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| Restriction on number of compute nodes in msgflow |
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| kishoreraju |
 Posted: Fri Sep 05, 2008 11:23 am Post subject: Restriction on number of compute nodes in msgflow |
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Disciple
Joined: 30 Sep 2004
Posts: 156
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hi all,
Is There any restriction on number of compute nodes that we can use in flow. |
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| chrisc |
| Posted: Sun Sep 07, 2008 3:40 pm Post subject: |
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Voyager
Joined: 19 Mar 2006
Posts: 77
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I haven't heard of - or come across - any limitation on the number of compute nodes, but what we have observed is that increasing the number of compute nodes exponentially increases the amount of memory required.
I'm not sure of the exact numbers, but it may be something like 5-10% extra memory per compute node.
My understanding is that this is because any node that has InputXXX and OutputXXX message trees keeps a copy of both the input and output for the purposes of rolling them back if there is an exception. This can add up rapidly, particularly if you are dealing with large messages. (Keep in mind that a small physical message on a queue can turn into a substantial amount of memory in the broker by the time all the parsing etc has been done.)
If you need to split your logic across many nodes, one alternative is to use non-transforming nodes where you are doing logic but not message transformation. For example, a filter node or a database node can manipulate the Environment tree but not the message, but this may be sufficient for what you're trying to do.
Hope that helps.
(There may ALSO be a limitation on compute nodes, but I've neveer reached it and would suggest you're designing your flows wrong if you do hit it!) |
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| kishoreraju |
| Posted: Mon Sep 08, 2008 5:39 am Post subject: |
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Disciple
Joined: 30 Sep 2004
Posts: 156
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Thanks for ur quick response.
Even i never heard anything like this type of restriction.To be sure i posted this question. |
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