bbf57b1c2a
This change removes eventlet usage and explicitly invokes threading instead of eventlet. To do this, it also revises signal handling because this change also moves from an all in one process to a multi-process runtime model. The side effect of this is an increased memory footprint, depending on the process launch model. Change-Id: I184245d67edb1a2543aa24654836392f38777d71 Signed-off-by: Julia Kreger <juliaashleykreger@gmail.com>
35 lines
1.7 KiB
YAML
35 lines
1.7 KiB
YAML
---
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features:
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Ironic now utilizes native OS threads for all periodic and background
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activities. This change is not configurable, and should any issues be
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observed with Ironic's operation, please do not hesitate to report them
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to the developer community.
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critical:
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With the move to the use of native threading, the required memory
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footprint of Ironic has increased. This is a result of both threading
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being used combined with process model changes which were necessary
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to remove the ``eventlet`` library from Ironic. The new process model
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consists of a launcher process with a sub-process which represents the
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actual application workload. In the case of single-process Ironic,
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a single launcher process with two workers is what operators should
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expect.
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As for memory utilization, it is generally tracked by two
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measurements. A Virtual Memory Size (VSZ) which represents memory an
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application has allocated, but may not actively using. The more relevant
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masurement is the Resident Set Size (RSS), which is the amount of memory
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in actual use. Due to the process changes, Operators can expect a 2-3x
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increase in the amount overall system memory in use (RSS). The VSZ
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can be expected to be upwards of 10x larger, and will closely
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track with the current number of active threads being executed upon.
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The Ironic project is aware this may require some operator tuning of
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resource constraints applied to Ironic. However, the improved
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concurrency and performance should be an appropriate trade-off.
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fixes:
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The ``eventlet`` library is no longer invoked by Ironic for the management
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of threads.
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