Ensure machines configured with enough mapped shared memory

[smlambert]

Noted during the most recent release, SharedClassesAPI failure (an extended.system test) is due to a machine config issue (memory mapped shared memory should get increased).

See AdoptOpenJDK/TSC#99 (comment) for links to failures (noted on machines test-macincloud-macos1014-x64-2, test-macincloud-macos1013-x64-2 though there could be others).

[sxa]

Sounds like you've seen it on AIX too @smlambert? Was that at the adoptopenjdk -1 machine that's been assigned to test.

Also do you know how much it needs to be increased by/to?

[smlambert]

I do not know the details, @pshipton mentioned it, and said the openj9 machines were with plenty of shared memory space. Let's get the details from him. I would hope we can attempt to keep the configuration of machines across the projects to be aligned, this detail must not be captured anywhere in doc or playbooks to date.

[pshipton]

Check with @jdekonin for the setting of SHMMAX on the OpenJ9 Mac machines.

[pshipton]

Or isn't there some older Mac machines that were working? Compare the SHMMAX setting with the new machines.

[jdekonin]

The settings in sysctl.conf I was asked to make were :
kern.sysv.shmmax=125839605760
kern.sysv.shmall=30722560

This is documented in #212

[sxa]

@gdams Can you cover this in the macos playbooks?

[sxa]

Going to close this now it's been merged. If the problem is still there please reopen