector.begin(), primary_vector.end(), std::rand);
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std::vector<double> timing_results_1013;
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SimpleLogger().Write(logDEBUG) <<
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"writing " << number_of_elements*sizeof(unsigned) << " bytes";
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//write 1GB to random filename, time everything
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@ -85,87 +102,78 @@ int main (int argc, char * argv[]) {
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double time2 = get_timestamp();
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SimpleLogger().Write(logDEBUG) <<
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"writing 1GB took " << (time2-time1)*1000 << "ms";
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SimpleLogger().Write() << "Write performance: " <<
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1024*1024/((time2-time1)*1000) << "MB/sec";
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SimpleLogger().Write(logDEBUG) <<
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"reading " << number_of_elements*sizeof(unsigned) << " bytes";
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//read and check 1GB of random data, time everything
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boost::filesystem::ifstream read_stream(test_path, std::ios::binary);
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std::vector<unsigned> secondary_vector(number_of_elements, 0);
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boost::filesystem::ifstream read_stream( test_path, std::ios::binary );
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time1 = get_timestamp();
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read_stream.read(
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(char *)&secondary_vector[0],
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number_of_elements*sizeof(unsigned)
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);
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read_stream.sync();
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read_stream.close();
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time2 = get_timestamp();
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SimpleLogger().Write(logDEBUG) <<
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"reading 1GB took " << (time2-time1)*1000 << "ms";
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SimpleLogger().Write() << "Read performance: " <<
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1024*1024/((time2-time1)*1000) << "MB/sec";
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SimpleLogger().Write(logDEBUG) << "checking data for correctness";
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if(!std::equal(
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primary_vector.begin(),
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primary_vector.end(),
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secondary_vector.begin()
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)
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) {
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throw OSRMException("reading data failed");
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throw OSRMException("data file is corrupted");
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}
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//removing any temporary data
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std::vector<unsigned>().swap(primary_vector);
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std::vector<unsigned>().swap(secondary_vector);
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SimpleLogger().Write(logDEBUG) << "performing 1000+/-1 gapped I/Os";
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unsigned single_element = 0;
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//reopening read stream
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read_stream.open(test_path, std::ios::binary);
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SimpleLogger().Write(logDEBUG) << "running 1000+/-1 gapped I/Os of 4B";
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std::vector<double> timing_results_gapped;
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volatile unsigned single_element = 0;
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//read every 268435'th byte, time each I/O seperately
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for(unsigned i = 0; i < number_of_elements; i+=(number_of_elements/1000)) {
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for(
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int i = number_of_elements;
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i > 0 ;
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i-=(number_of_elements/1000)
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) {
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time1 = get_timestamp();
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read_stream.seekg(i*sizeof(unsigned));
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read_stream.read( (char*)&single_element, sizeof(unsigned));
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time2 = get_timestamp();
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timing_results_1013.push_back((time2-time1));
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timing_results_gapped.push_back((time2-time1));
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}
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//Do statistics
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SimpleLogger().Write(logDEBUG) << "Performing gapped I/O statistics";
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SimpleLogger().Write(logDEBUG) << "running gapped I/O statistics";
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//print simple statistics: min, max, median, variance
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std::sort(timing_results_1013.begin(), timing_results_1013.end());
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double primary_min = timing_results_1013.front();
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double primary_max = timing_results_1013.back();
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double primary_med = timing_results_1013[timing_results_1013.size()/2];
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double primary_sum = std::accumulate(
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timing_results_1013.begin(),
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timing_results_1013.end(),
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0.0
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);
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double primary_mean = primary_sum / timing_results_1013.size();
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double primary_sq_sum = std::inner_product(
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timing_results_1013.begin(),
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timing_results_1013.end(),
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timing_results_1013.begin(),
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0.0
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);
