On Thursday, 5 April 2018 at 20:58:32 UTC, unDEFER wrote:
100K * float[3] = 2356 Kbytes
Why not 1200 Kbytes?
My guess is the reallocation triggered by ~= just passed the
double threshold there.
When the runtime appends, it usually reserves (about) 2x of what
it actually needs. This is a performance optimization in most
cases because it cuts down on extra allocations, copies, and
fragmentation.
But if you catch it right at the edge, after it doubles but
before it is filled in by more loop, it can look like excess
memory.
It is also possible that you are just seeing some fixed overhead
with the process.
