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08:19:50.000000000","tz":120},"committer":{"name":"Luigi Toscano","email":"ltoscano@redhat.com","date":"2022-06-30 13:00:29.000000000","tz":120},"subject":"Reduce memory consumption in Cinder services","message":"Reduce memory consumption in Cinder services\n\nThis patch reduces memory usage on the Cinder Volume and Backup services\nby tuning glibc.\n\nThe specific tuning consist on disabling the per thread arenas and\ndisabling dynamic thresholds.\n\nThe Cinder Backup service suffers from high water mark memory usage and\nuses excessive memory.  As an example just after 10 restore operations\nthe service uses almost 1GB of RAM and does not ever free it afterwards.\nWith this patch the memory consumption of the service is reduced down to\nalmost 130MB.  If we add a revert from Cinder (Change-Id\nI43a20c8687f12bc52b014611cc6977c4c3ca212c) it goes down to 100MB during\nmy tests.\n\nThis glibc tuning is not applied to all Python services because I\nhaven\u0027t done proper testings on them and at first glance they don\u0027t seem\nto have such great improvements.\n\nRelated-bug: #1908805\nChange-Id: Ic9030d01468b3189350f83b04a8d1d346c489d3c\n(cherry picked from commit d5af514ac9485009229f3b594bccc09e905782fb)\n(cherry picked from commit eb16f28ab2ee5ab8642bb404e1d0bcec75399f32)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/devstack/commit/0d22380971aa2d2e8ff4ab6d93908f5b53ef0134"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/devstack/commit/0d22380971aa2d2e8ff4ab6d93908f5b53ef0134"}]},"branch":"refs/heads/stable/xena"}},"requirements":[],"submit_records":[{"rule_name":"gerrit~DefaultSubmitRule","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":22873,"name":"Martin Kopec","email":"mkopec@redhat.com","username":"mkopec"}},{"label":"Workflow","status":"OK","applied_by":{"_account_id":22873,"name":"Martin Kopec","email":"mkopec@redhat.com","username":"mkopec"}},{"label":"Review-Priority","status":"MAY"}]}],"submit_requirements":[]}