How to size swap to capture core dumps?

I think rule of thumb is swap needs to be at least as big as RAM. You may be able to get away with less if cores are compressed I don't know if they are.
 
I have servers with 32GB, 64GB and 128GB RAM and the SWAP is 16GB.

From the handbook:

"Minidumps are the default dump type as of FreeBSD 7.0, and in most cases will capture all necessary information present in a full memory dump, as most problems can be isolated only using kernel state."
 
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