wipcancel

1 files changed, 127 insertions, 0 deletions

diff --git a/benchmark/cancel.cc b/benchmark/cancel.cc
new file mode 100644
index 00000000..af475318
--- /dev/null
+++ b/benchmark/cancel.cc
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+/*
+    Copyright (C) 2015-2019 Carl Hetherington <cth@carlh.net>
+
+    This file is part of libdcp.
+
+    libdcp is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    libdcp is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with libdcp.  If not, see <http://www.gnu.org/licenses/>.
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of portions of this program with the
+    OpenSSL library under certain conditions as described in each
+    individual source file, and distribute linked combinations
+    including the two.
+
+    You must obey the GNU General Public License in all respects
+    for all of the code used other than OpenSSL.  If you modify
+    file(s) with this exception, you may extend this exception to your
+    version of the file(s), but you are not obligated to do so.  If you
+    do not wish to do so, delete this exception statement from your
+    version.  If you delete this exception statement from all source
+    files in the program, then also delete it here.
+*/
+
+
+#include "j2k_transcode.h"
+#include <boost/thread.hpp>
+#include <sys/time.h>
+#include <cfloat>
+#include <iomanip>
+#include <iostream>
+
+
+using std::cout;
+using std::cerr;
+using std::fixed;
+using std::make_shared;
+using std::setprecision;
+using std::vector;
+
+
+class Timer
+{
+public:
+	Timer()
+	{
+		gettimeofday(&_start, 0);
+	}
+
+	float get()
+	{
+		struct timeval now;
+		gettimeofday(&now, 0);
+		return (now.tv_sec + now.tv_usec / 1e6) - (_start.tv_sec + _start.tv_usec / 1e6);
+	}
+
+private:
+	struct timeval _start;
+};
+
+
+/** Test how fast J2K decodes can be cancelled */
+int
+main(int argc, char* argv[])
+{
+	if (argc < 2) {
+		cerr << "Syntax: " << argv[0] << " private-test-path\n";
+		exit(EXIT_FAILURE);
+	}
+
+	int const trials = 512;
+	int const max_sleep_ms = 200;
+
+	dcp::ArrayData j2k(boost::filesystem::path(argv[1]) / "thx.j2c");
+
+	float minimum = FLT_MAX;
+	float maximum = 0;
+	float total = 0;
+
+	vector<int> histo(25);
+
+	for (int i = 0; i < trials; ++i) {
+		auto cancel = make_shared<dcp::OpenJPEGCancel>();
+		boost::thread thread([&]() {
+			try {
+				dcp::decompress_j2k(j2k, 0, cancel);
+			} catch (...) {}
+		});
+
+		usleep((rand() % max_sleep_ms) * 1000);
+		Timer timer;
+		cancel->cancel();
+		thread.join();
+		auto time = timer.get();
+		minimum = std::min(minimum, time);
+		maximum = std::max(maximum, time);
+		total += time;
+
+		int const ms = time * 1000;
+		if (ms < static_cast<int>(histo.size())) {
+			histo[ms]++;
+		}
+	}
+
+	cout << fixed << setprecision(3) << "min: " << minimum << "\n";
+	cout << fixed << setprecision(3) << "max: " << maximum << "\n";
+	cout << fixed << setprecision(3) << "ave: " << (total / trials) << "\n";
+
+	for (auto i = 0U; i < histo.size(); ++i) {
+		std::cout << i << ": " << histo[i] << "\n";
+	}
+
+	return 0;
+}
+
+
+
+