DO NOT REPLY [Bug 9708] New: - POST with keep-alive increases process size

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=9708

POST with keep-alive increases process size

           Summary: POST with keep-alive increases process size
           Product: Apache httpd-2.0
           Version: 2.0.36
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Core
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: apxs@fx.org


When sending many large (1MB+) POST requests over a keep-alive connection, the
http process grows in size after each request. For example, after 1000 such
requests, the process size may grow by 4MB. Without keep-alive, the processes do
not grow. This occurs with CGI scripts and custom C modules in Apache 2.0.36.
However, the memory is apparently not leaked -- running the same 1000 requests
again does not cause the size to grow.

The following CGI script (post.cgi) can be used to accept the POST data:

#!/usr/bin/perl -w
use strict;
my $len = 0;
while(<STDIN>) {
    $len += length($_);
}
my $msg = "Received $len bytes\n";
printf "Content-Type: text/plain\nContent-Length: %d\n\n%s",
        length($msg), $msg;
exit;


Next, create a large file:

$ dd if=/dev/zero of=big bs=1024 count=1024

Then send many keep-alive requests to the server. This example uses 'curl':

$ curl -T big `perl -e 'print "http://localhost:8080/post.cgi " for (0..999)'`

Observe the large (7MB) process size:

$ ps -aux | grep lt-http
web  10917  0.0  0.0  3200 1576 ?   S  07:53   0:00 lt-httpd 
web  10918  0.8  0.0  3672 2072 ?   S  07:53   0:01 lt-httpd 
web  10919  4.4  0.1  7620 6016 ?   S  07:53   0:06 lt-httpd

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