74e0f5a317
Since we have merged 2 keystone services(public and admin) into one, we need to double keystone workers so that we have the same number of workers, which is necessory to avoid performance degradation. This patch introduced new facter, os_workers_keystone, which returns 2 x os_workers . Change-Id: I737fb14739a69ac12c39c7faf6dd2be1f772daa6
77 lines
2.2 KiB
Ruby
77 lines
2.2 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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#
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# Since we have merged keystone admin and keystone public into a single
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# keystone instance, we need doubled workers to have the same number
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# of workers in total to avoid performance degradation.
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#
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Facter.add(:os_workers_keystone) 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 ].max, 24 ].min
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end
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end
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