148 lines
4.4 KiB
C++
148 lines
4.4 KiB
C++
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "ns3/core-module.h"
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#include <chrono>
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#include <cstdio>
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#include <cstdlib>
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#include <fstream>
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#include <iostream>
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using namespace ns3;
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/**
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* \ingroup system-tests-perf
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*
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* Check the performance of writing to file.
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*
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* \param file The file to write to.
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* \param n The number of writes to perform.
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* \param buffer The buffer to write.
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* \param size The buffer size.
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*/
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void
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PerfFile(FILE* file, uint32_t n, const char* buffer, uint32_t size)
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{
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for (uint32_t i = 0; i < n; ++i)
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{
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if (std::fwrite(buffer, 1, size, file) != size)
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{
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NS_ABORT_MSG("PerfFile(): fwrite error");
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}
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}
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}
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/**
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* \ingroup system-tests-perf
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*
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* Check the performance of writing to an output stream.
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*
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* \param stream The output stream to write to.
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* \param n The number of writes to perform.
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* \param buffer The buffer to write.
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* \param size The buffer size.
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*/
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void
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PerfStream(std::ostream& stream, uint32_t n, const char* buffer, uint32_t size)
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{
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for (uint32_t i = 0; i < n; ++i)
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{
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stream.write(buffer, size);
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}
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}
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int
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main(int argc, char* argv[])
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{
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uint32_t n = 100000;
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uint32_t iter = 50;
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bool doStream = false;
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bool binmode = true;
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CommandLine cmd(__FILE__);
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cmd.AddValue("n", "How many times to write (defaults to 100000", n);
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cmd.AddValue("iter", "How many times to run the test looking for a min (defaults to 50)", iter);
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cmd.AddValue("doStream", "Run the C++ I/O benchmark otherwise the C I/O ", doStream);
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cmd.AddValue("binmode",
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"Select binary mode for the C++ I/O benchmark (defaults to true)",
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binmode);
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cmd.Parse(argc, argv);
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auto minResultNs =
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std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::nanoseconds::max());
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char buffer[1024];
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if (doStream)
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{
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//
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// This will probably run on a machine doing other things. Run it some
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// relatively large number of times and try to find a minimum, which
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// will hopefully represent a time when it runs free of interference.
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//
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for (uint32_t i = 0; i < iter; ++i)
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{
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std::ofstream stream;
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if (binmode)
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{
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stream.open("streamtest", std::ios_base::binary | std::ios_base::out);
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}
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else
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{
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stream.open("streamtest", std::ios_base::out);
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}
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auto start = std::chrono::steady_clock::now();
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PerfStream(stream, n, buffer, 1024);
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auto end = std::chrono::steady_clock::now();
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auto resultNs = std::chrono::duration_cast<std::chrono::nanoseconds>(end - start);
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resultNs = std::min(resultNs, minResultNs);
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stream.close();
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std::cout << ".";
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std::cout.flush();
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}
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std::cout << std::endl;
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}
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else
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{
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//
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// This will probably run on a machine doing other things. Run it some
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// relatively large number of times and try to find a minimum, which
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// will hopefully represent a time when it runs free of interference.
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//
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for (uint32_t i = 0; i < iter; ++i)
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{
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FILE* file = fopen("filetest", "w");
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auto start = std::chrono::steady_clock::now();
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PerfFile(file, n, buffer, 1024);
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auto end = std::chrono::steady_clock::now();
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auto resultNs = std::chrono::duration_cast<std::chrono::nanoseconds>(end - start);
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resultNs = std::min(resultNs, minResultNs);
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fclose(file);
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file = nullptr;
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std::cout << ".";
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std::cout.flush();
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}
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std::cout << std::endl;
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}
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std::cout << argv[0] << ": " << minResultNs.count() << "ns" << std::endl;
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return 0;
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}
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