The specific details for PROC MIXED are here:
https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.3/statug/statug_mixed_details58.htm#statug_mixed017845
Memory determination depends on a lot of things. For example, how one specifies the model can make a big difference. A statement such as
random A A*B;
can use more memory (and be slower to fit) than using:
random int B / sub=A;
because the latter is processed by subjects.
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