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c++ Programming Glossary: clock_tCopy a file in an sane, safe and efficient way http://stackoverflow.com/questions/10195343/copy-a-file-in-an-sane-safe-and-efficient-way fwrite BUFSIZ #include ctime using namespace std int main clock_t start end start clock BUFSIZE default is 8192 bytes BUFSIZE.. cstdio BUFSIZ #include ctime using namespace std int main clock_t start end start clock BUFSIZE defaults to 8192 BUFSIZE of 1.. fstream #include ctime using namespace std int main clock_t start end start clock ifstream source from.ogv ios binary ofstream..
Why is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array next loop runs faster std sort data data arraySize Test clock_t start clock long long sum 0 for unsigned i 0 i 100000 i Primary..
How to Calculate Execution Time of a Code Snippet in C++ http://stackoverflow.com/questions/1861294/how-to-calculate-execution-time-of-a-code-snippet-in-c I use code the following code to do this. import before clock_t startTime clock some code here to compute its execution duration..
mixing cout and printf for faster output http://stackoverflow.com/questions/1924530/mixing-cout-and-printf-for-faster-output This is a string. void show_time void f char const caption clock_t start clock f clock_t ticks clock start std cerr std setw 30.. show_time void f char const caption clock_t start clock f clock_t ticks clock start std cerr std setw 30 caption double ticks..
The C `clock()` function just returns a zero http://stackoverflow.com/questions/2134363/the-c-clock-function-just-returns-a-zero good precision #include time.h #include stdio.h int main clock_t start end double cpu_time_used char s 32 start clock printf..
how to sum a large number of float number? http://stackoverflow.com/questions/2148149/how-to-sum-a-large-number-of-float-number be 1e 008 int main size_t N 100000000 cout n is N endl clock_t start clock task_scheduler_init init vector float myvec vector.. mysum mysum parallelSum pvec cout the p sum is mysum endl clock_t finish clock cout Time Used finish start CLOCKS_PER_SEC endl..
C++ Timer function to provide time in nano seconds http://stackoverflow.com/questions/275004/c-timer-function-to-provide-time-in-nano-seconds cstdio using namespace std int main int argc char argv clock_t start double diff start clock diff std clock start double CLOCKS_PER_SEC..
How to determine CPU and memory consumption from inside a process? http://stackoverflow.com/questions/63166/how-to-determine-cpu-and-memory-consumption-from-inside-a-process string.h #include sys times.h #include sys vtimes.h static clock_t lastCPU lastSysCPU lastUserCPU static int numProcessors void.. fclose file double getCurrentValue struct tms timeSample clock_t now double percent now times &timeSample if now lastCPU timeSample.tms_stime..
Fast multiplication/division by 2 for floats and doubles (C/C++) http://stackoverflow.com/questions/7720668/fast-multiplication-division-by-2-for-floats-and-doubles-c-c code double ds 0x1000 for int i 0 i 0x1000 i ds i 1.2 clock_t t clock for int j 0 j 1000000 j for int i 0 i 0x1000 i #if DOUBLE_SHIFT.. ds i 1 4 #else unsigned int ds i 1 4 20 #endif clock_t e clock printf g n float e t CLOCKS_PER_SEC In the DOUBLE_SHIFT..
Why is one loop so much slower than two loops? http://stackoverflow.com/questions/8547778/why-is-one-loop-so-much-slower-than-two-loops cout a1 endl cout b1 endl cout c1 endl cout d1 endl clock_t start clock int c 0 while c 10000 #if ONE_LOOP for int j 0 j.. j 0 j n j a1 j b1 j for int j 0 j n j c1 j d1 j #endif clock_t end clock cout seconds double end start CLOCKS_PER_SEC endl..
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