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<p class=MsoNormal>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. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I saw an example (<a
href="http://www.onlamp.com/pub/a/onlamp/2006/11/30/lamp-and-spread.html?page=2">http://www.onlamp.com/pub/a/onlamp/2006/11/30/lamp-and-spread.html?page=2</a>)
on how to use spread for point to point communication:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>On machine1:<o:p></o:p></p>
<p class=MsoNormal style='background:#EFEFEF'><span style='font-size:10.0pt;
font-family:"Courier New";color:#003366'>Python 2.4.3 (#2, Apr 27 2006,
14:43:58) <o:p></o:p></span></p>
<p class=MsoNormal style='background:#EFEFEF'><span style='font-size:10.0pt;
font-family:"Courier New";color:#003366'>>>> import spread<o:p></o:p></span></p>
<p class=MsoNormal style='background:#EFEFEF'><span style='font-size:10.0pt;
font-family:"Courier New";color:#003366'>>>> c =
spread.connect('4804', 'testname1', 0, 0)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:#003366'>>>> print c.receive().message<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:#003366'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:#003366'>On machine2:<o:p></o:p></span></p>
<pre><code>Python 2.4.3 (#2, Apr 27 2006, 14:43:58) <o:p></o:p></code></pre><pre><code>>>> import spread<o:p></o:p></code></pre><pre><code>>>> c = spread.connect('4804', 'testname2', 0, 0)<o:p></o:p></code></pre><pre><code>>>> c.multicast(spread.RELIABLE_MESS, '#testname1#machine1', 'this is a point-to-point message')</code><o:p></o:p></pre>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Why do we have to specify <#machine1> when sending a
message from machine2. Isn’t testname1 unique identifier for message 1? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>or is testname1 the group and what we are saying is that
send the message to group testname1 on machine1. Is this the preffered way to
do point to point communication? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Vineet<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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