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While multithreading can be good for performance, this\npattern and the memory footprint for process launch and\ndependencies can turn the memory footprint for a cirros image\nconversion (16MB) into 1.2GB of memory being asked for by the\nqemu-img tool.\n\nIn order to limit this impact, as the default number of arenas\nis governed by the number of CPUs times the number 8, it seems\nreasonable to lower this to a more reasonable number which\nalso helps keep our possible memory footprint from being exceeded.\n\nChange-Id: I71a28ec59ec31c691205eb34d9fcab63a2ccb682\nStory: 2008928\nTask: 42528\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/ironic-python-agent/commit/9f169a01da7af97429ab39fda2a9befb8c1ef217"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/ironic-python-agent/commit/9f169a01da7af97429ab39fda2a9befb8c1ef217"}]},"branch":"refs/heads/master"},"9e4c7052a2fd9aac03858db696bf1ea9487f15e6":{"kind":"REWORK","_number":3,"created":"2021-05-26 20:04:50.000000000","uploader":{"_account_id":11655,"name":"Julia Kreger","email":"juliaashleykreger@gmail.com","username":"jkreger","status":"Flying to the moon with a Jetpack!"},"ref":"refs/changes/25/793225/3","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/ironic-python-agent","ref":"refs/changes/25/793225/3","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/ironic-python-agent refs/changes/25/793225/3 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/ironic-python-agent refs/changes/25/793225/3 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/ironic-python-agent refs/changes/25/793225/3 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/ironic-python-agent refs/changes/25/793225/3"}}},"commit":{"parents":[{"commit":"2172122b879dc4eddff34d97a686e3d23f4fae23","subject":"Merge \"Rewrite write_image.sh in Python\"","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/ironic-python-agent/commit/2172122b879dc4eddff34d97a686e3d23f4fae23"}]}],"author":{"name":"Julia Kreger","email":"juliaashleykreger@gmail.com","date":"2021-05-26 18:55:44.000000000","tz":-420},"committer":{"name":"Julia Kreger","email":"juliaashleykreger@gmail.com","date":"2021-05-26 20:04:46.000000000","tz":-420},"subject":"Limit qemu-img execution arenas","message":"Limit qemu-img execution arenas\n\nqemu-img attempts to launch multiple threads by default *and*\nattempts to have multiple memory allocation arenas to operate\nfrom. While multithreading can be good for performance, this\npattern and the memory footprint for process launch and\ndependencies can turn the memory footprint for a cirros image\nconversion (16MB) into 1.2GB of memory being asked for by the\nqemu-img tool.\n\nIn order to limit this impact, as the default number of arenas\nis governed by the number of CPUs times the number 8, it seems\nreasonable to lower this to a more reasonable number which\nalso helps keep our possible memory footprint from being exceeded.\n\nChange-Id: I71a28ec59ec31c691205eb34d9fcab63a2ccb682\nStory: 2008928\nTask: 42528\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/ironic-python-agent/commit/9e4c7052a2fd9aac03858db696bf1ea9487f15e6"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/ironic-python-agent/commit/9e4c7052a2fd9aac03858db696bf1ea9487f15e6"}]},"branch":"refs/heads/master"}},"requirements":[],"submit_records":[{"status":"CLOSED","labels":[{"label":"Verified","status":"OK","applied_by":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"OK","applied_by":{"_account_id":23851,"name":"Riccardo Pittau","email":"elfosardo@gmail.com","username":"elfosardo"}},{"label":"Workflow","status":"OK","applied_by":{"_account_id":23851,"name":"Riccardo Pittau","email":"elfosardo@gmail.com","username":"elfosardo"}},{"label":"Backport-Candidate","status":"MAY","applied_by":{"_account_id":15519,"name":"Iury Gregory Melo Ferreira","display_name":"Iury Gregory","email":"iurygregory@gmail.com","username":"iurygregory"}}]}],"submit_requirements":[{"name":"Verified","status":"SATISFIED","is_legacy":true,"submittability_expression_result":{"expression":"label:Verified\u003dCustom-Rule","fulfilled":true,"status":"PASS","passing_atoms":["label:Verified\u003dCustom-Rule"],"failing_atoms":[],"atom_explanations":{}}},{"name":"Workflow","status":"SATISFIED","is_legacy":true,"submittability_expression_result":{"expression":"label:Workflow\u003dCustom-Rule","fulfilled":true,"status":"PASS","passing_atoms":["label:Workflow\u003dCustom-Rule"],"failing_atoms":[],"atom_explanations":{}}},{"name":"Code-Review","status":"SATISFIED","is_legacy":true,"submittability_expression_result":{"expression":"label:Code-Review\u003dCustom-Rule","fulfilled":true,"status":"PASS","passing_atoms":["label:Code-Review\u003dCustom-Rule"],"failing_atoms":[],"atom_explanations":{}}}]}