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Posted to users@httpd.apache.org by Hu Hailin <i...@h2l.name> on 2010/07/14 16:19:40 UTC
[users@httpd] what does 0 mean of serving time
Hi,
http://httpd.apache.org/docs/2.2/en/mod/mod_log_config.html#formats
I'm using %D to log the time taken to serve requests.
I found the time might be 0 in nonspecific requests. The rate of 0
serving time goes the same trend with server load.
Does it mean some kind of timeout?
Thanks.
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Re: [users@httpd] what does 0 mean of serving time
Posted by Jeff Trawick <tr...@gmail.com>.
On Wed, Jul 14, 2010 at 11:56 AM, Hu Hailin <i...@h2l.name> wrote:
> the os of my box is CentOS 5.3 and httpd is the built-in one.
>
>> it may mean that the requests didn't take long to server AND the clock
>> is not high resolution
>
> I thought so as well, but about 90% of the requests are around
> 10_000-100_000µs. Meanwhile 0µs requests are about 5%.
> It's hard to believe that is a resolution issue.
> Also the rate of 0µs request goes up with server's load going up, not
> a good sign, I guess.
>
> Arrrr, it might be something like the requests under 1000µs goes to
> 0µs into log file by chance?
no idea what you are encountering
I just tried %D with built-in httpd on CentOS 5.4 on VMWare on Windows
7 and saw requests in the 3-400 microsecond range, seemingly with
microsecond resolution.
>
> On Thu, Jul 15, 2010 at 12:20 AM, Jeff Trawick <tr...@gmail.com> wrote:
>> On Wed, Jul 14, 2010 at 10:19 AM, Hu Hailin <i...@h2l.name> wrote:
>>> Hi,
>>>
>>> http://httpd.apache.org/docs/2.2/en/mod/mod_log_config.html#formats
>>>
>>> I'm using %D to log the time taken to serve requests.
>>> I found the time might be 0 in nonspecific requests. The rate of 0
>>> serving time goes the same trend with server load.
>>>
>>> Does it mean some kind of timeout?
>>
>> no
>>
>> it may mean that the requests didn't take long to server AND the clock
>> is not high resolution
>>
>> is this Windows? if I understand correctly, expensive (in CPU)
>> mechanisms are required to get good resolution on Windows
>>
>> ---------------------------------------------------------------------
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>> See <URL:http://httpd.apache.org/userslist.html> for more info.
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>>
>>
>
>
>
> --
> islue
>
> ---------------------------------------------------------------------
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Re: [users@httpd] what does 0 mean of serving time
Posted by Hu Hailin <i...@h2l.name>.
the os of my box is CentOS 5.3 and httpd is the built-in one.
> it may mean that the requests didn't take long to server AND the clock
> is not high resolution
I thought so as well, but about 90% of the requests are around
10_000-100_000µs. Meanwhile 0µs requests are about 5%.
It's hard to believe that is a resolution issue.
Also the rate of 0µs request goes up with server's load going up, not
a good sign, I guess.
Arrrr, it might be something like the requests under 1000µs goes to
0µs into log file by chance?
On Thu, Jul 15, 2010 at 12:20 AM, Jeff Trawick <tr...@gmail.com> wrote:
> On Wed, Jul 14, 2010 at 10:19 AM, Hu Hailin <i...@h2l.name> wrote:
>> Hi,
>>
>> http://httpd.apache.org/docs/2.2/en/mod/mod_log_config.html#formats
>>
>> I'm using %D to log the time taken to serve requests.
>> I found the time might be 0 in nonspecific requests. The rate of 0
>> serving time goes the same trend with server load.
>>
>> Does it mean some kind of timeout?
>
> no
>
> it may mean that the requests didn't take long to server AND the clock
> is not high resolution
>
> is this Windows? if I understand correctly, expensive (in CPU)
> mechanisms are required to get good resolution on Windows
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
>
--
islue
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Re: [users@httpd] what does 0 mean of serving time
Posted by Jeff Trawick <tr...@gmail.com>.
On Wed, Jul 14, 2010 at 10:19 AM, Hu Hailin <i...@h2l.name> wrote:
> Hi,
>
> http://httpd.apache.org/docs/2.2/en/mod/mod_log_config.html#formats
>
> I'm using %D to log the time taken to serve requests.
> I found the time might be 0 in nonspecific requests. The rate of 0
> serving time goes the same trend with server load.
>
> Does it mean some kind of timeout?
no
it may mean that the requests didn't take long to server AND the clock
is not high resolution
is this Windows? if I understand correctly, expensive (in CPU)
mechanisms are required to get good resolution on Windows
---------------------------------------------------------------------
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See <URL:http://httpd.apache.org/userslist.html> for more info.
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" from the digest: users-digest-unsubscribe@httpd.apache.org
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