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For memory, the default is to be allocated a proportional amount of available RAM from the node. So, for example, if you request one CPU core on a node that has 28 cores and 125GB 104GB of RAM, the default will be about 3.7GB of memory. (A corollary is that if you request all of the cores for a node, you'll get all of the available RAM by default.) Some nodes have more cores and/or RAM, so this may vary, but 3.7GB is currently the smallest default for all Talapas nodes. See Machine Specifications for more detailed information about the available nodes.
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