fwrite() - effect of size and count on performance

Question

There seems to be a lot of confusion regarding the purpose of the two arguments \'size\' and \'count\' in fwrite(). I am trying to figure out which will be faster -

Answer 1

The purpose of two arguments gets more clear, if you consider ther return value, which is the count of objects successfuly written/read to/from the stream:

fwrite(src, 1, 50000, dst); // will return 50000
fwrite(src, 50000, 1, dst); // will return 1

The speed might be implementation dependent although, I don't expect any considerable difference.