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double primary_dev = std::sqrt(
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primary_sq_sum / timing_results_1013.size() -
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(primary_mean * primary_mean)
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);
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Statistics primary_stats;
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RunStatistics(timing_results_gapped, primary_stats);
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SimpleLogger().Write() << "gapped I/O: " <<
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"min: " << primary_min*1000 << "ms, " <<
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"mean: " << primary_mean*1000 << "ms, " <<
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"med: " << primary_med*1000 << "ms, " <<
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"max: " << primary_max*1000 << "ms, " <<
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"dev: " << primary_dev*1000 << "ms";
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"min: " << primary_stats.min*1000 << "ms, " <<
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"mean: " << primary_stats.mean*1000 << "ms, " <<
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"med: " << primary_stats.med*1000 << "ms, " <<
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"max: " << primary_stats.max*1000 << "ms, " <<
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"dev: " << primary_stats.dev*1000 << "ms";
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std::vector<double> timing_results_random;
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volatile unsigned temp_array[1024]; //compilers dont optimize volatiles
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SimpleLogger().Write(logDEBUG) << "performing 1000 random I/Os";
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//make 1000 random access, time each I/O seperately
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SimpleLogger().Write(logDEBUG) << "running 1000 random I/Os of 4KB";
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//make 1000 random access, time each I/O seperately
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for(unsigned i = 0; i < 1000; ++i) {
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unsigned element_to_read = std::rand()%(number_of_elements-1024);
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time1 = get_timestamp();
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@ -177,35 +185,17 @@ int main (int argc, char * argv[]) {
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read_stream.close();
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// Do statistics
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SimpleLogger().Write(logDEBUG) << "Performing random I/O statistics";
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std::sort(timing_results_random.begin(), timing_results_random.end());
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double secondary_min = timing_results_random.front();
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double secondary_max = timing_results_random.back();
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double secondary_med = timing_results_random[timing_results_random.size()/2];
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double secondary_sum = std::accumulate(
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timing_results_random.begin(),
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timing_results_random.end(),
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0.0
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);
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double secondary_mean = secondary_sum / timing_results_random.size();
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SimpleLogger().Write(logDEBUG) << "running random I/O statistics";
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Statistics secondary_stats;
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RunStatistics(timing_results_random, secondary_stats);
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double secondary_sq_sum = std::inner_product(
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timing_results_random.begin(),
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timing_results_random.end(),
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timing_results_random.begin(),
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0.0
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);
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double secondary_stdev = std::sqrt(
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secondary_sq_sum / timing_results_random.size() -
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(secondary_mean * secondary_mean)
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);
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SimpleLogger().Write() << "random I/O: " <<
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"min: " << secondary_stats.min*1000 << "ms, " <<
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"mean: " << secondary_stats.mean*1000 << "ms, " <<
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"med: " << secondary_stats.med*1000 << "ms, " <<
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"max: " << secondary_stats.max*1000 << "ms, " <<
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"dev: " << secondary_stats.dev*1000 << "ms";
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SimpleLogger().Write() << "random I/O: " <<
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"min: " << secondary_min*1000 << "ms, " <<
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"mean: " << secondary_mean*1000 << "ms, " <<
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"med: " << secondary_med*1000 << "ms, " <<
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"max: " << secondary_max*1000 << "ms, " <<
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"dev: " << secondary_stdev*1000 << "ms";
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if( boost::filesystem::exists(test_path) ) {
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boost::filesystem::remove(test_path);
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SimpleLogger().Write(logDEBUG) << "removing temporary files";
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@ -213,8 +203,6 @@ int main (int argc, char * argv[]) {
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} catch ( const std::exception & e ) {
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SimpleLogger().Write(logWARNING) << "caught exception: " << e.what();
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SimpleLogger().Write(logWARNING) << "cleaning up, and exiting";
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boost::filesystem::path test_path = boost::filesystem::path(argv[1]);
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test_path /= "osrm.tst";
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if(boost::filesystem::exists(test_path)) {
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boost::filesystem::remove(test_path);
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SimpleLogger().Write(logWARNING) << "removing temporary files";
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