Utilities/test/cputimer_t.cppunit.cpp

0001 /*----------------------------------------------------------------------
0002
0003 Test program for edm::TypeIDBase class.
0004 Changed by Viji on 29-06-2005
0005
0006  ----------------------------------------------------------------------*/
0007
0008 #include <cassert>
0009 #include <iostream>
0010 #include <string>
0011 #include <unistd.h>
0012 #include <sys/resource.h>
0013 #include <cppunit/extensions/HelperMacros.h>
0014 #include "FWCore/Utilities/interface/CPUTimer.h"
0015
0016 class testCPUTimer : public CppUnit::TestFixture {
0017   CPPUNIT_TEST_SUITE(testCPUTimer);
0018
0019   CPPUNIT_TEST(testTiming);
0020
0021   CPPUNIT_TEST_SUITE_END();
0022
0023 public:
0024   void setUp() {}
0025   void tearDown() {}
0026
0027   void testTiming();
0028 };
0029
0030 ///registration of the test so that the runner can find it
0031 CPPUNIT_TEST_SUITE_REGISTRATION(testCPUTimer);
0032
0033 using std::cerr;
0034 using std::endl;
0035
0036 void testCPUTimer::testTiming()
0037
0038 {
0039   edm::CPUTimer timer;
0040   CPPUNIT_ASSERT(timer.realTime() == 0.0);
0041   CPPUNIT_ASSERT(timer.cpuTime() == 0.0);
0042
0043   timer.start();
0044   sleep(2);
0045   timer.stop();
0046   //Consider good enough if times are within 1%. Closer than that causes test failures
0047   if ((timer.realTime() <= 2.0) or (timer.cpuTime() + 2.0 - 0.02 > timer.realTime())) {
0048     std::cerr << "real " << timer.realTime() << " cpu " << timer.cpuTime() << std::endl;
0049   }
0050   CPPUNIT_ASSERT(timer.realTime() > 2.0);
0051   CPPUNIT_ASSERT(timer.cpuTime() + 2.0 - 0.02 <= timer.realTime());
0052
0053   timer.start();
0054   sleep(2);
0055   if (timer.realTime() <= 4.0) {
0056     std::cerr << "real " << timer.realTime() << " cpu " << timer.cpuTime() << std::endl;
0057   }
0058   CPPUNIT_ASSERT(timer.realTime() > 4.0);
0059   //this should do nothing
0060   timer.start();
0061   CPPUNIT_ASSERT(timer.realTime() > 4.0);
0062
0063   sleep(2);
0064
0065   timer.stop();
0066
0067   double real = timer.realTime();
0068   double cpu = timer.cpuTime();
0069
0070   //this should do nothing
0071   timer.stop();
0072   CPPUNIT_ASSERT(timer.realTime() == real);
0073   CPPUNIT_ASSERT(timer.cpuTime() == cpu);
0074
0075   timer.reset();
0076   CPPUNIT_ASSERT(timer.realTime() == 0.0);
0077   CPPUNIT_ASSERT(timer.cpuTime() == 0.0);
0078
0079   rusage theUsage;
0080   getrusage(RUSAGE_SELF, &theUsage);
0081   struct timeval startTime;
0082   startTime.tv_sec = theUsage.ru_utime.tv_sec;
0083   startTime.tv_usec = theUsage.ru_utime.tv_usec;
0084
0085   timer.start();
0086   struct timeval nowTime;
0087   do {
0088     rusage theUsage2;
0089     getrusage(RUSAGE_SELF, &theUsage2);
0090     nowTime.tv_sec = theUsage2.ru_utime.tv_sec;
0091     nowTime.tv_usec = theUsage2.ru_utime.tv_usec;
0092   } while (nowTime.tv_sec - startTime.tv_sec + 1E-6 * (nowTime.tv_usec - startTime.tv_usec) < 1);
0093   timer.stop();
0094
0095   if ((timer.realTime() < 1.0) or (timer.cpuTime() < 1.0)) {
0096     std::cerr << "real " << timer.realTime() << " cpu " << timer.cpuTime() << std::endl;
0097   }
0098   CPPUNIT_ASSERT(timer.realTime() >= 1.0);
0099   CPPUNIT_ASSERT(timer.cpuTime() >= 1.0);
0100 }