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c++ Programming Glossary: measureWhy does the default parameterless constructor go away when you create one with parameters http://stackoverflow.com/questions/11792207/why-does-the-default-parameterless-constructor-go-away-when-you-create-one-with What is the reason for this behavior Is it just a safety measure guess saying If you've created a constructor of your own you..
The C `clock()` function just returns a zero http://stackoverflow.com/questions/2134363/the-c-clock-function-just-returns-a-zero types with no improvement... Is this a good way to measure time with good precision #include time.h #include stdio.h int..
Examples of good gotos in C or C++ http://stackoverflow.com/questions/245742/examples-of-good-gotos-in-c-or-c case for a goto of all the posted answers certainly if you measure it by the contortions a hater has to go through to avoid it...
Linux C++: how to profile time wasted due to cache misses? http://stackoverflow.com/questions/2486840/linux-c-how-to-profile-time-wasted-due-to-cache-misses all functions and screws with caching. Is there a way to measure the time my CPU wastes due to cache misses Thanks c linux caching..
Measuring exception handling overhead in C++ http://stackoverflow.com/questions/43253/measuring-exception-handling-overhead-in-c exception handling overhead in C What is the best way to measure exception handling overhead performance in C Please give standalone..
http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali cl Ox EHsc GL c link ltcg pgi run link ltcg pgo measure ostringstream 61.2 ms 60.5 ms vector char with ordinary iterator..
C++ performance challenge: integer to std::string conversion http://stackoverflow.com/questions/4351371/c-performance-challenge-integer-to-stdstring-conversion doesn't http ideone.com T5Wim I'll post my performance measurements as an answer shortly. Rules for algorithms Provide code.. let's use MB s throughput as our standard unit of measure . I believe that the code for my algorithm I know the sprintf..
http://stackoverflow.com/questions/4707012/c-memcpy-vs-stdcopy SHA 2 versions 224 256 384 512 and I loop 300 times. I measure times using Boost.timer. That 300 loop counter is enough to..
pimpl: shared_ptr or unique_ptr http://stackoverflow.com/questions/5576922/pimpl-shared-ptr-or-unique-ptr bare pointers and references. shared_ptr offer an extra measure of safety to avoid dead references at the cost of extra complexity..
Quick and dirty way to profile your code http://stackoverflow.com/questions/61278/quick-and-dirty-way-to-profile-your-code have a measurable effect on the outcome so that scopes you measure will take longer than those you don't. I use this class when..
What's the best way to do fixed-point math? [closed] http://stackoverflow.com/questions/79677/whats-the-best-way-to-do-fixed-point-math of its performance as compared to using plain integers measure it. It will save you from many a trouble by moving the complexity..
Efficiently convert between Hex, Binary, and Decimal in C/C++ http://stackoverflow.com/questions/819487/efficiently-convert-between-hex-binary-and-decimal-in-c-c domains it is possible to beat the library functions. So measure first and if the performance of these conversion is really an.. may require multiple indirections for shared libraries so measure these things carefully to make sure you are not decreasing performance... have evidence that they are a problem. If you do optimize measure your new implementation to make sure it is faster and make sure..
Finding out the CPU clock frequency (per core, per processor) http://stackoverflow.com/questions/8351944/finding-out-the-cpu-clock-frequency-per-core-per-processor such as SpeedStep and Turbo Boost. All known methods to measure frequency require an accurate measurement of time. However a.. All known methods to measure frequency require an accurate measurement of time. However a determined cheater can tamper with all.. Boost multiplier at 46x . Now suppose you find a way to measure the true frequency or you're happy enough with rdtsc . To get..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle to peak performance for the little c example above. I measured between 1.85 2.01 flops cycle have used clock in Windows which.. I've done this exact task before. But it was mainly to measure power consumption and CPU temperatures. The following code which.. normalization step. However since I wrote the benchmark to measure power consumption and temperature I had to make sure the flops..
Fast intersection of sets: C++ vs C# http://stackoverflow.com/questions/1060648/fast-intersection-of-sets-c-vs-c-sharp to do those things they should not be benchmarked here. Measure one thing at a time to reduce uncertainty. If you want your..
What is the Fastest Method for High Performance Sequential File I/O in C++? http://stackoverflow.com/questions/1201261/what-is-the-fastest-method-for-high-performance-sequential-file-i-o-in-c the fastest possible sequential file I O in C Rule 0 Measure. Use all available profiling tools and get to know them. It's..
Profiling the C++ compilation process http://stackoverflow.com/questions/13559818/profiling-the-c-compilation-process just like the normal binary target depends on .o files. Measure how long it takes to build this target add a 'PHONY target that.. that depends on all the .o files but doesn't link them. Measure how long it takes to build this target from clean measure how..
When is overloading pass by reference (l-value and r-value) preferred to pass-by-value? http://stackoverflow.com/questions/18303287/when-is-overloading-pass-by-reference-l-value-and-r-value-preferred-to-pass-by
Boost::multi_array performance question http://stackoverflow.com/questions/446866/boostmulti-array-performance-question native array double nativeMatrix new double X_SIZE Y_SIZE Measure boost startTime GetTickCount for int i 0 i ITERATIONS i .. Elapsed time 6.3f seconds n endTime startTime 1000.0 Measure native startTime GetTickCount for int i 0 i ITERATIONS i..
Measuring NUMA (Non-Uniform Memory Access). No observable asymmetry. Why? http://stackoverflow.com/questions/7259363/measuring-numa-non-uniform-memory-access-no-observable-asymmetry-why x 50 times and read and write each byte in the array. Measure the elapsed time to do the 50 iterations. Then on each of the..
http://stackoverflow.com/questions/7743771/function-hooking-in-c function body. Wrap the function body in a try catch body. Measure duration of a function etc... I have seen different implementations..
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