¡@
c++ Programming Glossary: processorWhy 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 backing up and restarting. Consider an if statement At the processor level it is a branch instruction You are a processor and you.. the processor level it is a branch instruction You are a processor and you see a branch. You have no idea which way it will go... complete. Then you continue down the correct path. Modern processors are complicated and have long pipelines. So they take forever..
Why isn't sizeof for a struct equal to the sum of sizeof of each member? http://stackoverflow.com/questions/119123/why-isnt-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member members are optimally aligned for better performance. Many processors perform best when fundamental data types are stored at byte.. sizes. Here's an example using typical settings for an x86 processor struct X short s 2 bytes 2 padding bytes int i 4 bytes char..
http://stackoverflow.com/questions/1553382/is-delete-equal-to-delete on the number or neutrinos that passed through the processor on the last sunny afternoon. Or it might not. All that and an..
What is “cache-friendly” code? http://stackoverflow.com/questions/16699247/what-is-cache-friendly-code . This will only get worse over time. The increase in processor frequency is currently no longer relevant to increase performance... A common problem in modern architectures with multiprocessor caches is called false sharing . This occurs when each individual.. is called false sharing . This occurs when each individual processor is attempting to use data in another memory region and attempts..
Does the size of an int depend on the compiler and/or processor? http://stackoverflow.com/questions/2331751/does-the-size-of-an-int-depend-on-the-compiler-and-or-processor the size of an int depend on the compiler and or processor this was an interview question would the size of an integer.. would the size of an integer depend upon the compiler or processor c c types share improve this question The answer to this..
Floating point vs integer calculations on modern hardware http://stackoverflow.com/questions/2550281/floating-point-vs-integer-calculations-on-modern-hardware integer floating point math. It varies strongly from processor to processor even within the same family such as x86 because.. floating point math. It varies strongly from processor to processor even within the same family such as x86 because different processors.. even within the same family such as x86 because different processors have different pipeline lengths. Also some operations are generally..
C++ Timer function to provide time in nano seconds http://stackoverflow.com/questions/275004/c-timer-function-to-provide-time-in-nano-seconds QueryPerformanceFrequency typically adjust for multiple processors bugs in the BIOS or drivers may result in these routines returning.. returning different values as the thread moves from one processor to another... However this StackOverflow answer http stackoverflow.com.. 2. This article shows that Windows 7 can determine if the processor s have an invariant TSC and falls back to an external timer..
Operator Precedence vs Order of Evaluation http://stackoverflow.com/questions/5473107/operator-precedence-vs-order-of-evaluation For a couple of examples the Intel Itanium and VLIW processors such as some DSPs allow a compiler to designate a number of.. a 64 bit virtual machine but the real hardware is an 8 bit processor. When you increment a 64 bit variable it executes a sequence..
How does the compilation, linking process work? http://stackoverflow.com/questions/6264249/how-does-the-compilation-linking-process-work of a C program involves several steps Preprocessing the preprocessor takes a C source code file and deals with the #include s #define.. file and deals with the #include s #define s and other preprocessor directives. The output of this step is a pure C file without.. The output of this step is a pure C file without pre processor directives Compilation the compiler takes the pre processor's..
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 0 while fgets line 128 file NULL if strncmp line processor 9 0 numProcessors fclose file double getCurrentValue struct..
I've heard i++ isn't thread safe, is ++i thread-safe? http://stackoverflow.com/questions/680097/ive-heard-i-isnt-thread-safe-is-i-thread-safe that i is thread safe for a specific compiler and specific processor architecture but it's not mandated in the standards at all...
Have you used any of the C++ interpreters (not compilers)? http://stackoverflow.com/questions/69539/have-you-used-any-of-the-c-interpreters-not-compilers loop share improve this question cint is the command processor for the particle physics analysis package ROOT . I use it regularly..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle has trouble compiling it well. These are for pre FMA processors. In order to achieve peak FLOPS on Intel Haswell and AMD Bulldozer.. to achieve peak FLOPS on Intel Haswell and AMD Bulldozer processors and later FMA Fused Multiply Add instructions will be needed... 4 cores 3.5 GHz 56.0 GFlops . Actual is 51.3 GFlops . My processor temps hit 76C on the multi threaded run If you runs these be..
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 each loop will fall on the same cache way. However Intel processors have had 8 way L1 cache associativity for a while. But in reality.. which most likely causes false aliasing stalls in the processor load store units. However in order for false aliasing to occur..
Test Automation with Embedded Hardware http://stackoverflow.com/questions/115115/test-automation-with-embedded-hardware etc.. Is this even worth the effort We typically target Processor 8 or 16 bit microcontrollers some DSP stuff Language C sometimes..
Is Updating double operation atomic http://stackoverflow.com/questions/1292786/is-updating-double-operation-atomic html memory.doc.html#28733 In C if I am using 32 bit Intel Processor Microsoft Visual C compiler is updating double 8 byte operation..
http://stackoverflow.com/questions/1932222/c-vector-vs-array-time Platform Visual Studio 2008 OS Windows Vista 32 bit SP 1 Processor Intel R Pentium R Dual CPU T2370 @ 1.73GHz Memory RAM 1.00 GB..
Why does gcc generate 15-20% faster code if I optimize for SIZE instead of speed? http://stackoverflow.com/questions/19470873/why-does-gcc-generate-15-20-faster-code-if-i-optimize-for-size-instead-of-speed time . test 0 0 on several processors user time reported Processor System on Chip Compiler Time O2 Time Os Fastest AMD Opteron.. processor using options mtune native or march native Processor Compiler Time O2 mtune native Time Os mtune native AMD FX 6300..
Monitoring CPU and disk utilization of a single program http://stackoverflow.com/questions/2475341/monitoring-cpu-and-disk-utilization-of-a-single-program counter L Process program_you_are_interested_in_name Processor Time for CPU Utilization and possibly L Process program_you_are_interested_in_name.. twice the performance counter L Process a_program_name Processor Time . In the example it is done in a loop. By the way measuring.. here CONST PWSTR COUNTER_PATH L Process a_program_name Processor Time void main int argc char argv PDH_HQUERY hquery PDH_HCOUNTER..
Double dispatch/multimethods in C++ http://stackoverflow.com/questions/429849/double-dispatch-multimethods-in-c I have with the Shape examples is that in my application Processor and BaseClass are entirely independent and don't have a common.. they can call in each other. Secondly there is only one Processor i.e. nothing inherits from it . Thanks for any help. #include.. void myFunction cout Derived3 myFunction called endl class Processor public Processor virtual void processObj BaseClass bc cout got..
http://stackoverflow.com/questions/4562249/size-of-primitive-data-types size of a primitive data type like int depend on Compiler Processor Development Environment Or is it a combination of these or other..
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 PdhOpenQuery NULL NULL &cpuQuery PdhAddCounter cpuQuery L Processor _Total Processor Time NULL &cpuTotal PdhCollectQueryData cpuQuery.. NULL &cpuQuery PdhAddCounter cpuQuery L Processor _Total Processor Time NULL &cpuTotal PdhCollectQueryData cpuQuery double getCurrentValue.. lastCPU lastSysCPU lastUserCPU static int numProcessors static HANDLE self void init SYSTEM_INFO sysInfo FILETIME ftime..
|