[Mailman-Users] Questions regarding mailman tunning FAQ 6.6

[Xueshan Feng]

I am looking into ways to improve performance for our mailman server. It
currently serves 15,000 mailing list, and the largest list has more than
10,000 members. We are running mailman 2.1.8 with Postfix. We have load
spike at 20, and during busy hours, load average is around 10.  Messages
delays do occur but not too bad yet. I want to be more proactive to
prevent things from getting worse. 

Mailman FAQ 6.6 mentioned the following configuration tuning for
qrunner:

|Set your qrunner proc to live longer, and extend the lock life: 

|QRUNNER_LOCK_LIFETIME = hours(10)
|QRUNNER_PROCESS_LIFETIME = minutes(15)
|QRUNNER_MAX_MESSAGES = 300
|Set these to 20 hours, 2 hours and 50000

I cannot find these variables used anywhere in source code, other than
mentioned in NEWS file in the mailman release.

Thanks in advance for your help,

Xueshan
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