Add a --mibibytes flag to output bandwidth and array sizes in base 2
This sets MiB = 2^20, GiB = 2^30 rather than the default of MB = 10^6 and GB = 10^9.
This commit is contained in:
Tom Deakin
parent
db2a4c40d8
commit
5a1396671e
102
main.cpp
102
main.cpp
@ -46,6 +46,7 @@ unsigned int deviceIndex = 0;
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bool use_float = false;
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bool triad_only = false;
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bool output_as_csv = false;
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bool mibibytes = false;
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std::string csv_separator = ",";
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template <typename T>
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@ -105,11 +106,24 @@ void run()
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std::cout << "Precision: double" << std::endl;
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std::cout << std::setprecision(1) << std::fixed
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<< "Array size: " << ARRAY_SIZE*sizeof(T)*1.0E-6 << " MB"
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<< " (=" << ARRAY_SIZE*sizeof(T)*1.0E-9 << " GB)" << std::endl;
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std::cout << "Total size: " << 3.0*ARRAY_SIZE*sizeof(T)*1.0E-6 << " MB"
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<< " (=" << 3.0*ARRAY_SIZE*sizeof(T)*1.0E-9 << " GB)" << std::endl;
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if (mibibytes)
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{
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// MiB = 2^20
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std::cout << std::setprecision(1) << std::fixed
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<< "Array size: " << ARRAY_SIZE*sizeof(T)*pow(2.0, -20.0) << " MiB"
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<< " (=" << ARRAY_SIZE*sizeof(T)*pow(2.0, -30.0) << " GiB)" << std::endl;
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std::cout << "Total size: " << 3.0*ARRAY_SIZE*sizeof(T)*pow(2.0, -20.0) << " MiB"
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<< " (=" << 3.0*ARRAY_SIZE*sizeof(T)*pow(2.0, -30.0) << " GiB)" << std::endl;
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}
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else
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{
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// MB = 10^6
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std::cout << std::setprecision(1) << std::fixed
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<< "Array size: " << ARRAY_SIZE*sizeof(T)*1.0E-6 << " MB"
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<< " (=" << ARRAY_SIZE*sizeof(T)*1.0E-9 << " GB)" << std::endl;
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std::cout << "Total size: " << 3.0*ARRAY_SIZE*sizeof(T)*1.0E-6 << " MB"
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<< " (=" << 3.0*ARRAY_SIZE*sizeof(T)*1.0E-9 << " GB)" << std::endl;
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}
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std::cout.precision(ss);
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}
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@ -210,23 +224,35 @@ void run()
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check_solution<T>(num_times, a, b, c, sum);
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// Display timing results
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std::string units;
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if (output_as_csv)
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{
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if (mibibytes)
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units = "max_mibytes_per_sec";
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else
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units = "max_mbytes_per_sec";
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std::cout
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<< "function" << csv_separator
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<< "num_times" << csv_separator
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<< "n_elements" << csv_separator
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<< "sizeof" << csv_separator
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<< "max_mbytes_per_sec" << csv_separator
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<< units << csv_separator
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<< "min_runtime" << csv_separator
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<< "max_runtime" << csv_separator
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<< "avg_runtime" << std::endl;
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}
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else
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{
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if (mibibytes)
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units = "MiBytes/sec";
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else
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units = "MBytes/sec";
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std::cout
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<< std::left << std::setw(12) << "Function"
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<< std::left << std::setw(12) << "MBytes/sec"
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<< std::left << std::setw(12) << units
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<< std::left << std::setw(12) << "Min (sec)"
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<< std::left << std::setw(12) << "Max"
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<< std::left << std::setw(12) << "Average"
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@ -260,8 +286,18 @@ void run()
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<< labels[i] << csv_separator
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<< num_times << csv_separator
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<< ARRAY_SIZE << csv_separator
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<< sizeof(T) << csv_separator
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<< 1.0E-6 * sizes[i] / (*minmax.first) << csv_separator
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<< sizeof(T) << csv_separator;
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if (mibibytes)
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{
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std::cout
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<< pow(2.0, -20.0) * sizes[i] / (*minmax.first) << csv_separator;
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}
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else
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{
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std::cout
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<< 1.0E-6 * sizes[i] / (*minmax.first) << csv_separator;
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}
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std::cout
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<< *minmax.first << csv_separator
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<< *minmax.second << csv_separator
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<< average
