FAQs

Why do I get the java error "Could not reserve enough space for object heap"?

When running an RCE Powered Application -- for example an RCE Shell -- you have the opportunity to reserve a requested amount of system memory.

The Java JRE is not aware of the resource limit you have set, and will try (and fail) to grab as much of the system memory as is free. (Java bug 8043516)

This will typically result in one of the following errors:

"Could not reserve...

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How to exit a job from a shell OR cannot start RCE job -- too many CPUs

The commands below will help you exit an RCE job from a terminal if the application window has disappeared, or you need to exit it and do not have access to your NX session. This can be accomplished by using an ssh client and connecting to rce.hmdc.harvard.edu, or opening a terminal window in the RCE. 

The same commands can be used If you are running into an error starting a new RCE job due to too many CPU's in use, you need to terminate your jobs that were tied to an old nx session. The commands that are highlighted below should enable you to remove...

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What is the cost to use the RCE?

The RCE is free to use for qualified individuals in the pursuit of social science research, within certain limits.

If your needs exceed the capacities of the shared RCE environment, we can work with you to establish dedicated RCE resources for your exclusive use. If you are planning a large project, please contact us prior to your grant application so that we can assist in budgetary estimation.

The standard limits...

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How do I get an account, or get help?

For all inquiries related to the HMDC RCE, please contact our support helpdesk.

For fastest service, please email directly support@help.hmdc.harvard.edu. Or, you may also call 617-495-4734 (x54734) from 9AM-5PM weekdays.

If your question is not answered here on our RCE support website, you may also find the information you need on our User Services website, which covers topics relating to the HMDC RCE and...

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