Julia Kreger 9c20cca362 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. NOTE: This change is largely different than the original change as an intermediate change converted write_image.sh to python. As it is unlikely for us to backport the intermediate change, it is logical for us to just modify the original script. Otherwise the release note is ultimately what is backported for release note tooling continutity. Change-Id: I71a28ec59ec31c691205eb34d9fcab63a2ccb682 Story: 2008928 Task: 42528 (cherry picked from commit 9e4c7052a2)		2021-05-27 08:21:24 -07:00
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write_image.sh	Limit qemu-img execution arenas	2021-05-27 08:21:24 -07:00