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c++ Programming Glossary: slowerCopy a file in an sane, safe and efficient way http://stackoverflow.com/questions/10195343/copy-a-file-in-an-sane-safe-and-efficient-way is faster with POSIX and SENDFILE all other programs are slower. Maybe the options truncate or create have a impact on this.. und 0.30 seconds buffered. So cp is a little bit slower than the POSIX sample. Looks fine for me. Maybe I add also samples..
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 unsorted data. In the C case the hack is actually a tad slower than with the branch when the data is sorted. A general rule..
std::vector is so much slower than plain arrays? http://stackoverflow.com/questions/3664272/stdvector-is-so-much-slower-than-plain-arrays vector is so much slower than plain arrays I've always thought it's the general wisdom.. thing completed in 26.591 seconds That's about 3 4 times slower Doesn't really justify for the vector may be slower for a few.. times slower Doesn't really justify for the vector may be slower for a few nanosecs comments. And the code I used #include cstdlib..
http://stackoverflow.com/questions/5854581/polymorphism-in-c .size but presumably suffers in some way e.g. using the slower strlen or not printing as useful a message in the log . The..
Can a local variable's memory be accessed outside its scope? http://stackoverflow.com/questions/6441218/can-a-local-variables-memory-be-accessed-outside-its-scope the heap. It doesn't because that would make the program slower. An implementation of C is not required to leave the garbage..
Why should `new` be used as little as possible? http://stackoverflow.com/questions/6500313/why-should-new-be-used-as-little-as-possible mode. Bookkeeping is more complex and allocation is slower. Because there is no implicit release point you must release.. to use dynamic allocation Even if using the heap is slower and potentially leads to memory leaks or memory fragmentation..
Is #pragma once a safe include guard? http://stackoverflow.com/questions/787533/is-pragma-once-a-safe-include-guard
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 is one loop so much slower than two loops Suppose a1 b1 c1 and d1 point to heap memory.. isn't completely uniform. Accessing 4 ways is still slower than say 2 ways. EDIT It does in fact look like you are allocating.. are faster. Furthermore the second double loop is now the slower one as you would normally expect. As @Stephen Cannon points..
Why does changing 0.1f to 0 slow down performance by 10x? http://stackoverflow.com/questions/9314534/why-does-changing-0-1f-to-0-slow-down-performance-by-10x floating point can be tens to hundreds of times slower than on normalized floating point. This is because many processors.. _MM_FLUSH_ZERO_ON Then the version with 0 is no longer 10x slower and actually becomes faster. This requires that the code be..
Why is reading lines from stdin much slower in C++ than Python? http://stackoverflow.com/questions/9371238/why-is-reading-lines-from-stdin-much-slower-in-c-than-python is reading lines from stdin much slower in C than Python I wanted to compare reading lines of string.. and was shocked to see my C code run an order of magnitude slower than the equivalent Python code. Since my C is rusty and I'm.. of this version is quite fast though still a bit slower than the raw c wc utility of course usr bin time cat temp_big_file..
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