On 25/09/2007, Michal Taborsky - Internet Mall < michal.taborsky@mall.cz> wrote:

Hmm, if it works, it will be interesting. We are running a more simple
version of this. We have a cloud (read "two", but can be more) of load
balancers and a cloud of application servers. We can add and remove
servers from/to these clouds without interuption of service. But to put
it all on one server, that's a new one. The question is, is the overhead
worth it? Because I imagine the communication between the nodes will put
some stress on the machines and as the number of nodes grows, it might
spend more processor time (and electricity) doing the inter-node
communication than actually doing any work.

If you get it up, let us know.

MT.

Callum Macdonald napsal(a):
> Hi Michal,
>
> Thanks for your response, that's exactly the sort of number I need.
>
> The idea is not to use pound, but perhaps to develop a modified version of
> pound.
>
> My concept is that a group of machines will act as a "cloud" (nothing new
> there). Each machine will connect to others on the network and exchange live
> data about free CPU cycles and free memory. So in principle, all load
> balancers will know the state of most of the other machines at any given
> time. They will then allocate the traffic based on various algorithms.
>
> The idea is that any machine on the network can receive the request, but
> will offload the request to another machine on the grid if it needs to.
>
> Potentially, if using something like Amazon EC2, additional machines could
> be brought up automatically to cope with additional load. Then as load
> reduces, machines could be taken offline automatically.
>
> At this stage, it's just a concept I'm throwing around.
>
> Thanks again for your feedback.
>
> Cheers - Callum.
>
> On 24/09/2007, Michal Taborsky - Internet Mall < michal.taborsky@mall.cz>
> wrote:
>> Hello Callum,
>>
>> I doubt you will get any meaningful answer. If you asked how many
>> requests per second a single pound balancer can handle, that we can tell
>> you (my rough estimate would be about 1000 req/sec per one processor,
>> assuming you don't run out of IP resources). But how many backends?
>> You'll have to try.
>>
>> I see a design problem with your suggestion. This just isn't what pound
>> was made for. How will you determine, that the local server cannot
>> handle the request?
>>
>> The best thing you can do is estimate how many balancers you will need
>> and dedicate that many servers for balancing. Combining backend and
>> balancer on one machine does not make much sense to me.
>>
>> Bye,
>> Michal
>>
>>
>>
>> Callum Macdonald napsal(a):
>>> Anyone got any rough estimates on this? Or any performance data for how
>> much
>>> traffic a server can handle?
>>>
>>> Cheers - Callum.
>>>
>>> On 21/09/2007, Callum Macdonald < callum.macdonald+pound-list@gmail.com>
>>> wrote:
>>>> G'day,
>>>>
>>>> I have a (relatively) simple question to which I can't find the answer
>>>> online.
>>>>
>>>> How many servers (assuming similar spec) can a single load balancer
>>>> handle?
>>>>
>>>> For example, could 1 pound server manage requests to 12 servers (I'm
>>>> assuming yes), what about 200 servers, or 2'000 servers.
>>>>
>>>> I'm working on an idea around scaling web applications by making each
>> node
>>>> on the grid a combination of an application server and a load balancer
>> (so
>>>> it would offload requests it can't deal with to other servers). But
>> this
>>>> ratio may be the critical number... :)
>>>>
>>>> Any advice / suggestions you can offer would be greatly appreciated.
>>>>
>>>> Cheers,

--
Michal Táborský
chief systems architect
Internet Mall, a.s.

Internet Mall - obchody, které si oblíbíte
<http://www.MALL.cz >

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