Are pourdiere VMs memory-limited?

[Yuri]

There is the MAX_MEMORY setting in /usr/local/etc/poudriere.conf that is 
commented out by default.
Is it set in the poudriere on the builder servers?
What happens when it is set to some limit and this limit is exceeded? 
Are these processes swapped or killed in such case?
I am looking into possible reasons why one port fails with runaway error 
on arm64.
One possible reason is that MAX_MEMORY is set and this process is 
getting swapped in and out which makes it to run "forever".


Thanks,
Yuri