ironic-python-agent/releasenotes/notes/limit-qemu-img-malloc-arena-025ed84115481eae.yaml
Julia Kreger 9e4c7052a2 Limit qemu-img execution arenas
qemu-img attempts to launch multiple threads by default *and*
attempts to have multiple memory allocation arenas to operate
from. While multithreading can be good for performance, this
pattern and the memory footprint for process launch and
dependencies can turn the memory footprint for a cirros image
conversion (16MB) into 1.2GB of memory being asked for by the
qemu-img tool.

In order to limit this impact, as the default number of arenas
is governed by the number of CPUs times the number 8, it seems
reasonable to lower this to a more reasonable number which
also helps keep our possible memory footprint from being exceeded.

Change-Id: I71a28ec59ec31c691205eb34d9fcab63a2ccb682
Story: 2008928
Task: 42528
2021-05-26 13:04:46 -07:00

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307 B
YAML

---
fixes:
- |
Fixes failures with disk image conversions which result in memory
allocation or input/output errors due to memory limitations by limiting
the number of available memory allocation pools to a non-dynamic
reasonable number which should not exceed the available system memory.