Std Array Vs Std Vector Performance

I use the vector template in almost all my c software. Boostcircularbuffer was seven percent faster than stdvector on this test but this is on the very edge of significance given the test setup. The small program should give an answer.
std array vs std vector performance


The title of my blog post is word play.

Std array vs std vector performance. The solution to both of these problems is c11s new stdarray. You should not notice any difference in runtime performance while you still get to enjoy the extra features. In stdarray we can simply state like this stdarray arrgcc abcdefghi abcdefghi. This was the theory of cache lines.

I would say 30 is normal for heap vs stack allocation. I would say the two had very competitive times. Reports performance of c container classes on a variety of operations. A stdvector uses stdallocator which probably uses new to allocate memory from the free store aka the heap at runtime.

I intentionally ignore in my performance test a stdarray because of its limited size. When using the vector template in high performance code we must be aware of several important facts. Like arrays that go on the stack its size must be known at compile time. Stdarray is a very thin wrapper around c style arrays that go on the stack to put it simply they do not use operator new.

A stdvector can never be faster than an array as it has a pointer to the first element of an array as one of its data members. Please use vectors but use them properly if you need speed. Circularbuffer is 7 times as fast as stddeque and 65 times as fast as stdlist. Or even in clang with wall they just need somewhat more explicit expression having to add some more subobject braces like this stdarray arrclangwallfavor abcdefghi abcdefghi.

Stdarray is designed as zero overhead wrapper for c arrays that gives it the normal value like semantics of the other c containers. Constructing an stdarray is easy. Prefer using stl array or vector instead of a c array. The c core guidelines suggest to use a stdvector of a raw array see sl10.

Essentially you can use it whenever you need a dynamic array. A stdarray has a size known at compile time so the memory will most likely be allocated on the stack. The examples above do this. Does it make a difference to read and accumulate all elements from stdvector a stddeque stdlist and stdforwardlist.

There is a myth that for run time speed one should use arrays.

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