We upgraded the
Mono/.NET framework in Toolforge/GridEngine from the 3.x
version to 5.x [0].
We discovered that some tweaking is required due to some weird behavior
regarding memory allocation by the framework [1].
The first symptom you will see is your boot doing high CPU load (spins).
The fix is easy, just telling Mono that more memory is available when
running the tool/bot. But you require to cancel your job submissions and
resend. Please refer to the phabricator bug [1] for more details.
Sorry for the inconvenience.
[0]
https://phabricator.wikimedia.org/T194665
[1]
https://phabricator.wikimedia.org/T195834
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