Are multiple realloc more expensive than a huge malloc?

If you can spare the memory to make the large up-front allocation, and it gives a worthwhile performance increase, then by all means do it.

The drawback is that if you are not using all that space you are taking up a large chunk of memory which might be needed. If you know exactly how many bytes you need it is going to be more efficient to allocate at once, due to system call overhead, then to allocate it piece by piece. Usually you might have an upper bound but not know the exact number.

Taking the time to malloc up the space to handle the upper bound might take 1 second. If however, this particular case only has half of the upper bound it might take .75 seconds allocating piece by piece. So it depends on how close to the upper bound you think you are going to get.

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