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Notice that the launcher process\n    should be present so the resulting number of tacker-server\n    processes is 1+{api_workers}*({api_workers}+1).\n\n2). GreenPool is per the second stage launcher. That means {api_workers}\n    number of workers, each of which is a green thread on a seperate\n    process (spawned by ProcessLauncher), share the same pool. There are\n    no pros of having {api_workers} such groups.\n\nThis patch fixes it.\n\nCloses-Bug: #1923528\nChange-Id: I2bf567a0367659c170af0b618374a51d0f13eece\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/tacker/commit/6b5d1e6de18c771e33e0da9e2be32c831d1eddde"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/tacker/commit/6b5d1e6de18c771e33e0da9e2be32c831d1eddde"}]},"branch":"refs/heads/master"},"c1b2c362f085be5f16bd6567d408892fa0205396":{"kind":"TRIVIAL_REBASE_WITH_MESSAGE_UPDATE","_number":2,"created":"2021-04-23 00:34:14.000000000","uploader":{"_account_id":32395,"name":"Koichiro Den","email":"koichiro.den@gmail.com","username":"kden"},"ref":"refs/changes/99/785999/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/tacker","ref":"refs/changes/99/785999/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/tacker refs/changes/99/785999/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/tacker refs/changes/99/785999/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/tacker refs/changes/99/785999/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/tacker refs/changes/99/785999/2"}}},"commit":{"parents":[{"commit":"c137b0ddfe10bd7b9ace0b94460e091d0d7f5ec6","subject":"Add endpoint information in interfaceInfo","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/tacker/commit/c137b0ddfe10bd7b9ace0b94460e091d0d7f5ec6"}]}],"author":{"name":"Koichiro Den","email":"den@valinux.co.jp","date":"2021-04-13 01:38:10.000000000","tz":540},"committer":{"name":"Koichiro Den","email":"den@valinux.co.jp","date":"2021-04-23 00:33:49.000000000","tz":540},"subject":"Fix two-stage process launcher in tacker-server","message":"Fix two-stage process launcher in tacker-server\n\ntacker-server has got two-stage process launcher since a long time ago.\nWhile it doesn\u0027t matter if {api_workers} is set to one or unset, which\nis the case by default on installation via devstack, it should have\nresulted in an odd situation in other cases as follows:\n\n1). surprisingly the number of workers was not {api_workers} but\n    {api_workers}*{api_workers}. Notice that the launcher processes are\n    also present so the resulting number of tacker-server processes was\n    1+{api_workers}*({api_workers}+1).\n\n    E.g., when {api_workers}\u003d100, the number of tacker-server processes\n    is 10101.\n\n2). GreenPool is per the second stage launcher. That means {api_workers}\n    number of workers, each of which is a green thread on a seperate\n    process (spawned by ProcessLauncher), share the same pool. It means\n    that the second stage launcher does not only fail to provide\n    performance scaling, but also more likely to unnecessarily keep some\n    workers starved due to a process which starts sleeping before\n    yielding.\n\nThis patch fixes it so that there is just a one-stage launcher.\n\n    [Before this patch]\n        master\n          ├── worker#0 # second-stage launcher\n          │   ├── worker#0-0 (*1)\n          │   ├── worker#0-1 (*1)\n          │   :\n          │   └── worker#0-{api_workers-1} (*1)\n          ├── worker#1 # second-stage launcher\n          :\n          └── worker#{api_workers-1}\n              :\n              └── worker#{api_workers-1}-{api_workers-1} (*1)\n\n    [After this patch]\n        master\n          ├── worker#0 (*1)\n          ├── worker#1 (*1)\n          :\n          └── worker#{api_workers-1} (*1)\n\n    (*1) spawns one green thread at the start.\n\nCloses-Bug: #1923528\nChange-Id: I2bf567a0367659c170af0b618374a51d0f13eece\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/tacker/commit/c1b2c362f085be5f16bd6567d408892fa0205396"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/tacker/commit/c1b2c362f085be5f16bd6567d408892fa0205396"}]},"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":26222,"name":"Cong Phuoc Hoang","email":"hoangphuocbk2.07@gmail.com","username":"hoangphuoc"}},{"label":"Workflow","status":"OK","applied_by":{"_account_id":26222,"name":"Cong Phuoc Hoang","email":"hoangphuocbk2.07@gmail.com","username":"hoangphuoc"}}]}],"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":{}}}]}