response times and network io
joe at joetify.com
Fri Feb 29 20:05:37 MSK 2008
I used httperf to give me the network I/O (KB/s) and response times. I
could probably produce the sar data from each if you would like it. I
assume the response times are due to Nginx not needing to take time to
start up another process/thread?
Igor Sysoev wrote:
> On Thu, Feb 28, 2008 at 08:24:24PM -0600, Joe Williams wrote:
>> please excuse my typo. regarding network I/O nginx uses consistently
>> lower I/O than apache.
>> regardless i am curious about how it processes requests differently to
>> obtain lower response times and network I/O.
> How do you measure network I/O ?
> In short, Apache and nginx use different model for processing requests.
> Apache processes connection in one process or thread while nginx processes
> thousand connections in one process/thread using scaleable methods such
> as kqueue/epoll/etc.
>> thanks for any help you can provide.
>> Joe Williams wrote:
>>> i am performing some httperf tests against apache and nginx. something
>>> i noticed that piqued my interest were the consistency of response
>>> times (0.4 ms each run regardless of number of request, much lower
>>> than apache in all cases) and network I/O (consistently higher than
>>> apache regardless of number of request). it also uses less cpu than
>>> apache and doesn't nearly drive up the load.
>>> are these normal results? is there a mechanism in nginx that keeps the
>>> response times low and consistent? also, is it normal that it uses
>>> more network I/O? if so, what is the cause? to me it would seem like
>>> that it uses more bandwidth to respond to the same number of requests
>>> which seems inefficient.
>>> please correct me if i am wrong. i am just trying to understand the
>>> core differences in how nginx works in comparison to apache and why i
>>> would see these performance differences.
>>> thanks for the help.
>> Name: Joseph A. Williams
>> Email: joe at joetify.com
Name: Joseph A. Williams
Email: joe at joetify.com
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