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@ -298,11 +334,22 @@ void run_triad()
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std::cout << "Precision: double" << std::endl;
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std::streamsize ss = std::cout.precision();
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std::cout << std::setprecision(1) << std::fixed
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<< "Array size: " << ARRAY_SIZE*sizeof(T)*1.0E-3 << " KB"
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<< " (=" << ARRAY_SIZE*sizeof(T)*1.0E-6 << " MB)" << std::endl;
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std::cout << "Total size: " << 3.0*ARRAY_SIZE*sizeof(T)*1.0E-3 << " KB"
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<< " (=" << 3.0*ARRAY_SIZE*sizeof(T)*1.0E-6 << " MB)" << std::endl;
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if (mibibytes)
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{
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std::cout << std::setprecision(1) << std::fixed
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<< "Array size: " << ARRAY_SIZE*sizeof(T)*pow(2.0, -10.0) << " KiB"
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<< " (=" << ARRAY_SIZE*sizeof(T)*pow(2.0, -20.0) << " MiB)" << std::endl;
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std::cout << "Total size: " << 3.0*ARRAY_SIZE*sizeof(T)*pow(2.0, -10.0) << " KiB"
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<< " (=" << 3.0*ARRAY_SIZE*sizeof(T)*pow(2.0, -20.0) << " MiB)" << std::endl;
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}
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else
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{
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std::cout << std::setprecision(1) << std::fixed
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<< "Array size: " << ARRAY_SIZE*sizeof(T)*1.0E-3 << " KB"
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<< " (=" << ARRAY_SIZE*sizeof(T)*1.0E-6 << " MB)" << std::endl;
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std::cout << "Total size: " << 3.0*ARRAY_SIZE*sizeof(T)*1.0E-3 << " KB"
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<< " (=" << 3.0*ARRAY_SIZE*sizeof(T)*1.0E-6 << " MB)" << std::endl;
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}
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std::cout.precision(ss);
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}
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@ -369,15 +416,26 @@ void run_triad()
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// Display timing results
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double total_bytes = 3 * sizeof(T) * ARRAY_SIZE * num_times;
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double bandwidth = 1.0E-9 * (total_bytes / runtime);
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double bandwidth;
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std::string units;
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if (mibibytes)
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bandwidth = pow(2.0, -30.0) * (total_bytes / runtime);
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else
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bandwidth = 1.0E-9 * (total_bytes / runtime);
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if (output_as_csv)
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{
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if (mibibytes)
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units = "gibytes_per_sec";
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else
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units = "gbytes_per_sec";
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std::cout
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<< "function" << csv_separator
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<< "num_times" << csv_separator
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<< "n_elements" << csv_separator
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<< "sizeof" << csv_separator
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<< "gbytes_per_sec" << csv_separator
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<< units << csv_separator
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<< "runtime"
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<< std::endl;
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std::cout
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@ -391,12 +449,17 @@ void run_triad()
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}
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else
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{
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if (mibibytes)
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units = "GiB/s";
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else
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units = "GB/s";
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std::cout
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<< "--------------------------------"
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<< std::endl << std::fixed
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<< "Runtime (seconds): " << std::left << std::setprecision(5)
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<< runtime << std::endl
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<< "Bandwidth (GB/s): " << std::left << std::setprecision(3)
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<< "Bandwidth (" << units << "): " << std::left << std::setprecision(3)
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<< bandwidth << std::endl;
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}
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@ -521,6 +584,10 @@ void parseArguments(int argc, char *argv[])
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{
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output_as_csv = true;
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}
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else if (!std::string("--mibibytes").compare(argv[i]))
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{
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mibibytes = true;
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}
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else if (!std::string("--help").compare(argv[i]) ||
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!std::string("-h").compare(argv[i]))
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{
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@ -535,6 +602,7 @@ void parseArguments(int argc, char *argv[])
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std::cout << " --float Use floats (rather than doubles)" << std::endl;
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std::cout << " --triad-only Only run triad" << std::endl;
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std::cout << " --csv Output as csv table" << std::endl;
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std::cout << " --mibibytes Use MiB=2^20 for bandwidth calculation (default MB=10^6)" << std::endl;
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std::cout << std::endl;
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exit(EXIT_SUCCESS);
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}
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