Nat,
With the following code, I was successful in crashing the server, but I'm
not sure if it meets the requirements you're wanting. It uses 3 files:
application.cfm, test1.cfm, and test2.cfm. All I did was create a new folder
with the 3 files in it, opened two separate browser windows with test1 in
one window and test2 in another. I loaded both, hit refresh twice, and
received the "Request canceled or ignored by serverServer busy ..." error in
the first window and the "An error occurred while evaluating the expression:
Application.CrashMe" in the other window. When the count was 1000-10000, it
worked fine; 50,000 and two successive refreshes killed the whole server.
Application.cfm:
===============
<cfapplication name="test">
Test1.cfm:
===========
<cfif not isdefined("Application.CrashMe")>
<cflock scope="APPLICATION" timeout="5" type="EXCLUSIVE">
<cfset Application.CrashMe = "Kaboom!">
</cflock>
</cfif>
<cfloop from="1" to="50000" index="i">
<cfset Ouch = Application.CrashMe>
</cfloop>
Test2.cfm:
===========
<cfloop from="1" to="50000" index="i">
<cfset Ouch = Application.CrashMe>
</cfloop>
I have screen shots if you want to see them.
Dain Anderson
Caretaker, CF Comet
http://www.cfcomet.com/
----- Original Message -----
From: "Nat Papovich" <[EMAIL PROTECTED]>
To: "Fusebox" <[EMAIL PROTECTED]>
Sent: Wednesday, April 25, 2001 1:32 PM
Subject: the $5 bet - crash a server with unlocked application scope READs
> The subject pretty much says it all, but I'd like to see someone crash a
> server or produce a pcode exception error or (getting easy here) produce
one
> of those "donteverusethisvariablenameinyourcfmlcode123456789" errors by
> using concurrent unlocked application scoped variable reads.
>
> I've already built a frameset with 50 frames, each frame page looping over
> the output of an application variable 100,000 times. Now out of those 5
> million read hits to my application variable that occur within the space
of
> maybe 10 seconds, NONE produce any error whatsoever, no matter how many
> times I try. Of course, doing 5 million WRITE hits will produce errors
> pretty quickly, and eventually destroy my server. Anybody have Silk or
Load
> Runner?
>
> I'm not interested in session variable locking issues, nor with cfquery's
> cachedwithin attribute. I only want to see application variable reads
> causing detrimental effects to a CF server.
>
> $5 to be delivered at the next major CF conference, should I be able to
> reproduce the error on my machine (single proc p3-650, 256 mb ram, CF 5
Beta
> 3, PWS, NT 4 Workstation SP6). The cash only goes to the first person...
>
> Good luck - I don't think it's possible!
>
> NAT
> Nat Papovich
> Webthugs Consulting
> ICQ 32676414
> "If it was hard to write,"
> says the Real Programmer,
> "it should be hard to understand."
>
>
>
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