Neil,

A bit of a tangent, but...

I'd imagine varnish may cut down the load on the dynos.

Heroku may buy you quick scaling, but it also has other infrastructure 
(memcached, varnish) in place to alleviate the load.

--Keenan

On Feb 3, 2011, at 9:17 AM, Christos Zisopoulos wrote:

> 100k/minute !!! And I was excited about our 1.4k/minute...
> 
> As far as I can tell:
> 
> Using the UI at api.heroku.com you can get up to 24 dynos.
> 
> Using the CLI, 100.
> 
>> heroku dynos 101
> !   Dynos not allowed
> 
> My guess is your DB will keel over and die way before the dynos run out. And 
> upgrading the DB is a long winded process: upgrade plan, go into maintenance 
> mode, make a backup, restore the backup... Hours for our app.
> 
> -christos 
> 
> On 3 Feb 2011, at 15:08, Neil Middleton wrote:
> 
>> This week in the UK we had the launch of police.uk, an Django based site 
>> hosted on EC2.  Pretty much straight away it went down through load.  From 
>> talking to the developers, it transpires that they were seeing 100,000+ 
>> requests per minute, and had to draft in several hundred more EC2 instances 
>> to cope.
>> 
>> Which leads me to a tasty hypothetical question.  If for instance I wanted 
>> to launch a site like that on Heroku, are there any limits to where you can 
>> scale too and how long it might take?  I know from experience that I can get 
>> 50 dynos within a couple of seconds, but surely there must be a point where 
>> this is a little harder to provision?  Are there any known limits?  What 
>> happens if I want, say, 5000 dynos right now?  At what point does the DB 
>> layer start to suffer?  How would Heroku handle a site of this magnitude 
>> appearing 'all of a sudden'?
>> 
>> -- 
>> Neil Middleton
>> 
>> http://about.me/neilmiddleton
>> The internet's most comprehensive source for all things Neil Middleton
>> 
>> 
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