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Jetstream allocations are awarded exclusively through the eXtreme Science and Engineering Discovery Environment (XSEDE). XSEDE provides XSEDE User Portal (XUP) accounts free of charge. XSEDE allocations require that the PI be a US-based researcher.
A guide with more detail on Jetstream allocations is available online at https://portal.xsede.org/web/guest/resources/overview. Samples of successful requests are available here, https://portal.xsede.org/successful-requests .
4. Submit allocation request. At this point, all entered information is validated, errors or omissions are flagged.
Allow 1-2 business days for your application to go through the approval process.
Detailed information about the allocation request process, with screenshots, is here, https://portal.xsede.org/allocation-request-steps.
To review the types of allocations XSEDE and the process to get an allocation, here are some links you might find useful:
Applications for startup allocations will only be accepted once. After the startup runs out it is best to apply for a research allocation.
If you already have an XSEDE allocation and need to request additional service units (SUs) the PI or co-PI may submit a request via the XSEDE User Portal. For instructions on how to submit the request, see How do I request supplemental service units for an XSEDE allocation?
Additional CPUs and memory may be requested via Atmosphere. See How to request additional resources on Jetstream.