# Tag Info

6

This is supported, and should work. You should of course be aware of the version differences, i.e. language feature differences, when writing code (e.g. don't do ParallelEvaluate of new-in-9 functions on V8 subkernels). But the control channel plumbing, from MathLink up to the parallel tools, should work. Lightweight Grid itself is quite flexible this way, ...

5

In gridMathematica 8 (the current version), IPFilter is the only way to restrict access. Future versions could provide additional ways, particularly through the kernel initialization code in the Service configuration. Right now there is no information provided to the launched kernel about the launch request that could be used to restrict access, but that ...

4

If each computer has a full license, each license will typically grant access to a minimum of 4 parallel kernels + a control kernel. Also, a home license counts! So if you have a license at work and a home license associated with it one could access (if you had the processors on the respective machines): 4 work kernels + 4 home kernels + 1 control kernel ...

4

I've discovered (at least some of) the answer to this question. One needs to install the Wolfram lightweight grid manager on local AND remote computers. This seems a bit confusing as the title of the program that one sees during the installation, refers to this application as "Wolfram gridMathematica Server with Wolfram Lightweight Grid Manager". A bit ...

3

I just got some feedback on this question from Premier Support. The Wolfram Lightweight Grid Manager runs as a service. As a constantly running service (essentially always listening for a parallel processing job) it always keeps the XServes active so they don't experience the inactivity required to sleep. The solution requires shutting down the service ...

2

Lightweight Grid Manager is a service, implemented as a Tomcat-based web application, that is always on ready to accept requests to launch Mathematica kernels. That is its purpose. You can refer to the official documentation for stopping and starting the service for Mac, Linux, and Windows. If this becomes inconvenient, you could use ssh for remotely ...

1

Well, further experiments have shown that altering my code to: Needs["LightweightGridClient`"] Column[{ CloseKernels[], LaunchKernels[], ParallelEvaluate[$ProcessID], ParallelEvaluate[$MachineName], RemoteServicesAgents[] // ColumnForm}] Which gives me: appears to resolve the problem. This does not explain why the problem occurred or why it ...

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