Request_time exstreamly larger than upstream_response_time for some queries when using fastcgi

Server NGINX
1

Hi，
I run python in backend, and use nginx to proxy queries to python by
using
fastcgi. I found some strange things in my nginx log those days. Some
queries’
$request_time are up to 40 seconds which their $upstream_response_time
are less
than 1 second.

Here is my fastcgi related conf.
fastcgi_max_temp_file_size 0;
fastcgi_param PATH_INFO $fastcgi_script_name;
fastcgi_param SCRIPT_NAME “”;
fastcgi_pass python_backend;
fastcgi_buffers 1024 8K;

Do you guys know what’s the problem?

Chao

2

Does anybody have a clue about this problem?

From: Tian C. [email protected]
To: “[email protected]” [email protected]
Sent: Wednesday, November 21, 2012 1:02 PM
Subject: request_time exstreamly larger than upstream_response_time for
some queries when using fastcgi

Hi，
I run python in backend, and use nginx to proxy queries to python by
using
fastcgi. I found some strange things in my nginx log those days. Some
queries’
$request_time are up to 40 seconds which their $upstream_response_time
are less
than 1 second.

Here is my fastcgi related conf.
fastcgi_max_temp_file_size 0;
fastcgi_param PATH_INFO $fastcgi_script_name;
fastcgi_param SCRIPT_NAME “”;
fastcgi_pass python_backend;
fastcgi_buffers 1024 8K;

Do you guys know what’s the problem?

Chao

3

I found some strange things in my nginx log those days. Some queries’
$request_time are up to 40 seconds which their $upstream_response_time are
less than 1 second.

$request_time is time since start of the request (first bytes read from
client) till end of the request (last bytes are sent to client and
logging
happens) - so while the backend can generate the response in 1 second
there
might be clients with slow connections or even not waiting for the
response
(closing it) etc.

rr

4

Hi rr,

Thanks for your explain. Some queries’ body sent is just about 1K bytes,
however the$request_time is up to 40 seconds, so i think the connection
is tooslow. Is there a way fordiagnosticwhat happened in that time for
those slow queries?

Thanks,
Chao

From: Reinis R. [email protected]
To: [email protected]
Sent: Thursday, November 22, 2012 12:04 PM
Subject: Re: request_time exstreamly larger than upstream_response_time
for some queries when using fastcgi

I found some strange things in my nginx log those days. Some queries’
$request_time are up to 40 seconds which their $upstream_response_time are less
than 1 second.

$request_time is time since start of the request (first bytes read from
client) till end of the request (last bytes are sent to client and
logging happens) - so while the backend can generate the response in 1
second there might be clients with slow connections or even not waiting
for the response (closing it) etc.

rr