Different ways to deallocate an array – c++

new type requires deletenew type[size] requires delete []Using one instead of the other is wrong. Btw you should not use such raw pointers like this unless you have a very good reason. Use std::vector or std::array instead. And 2D MxN arrays should generally be linearised into 1D M*N arrays, also using these containers.

calculate the effective access time

This is a paragraph from Operating System Concepts, 9th edition by Silberschatz et al: The percentage of times that the page number of interest is found in the TLB is called the hit ratio. An 80-percent hit ratio, for example, means that we find the desired page number in the TLB 80 percent of the … Read more

Releasing memory in Python

Memory allocated on the heap can be subject to high-water marks. This is complicated by Python’s internal optimizations for allocating small objects (PyObject_Malloc) in 4 KiB pools, classed for allocation sizes at multiples of 8 bytes — up to 256 bytes (512 bytes in 3.3). The pools themselves are in 256 KiB arenas, so if … Read more

Dynamic vs static array in c

There are several flavors of arrays, depending on how and where they are declared. Fixed-length Arrays Fixed-length arrays must have their size determined at compile time. You cannot change the size of a fixed-length array after it has been defined. Fixed-length arrays are declared in one of the following ways: In the first three cases, … Read more

Should I set a MaxMetaspaceSize?

As I commented on the previous answer the reasons for setting a limit on those memory pools is different. If your users previously increased the MaxPermSize above the default that probably was either to avoid Full GCs / concurrent mode failures with CMS or because their applications genuinely needed a lot of perm gen space. … Read more

malloc(): memory corruption

What may cause this difference? Basically, the memory allocator allocates pages of memory at once for use by programs, and it gives you a pointer within them (making sure the following space is free for use). Since these pages are usually bigger than 8KiB, you have no issue in your mini-program. But if a larger program is … Read more