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c++ Programming Glossary: cpusBenefits of inline functions in C++? http://stackoverflow.com/questions/145838/benefits-of-inline-functions-in-c compiler outputs but with today's optimized compilers fast CPUs huge memory etc. not like in the 1980 where memory was scarce..
Programmatically find the number of cores on a machine http://stackoverflow.com/questions/150355/programmatically-find-the-number-of-cores-on-a-machine 1 HW_AVAILCPU alternatively try HW_NCPU get the number of CPUs from the system sysctl mib 2 numCPU len NULL 0 if numCPU 1 mib..
What is “cache-friendly” code? http://stackoverflow.com/questions/16699247/what-is-cache-friendly-code The problem is memory access. Hardware design efforts in CPUs therefore currently focus heavily on optimizing caches prefetching.. prefetching pipelines and concurrency. For instance modern CPUs spend around 85 of die on caches and up to 99 for storing moving..
What could C/C++ “lose” if they defined a standard ABI? http://stackoverflow.com/questions/2083060/what-could-c-c-lose-if-they-defined-a-standard-abi for the currently common high end general purpose CPUs would require unnatural contortions on some the odder machines..
Microsecond resolution timestamps on Windows http://stackoverflow.com/questions/2414359/microsecond-resolution-timestamps-on-windows may return different results on different CPUs. There are also some processors that adjust their frequency.. some init stuff also I am not sure if it works on multiple CPUs. I also looked at the Wikipedia article Time Stamp Counter which..
Floating point vs integer calculations on modern hardware http://stackoverflow.com/questions/2550281/floating-point-vs-integer-calculations-on-modern-hardware nowadays with exponentially more complex and powerful CPUs it makes no difference in speed if doing floating point or integer..
C++ Timer function to provide time in nano seconds http://stackoverflow.com/questions/275004/c-timer-function-to-provide-time-in-nano-seconds For example in Windows XP all AMD Athlon X2 dual core CPUs return the PC of either of the cores randomly the PC sometimes.. to fix the issue. We haven't noticed any other dual core CPUs having similar issues p4 dual p4 ht core2 dual core2 quad phenom..
What techniques can be used to speed up C++ compilation times? http://stackoverflow.com/questions/373142/what-techniques-can-be-used-to-speed-up-c-compilation-times Many compilers IDEs support using multiple cores CPUs to do compilation simultaneously. In GNU Make usually used with.. Computer More RAM faster hard drives including SSDs more CPUs cores will all make a difference in compilation speed. share..
Performance of built-in types : char vs short vs int vs. float vs. double http://stackoverflow.com/questions/5069489/performance-of-built-in-types-char-vs-short-vs-int-vs-float-vs-double every last cycle or you're writing code for very limited CPUs that have little or no floating point support the performance.. matter to you. Different size integer types Typically CPUs are fastest at operating on integers of their native word size.. are often faster than 8 or 16 bit operations on modern CPUs but this varies quite a bit between architectures. Also remember..
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 safe in an architecture that has more than one of these CPUs sharing memory the lock may only disable interrupts for one..
Why does integer overflow on x86 with GCC cause an infinite loop? http://stackoverflow.com/questions/7682477/why-does-integer-overflow-on-x86-with-gcc-cause-an-infinite-loop around but on occasion weird stuff happens . Yes on x86 CPUs integers usually wrap the way you expect. This is one of those..
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 cache architectures by providing a similar graph for these CPUs. PPS The full code is at http pastebin.com ivzkuTzG . It uses..
Why openmp program only runs in one thread http://stackoverflow.com/questions/10203902/why-openmp-program-only-runs-in-one-thread with g fopenmp . It can correctly print out that I have 4 cpus but all test functions are running at thread 0. I tried to modify..
http://stackoverflow.com/questions/1102692/how-to-do-alpha-blend-fast of processors on Wikipedia but my research shows that AMD cpus from around 4 years ago all support at least SSE2. You should..
http://stackoverflow.com/questions/2901694/programatically-detect-number-of-physical-processors-cores-or-if-hyper-threading unsigned logical regs 1 16 0xff EBX 23 16 cout logical cpus logical endl unsigned cores logical if cpuVendor GenuineIntel.. machines Intel R Core TM 2 Duo CPU T7500 @ 2.20GHz logical cpus 2 cpu cores 2 hyper threads false Intel R Core TM 2 Quad CPU.. false Intel R Core TM 2 Quad CPU Q8400 @ 2.66GHz logical cpus 4 cpu cores 4 hyper threads false Intel R Xeon R CPU E5520 @..
Multithreaded image processing in C++ http://stackoverflow.com/questions/326487/multithreaded-image-processing-in-c optimal number of threads is a function of the number of cpus cores available and the percentage of time each thread spends..
QueryPerformanceCounter Status? http://stackoverflow.com/questions/7287663/queryperformancecounter-status the QPC functionality on the latest Win7 OS and Intel AMD cpus Has there been any improvements Is e.g. Turbo Boost still a..
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