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c++ Programming Glossary: allocationsHow to debug heap corruption errors? http://stackoverflow.com/questions/1010106/how-to-debug-heap-corruption-errors and the occasional wild pointer alloc fill fill new allocations with a magic non 0 value Visual C will already do this for you..
Any reason to overload global new and delete? http://stackoverflow.com/questions/1152511/any-reason-to-overload-global-new-and-delete operators where I work for many reasons pooling all small allocations decreases overhead decreases fragmentation can increase performance.. increase performance for small alloc heavy apps framing allocations with a known lifetime ignore all the frees until the very end.. underruns and the occasional wild pointer redirecting allocations to account for NUMA special memory areas or even to keep separate..
http://stackoverflow.com/questions/1350819/c-free-store-vs-heap Free Store vs Heap Dynamic allocations with new delete are said to take place on the free store while..
C++ Vector of Pointers to Objects http://stackoverflow.com/questions/1361139/c-vector-of-pointers-to-objects shown above but because shared_ptr has to internally make allocations it's generally more efficient and technically more exception..
When and why will an OS initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete? http://stackoverflow.com/questions/370195/when-and-why-will-an-os-initialise-memory-to-0xcd-0xdd-etc-on-malloc-free-new 0xED or Aligned Fence 'No man's land' for aligned allocations. Using a 0xBD different value here than 0xFD allows the runtime..
http://stackoverflow.com/questions/3770457/what-is-memory-fragmentation with memory fragmentation Also I've heard using dynamic allocations a lot can increase memory fragmentation. Is this true In the.. expanse of free memory Now allocate some of it 5 allocations aaaabbccccccddeeee Now free the first four allocations.. aaaabbccccccddeeee Now free the first four allocations but not the fifth eeee Now try to allocate 16 bytes. Oops..
http://stackoverflow.com/questions/408670/stack-static-and-heap-in-c process by using buffers of preset sizes for all allocations. Stack variables are useful for when you know that as long as.. to automatically go away when you leave that code. Heap allocations dynamically allocated memory is useful when you want to be more.. pointers and how to correctly handle their dynamic memory allocations. Some other languages like Python would be horrible without..
How to reuse an ostringstream? http://stackoverflow.com/questions/624260/how-to-reuse-an-ostringstream buffer so that my app doesn't have to do as many allocations. How do I reset the object to its initial state c stl reset.. for inputs seek get ptr to start That will prevent some reallocations done by str by overwriting whatever is in the output buffer..
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 lived of the short lived variables strictly overlaps the allocations of shorter lived variables that come after it. Local variables..
Why would one replace default new and delete operators? http://stackoverflow.com/questions/7149461/why-would-one-replace-default-new-and-delete-operators of allocation blocks Distribution of lifetimes Order of allocations FIFO or LIFO or random Understanding usage patterns changes.. compilers don't guarantee eight byte alignment for dynamic allocations of doubles. In such cases replacing the default operator new..
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 all the arrays separately. Usually when such large allocations are requested the allocator will request fresh pages from the.. from the OS. Therefore there is a high chance that large allocations will appear at the same offset from a page boundary. Here's..
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