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Re: [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs
From: |
John Snow |
Subject: |
Re: [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs |
Date: |
Wed, 06 May 2015 10:12:18 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 05/06/2015 02:25 AM, Markus Armbruster wrote:
> John Snow <address@hidden> 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?
- [Qemu-devel] [PATCH v3 0/5] qtest: base64 r/w and faster memset, John Snow, 2015/05/05
- [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs, John Snow, 2015/05/05
- Re: [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs, Markus Armbruster, 2015/05/06
- Re: [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs, Eric Blake, 2015/05/07
- Re: [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs, Markus Armbruster, 2015/05/08
- Re: [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs, John Snow, 2015/05/08
- Re: [Qemu-devel] [PATCH v3 4/5] qtest: precompute hex nibs, Eric Blake, 2015/05/08
[Qemu-devel] [PATCH v3 1/5] qtest: allow arbitrarily long sends, John Snow, 2015/05/05