Re: [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs

[John Snow <jsnow@redhat.com>]

On 05/06/2015 02:25 AM, Markus Armbruster wrote:
> John Snow <jsnow@redhat.com> writes:
> 
>> Instead of letting printf and friends do this for us
>> one byte at a time, fill a buffer ourselves and then
>> send the entire buffer in one go.
>>
>> This gives a moderate speed improvement over the old
>> method.
> 
> Out of curiosity: how much of the improvement is due to doing our own
> buffering instead of printf()'s (assuming the stream is buffered), and
> how much is due to doing our own hex formatting instead of printf()'s?
> 

Out of ignorance: How would I measure?