How to make the Apache Http Server Crash by "flood"?

[Neo Jia]

All,

I am working on my research about the server crash pattern. Now, I would
like to make the Apache Http Server Crash due to the heavy load of
requests. So I am using the handy tool - flood provided by Apache. But
it seems not always generate a stable incremental request load each
time. I mean that sometimes the load seems decreased, while there is no
information about the FAIL in the output file, also.

And, I am curious which parameter in the xml configuration file can help
me to increase the load?

I always getting such output when running the flood. (XXX is the URL I
am testing.)

./flood ./examples/apache.xml > apache

open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.
open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.
open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.
open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.
open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.
open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.
open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.
open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.
open request failed (http://XXX:80).
Error running farmer 'Joe': Cannot assign requested address.

The following is the apache.xml I am using.

<?xml version="1.0"?>
<!DOCTYPE flood SYSTEM "flood.dtd">
<flood configversion="1">
<urllist>
<name>Test Hosts</name>
<description>A bunch of hosts we want to hit</description>
<url>http://XXX:80</url>
</urllist>

<profile>
<name>Example Profile</name>
<description>A Test Round Robin Configuration</description>

<useurllist>Test Hosts</useurllist>

<profiletype>round_robin</profiletype>
<socket>keepalive</socket>
<verify_resp>verify_200</verify_resp>
<report>relative_times</report>

</profile>
<farmer>
<name>Joe</name>

<time>10</time> //
The most interesting part is that when I increase the time, it seems
should generate much more load, but it not.
<useprofile>Example Profile</useprofile>
</farmer>
<farm>
<name>Bingo</name>
<usefarmer count="10">Joe</usefarmer>
</farm>
<seed>1</seed>
</flood>



Thanks,
Neo
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