On Sat, Sep 23, 2006 at 09:58:02AM -0400, Paul Hudak wrote:

Thanks Don. I alerted our IT staff this morning, and they seem to have things working again, although here is their final response:

The web server had over 150 client connections which exceeded its limit. I restarted the web server and all is well.

I'll keep and eye on it and see if someone is trying a denial of server attack, or it could be you need a newer faster machine. :-)

So either Haskell is getting really popular (on a Friday night?) or there's something fishy going on.

Yesterday there was a link to haskell.org on reddit.com, precisely to http://haskell.org/haskellwiki/Simple_unix_tools . The server experienced something like a slashdot effect. Best regards Tomasz

I have been linked before on slashdot to my humble web server (all 333MHz of awesome CPU power). I can attest to the effect that you are describing. Tony Morris http://tmorris.net/ Tomasz Zielonka wrote:

On Sat, Sep 23, 2006 at 06:03:41PM +0200, Tomasz Zielonka wrote:

...

Yesterday there was a link to haskell.org on reddit.com, precisely to http://haskell.org/haskellwiki/Simple_unix_tools . The server experienced something like a slashdot effect.

On the other hand, I think haskell.org was linked from reddit before and I don't remember similar problems. Perhaps reddit got more popular or the link was also put on other similar sites.

Best regards Tomasz _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

On Sat, 2006-09-23 at 09:58 -0400, Paul Hudak wrote:

Thanks Don. I alerted our IT staff this morning, and they seem to have things working again, although here is their final response:

The web server had over 150 client connections which exceeded its limit. I restarted the web server and all is well.

I'll keep and eye on it and see if someone is trying a denial of server attack, or it could be you need a newer faster machine. :-)

So either Haskell is getting really popular (on a Friday night?) or there's something fishy going on.

I've noticed this happen several times in the past. It would have 150 hung connections but not very high cpu or network usage. On those occasions I restated httpd to get things going again. Looking at the httpd access logs it looked to me like an errant indexing bot. One example of something we might want to ban bots from is from accessing all past revisions and diffs of wiki pages. But generally we probably just need to look at the logs and try and see what's going on. Duncan

On 9/23/06, Donald Bruce Stewart wrote:

paul.hudak:

...

Thanks Don. I alerted our IT staff this morning, and they seem to have things working again, although here is their final response:

The web server had over 150 client connections which exceeded its limit. I restarted the web server and all is well.

I'll keep and eye on it and see if someone is trying a denial of server attack, or it could be you need a newer faster machine. :-)

So either Haskell is getting really popular (on a Friday night?) or there's something fishy going on.

Hmm. Looks like its gone down again?

And again...

Seems fishy...

Very. Is it possible that some resource on the haskell.org server isn't accessible but also doesn't time out when requested? I've seen things like that with samba shares where the requested file is never fetched and the process pretty much goes to sleep until it is fetched. Just an idea. Jason

Sorry to bother everyone with this, but some input I've gotten from the community has been helpful. Haskell.org is up again, and here is the latest action on part of our IT staff: If anything further develops I'll let you know. Thanks, -Paul I had to reboot haskell this AM it was really hung. My first assumption is abuse by web crawlers. I have denied access to all web crawlers at the moment while I continue looking further into this and the load is staying low. I'll keep you posted. Paul Hudak wrote:

We are looking into it. Sorry for the inconvenience. -Paul

Jason Dagit wrote:

...

On 9/23/06, Donald Bruce Stewart wrote:

...

Hmm. Looks like its gone down again?

And again...

...

Seems fishy...

Very.

Paul Hudak wrote:

I had to reboot haskell this AM it was really hung. My first assumption is abuse by web crawlers. I have denied access to all web crawlers at the moment while I continue looking further into this and the load is staying low. I'll keep you posted.

I've seen this kind of behavior when some stupid referer spammers open hundreds of connections at the same time, typically requesting some dynamic resource, DDoSing the system. I have installed an iptables-based tar pit on my own server that seems to have solved the problem.