Memory use flares up sharply, how to troubleshoot?

[gthb]

Hi,

here's a minimal configuration where I can reproduce this:

error_log  debug.log debug;

events {
    worker_connections  1024;
}

http {
    uwsgi_buffers 64 8k;

    upstream nginx-test.uwsgi {
        server 10.0.0.7:13003;
        least_conn;
    }

    server {
        listen 8080;
        server_name  nginx-test.com;

        location /api/ {
            include uwsgi_params;
            uwsgi_pass nginx-test.uwsgi;
        }
    }
}

Here's a debug log covering server start, a single request that exhibits the
problem, and server shutdown:

http://filebin.ca/1UClE4zzhfZe/debug.log.gz

Everything goes OK for a while, just a few stray mallocs, and then maybe
half a minute into the request (the time varies), after maybe 20-25MB have
been transferred, the flood of mallocs starts:

$ grep malloc: debug.log  | cut -d ' ' -f 2 | uniq -c
      4 14:34:51
      1 14:34:52
      3 14:34:56
      1 14:34:59
      1 14:35:03
      2 14:35:12
   1216 14:35:27
   1135 14:35:28
   2144 14:35:29
   1996 14:35:30
    520 14:35:31

(That last second of mallocs is only smaller because I stopped the client,
so the request was aborted)

I hope that debug log turns up something informative --- and thank you again
for your time on this.

Cheers,

Gulli

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,251964,251988#msg-251988