[Spread-users] Newbie question on how to use spread for point to point communication (in txt)

[Vineet Jain (gmail)]

I'm sorry that my last email went out as html. Here is the text version:

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I've installed spread 4.0 package and the updated python  module and
everything seems to be working fine. I have a grid of about 20 compute nodes
each running about 4 different services. Each service runs an event loop and
I was thinking of using spread as the messaging layer between the services
on the different hosts. 

 

Question 1

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I saw an example
(http://www.onlamp.com/pub/a/onlamp/2006/11/30/lamp-and-spread.html?page=2)
on how to use spread for point to point communication:


 


On machine1:


Python 2.4.3 (#2, Apr 27 2006, 14:43:58)


>>> import spread


>>> c = spread.connect('4804', 'testname1', 0, 0)


>>> print c.receive().message


 


On machine2:


Python 2.4.3 (#2, Apr 27 2006, 14:43:58)


>>> import spread


>>> c = spread.connect('4804', 'testname2', 0, 0)


>>> c.multicast(spread.RELIABLE_MESS, '#testname1#machine1', 'this is a
point-to-point message')


 


Why do we have to specify <#machine1> when sending a message from machine2.
Isn't testname1 unique identifier for message 1?  or is testname1 the group
and what we are saying is that send the message to group testname1 on
machine1. Is this the preferred way to do point to point communication?


 

Question 2

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I'm looking to eventually migrate my application to amazon's ec2 cloud
service. Where you can rent out compute nodes by the hour. Will spread work
in that environment. I don't plan on having more than 400-500 messages (max)
per second cumulative between all the nodes. My main concern with amazon's
ec2 service is that all the servers that I rent out might not have the same
broadcast service. If I'm looking to do only point to point communication
why do I even need to have a broadcast address?

 

Thanks,

 

Vineet

 

 

 

 


Thanks,


 


Vineet


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