7df431c81e
Re-using the classic os_workers fact but changing the minimum from 2 to 4, specific to the fact Heat Engine can be stressed out. Also cap to 24 workers at maximum. Change-Id: I31d02bea6dd55d65a7014503398adc4422ce7303
64 lines
1.8 KiB
Ruby
64 lines
1.8 KiB
Ruby
#
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# We've found that using $::processorcount for workers/threads can lead to
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# unexpected memory or process counts for people deploying on baremetal or
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# if they have large number of cpus. This fact allows us to tweak the formula
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# used to determine number of workers in a single place but use it across all
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# modules.
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#
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# The value for os_workers is max between '(<# processors> / 4)' and '2' with
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# a cap of 8.
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#
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# This fact can be overloaded by an external fact from /etc/factor/facts.d if
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# a user would like to provide their own default value.
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#
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Facter.add(:os_workers_small) do
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has_weight 100
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setcode do
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processors = Facter.value('processorcount')
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[ [ (processors.to_i / 4), 2 ].max, 8 ].min
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end
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end
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#
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# The value above for os_workers performs 3x worse in many cases compared to
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# the prevuous default of $::processorcount.
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#
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# Based on performance data [1], the following calculation is within 1-2%.
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#
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# The value for os_workers is max between '(<# processors> / 2)' and '2' with
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# a cap of 12.
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#
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# [1] http://elk.browbeatproject.org:80/goto/a23307fd511e314b975dedca6f65425d
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#
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Facter.add(:os_workers) do
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has_weight 100
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setcode do
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processors = Facter.value('processorcount')
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[ [ (processors.to_i / 2), 2 ].max, 12 ].min
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end
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end
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#
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# For cases where services are not co-located together (ie monolithic).
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#
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Facter.add(:os_workers_large) do
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has_weight 100
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setcode do
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processors = Facter.value('processorcount')
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[ (processors.to_i / 2), 1 ].max
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end
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end
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#
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# Heat Engine service can be more stressed than other services, so
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# a minimum of 4 and maximum of 24 workers should be fine, still
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# calculating with the number of processors.
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#
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Facter.add(:os_workers_heat_engine) do
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has_weight 100
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setcode do
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processors = Facter.value('processorcount')
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[ [ (processors.to_i / 2), 4 ].max, 24 ].min
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end
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end
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