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Do you have any numbers to share so far?\n\nI was wondering, is this something that tooz could help with? https://docs.openstack.org/tooz/latest/user/tutorial/lock.html -- right now this requires the user deploy etcd; with tooz I think it opens up several other options for how to do the locking. 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This gets worse when\nyou limit the number of concurrent ssh connections.\n\nHere we look to batch up commands to send to the switch together using a\nsingle connection. The results of each port\u0027s commands are returned when\navailable.\n\nThis is implemented using etcd as a queueing system. Commands are added\nto an input key, then a worker thread processes the available commands\nfor a particular switch device. We pull off the queue using the version\nat which the keys were added, giving a FIFO style queue. The result of\neach command set are added to an output key, which the original request\nthread is watching. Distributed locks are used to serialise the\nprocessing of commands for each switch device.\n\nVarious neat etcd features are used here to alleviate some of the issues\nof distributed task coordination, including transactions, leases,\nwatches, historical key/value tracking, etc.\n\nCo-Authored-By: Mark Goddard \u003cmark@stackhpc.com\u003e\n\nChange-Id: I8c458bbc94df5630cfede5434bcdbe527988059c\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/a915d2b39273c8c65eee4346d6ac4552ef170fd6"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/a915d2b39273c8c65eee4346d6ac4552ef170fd6"}]},"branch":"refs/heads/master"},"ab4d37c2fa6ccd04beee276a02731d35046bfdca":{"kind":"REWORK","_number":9,"created":"2023-02-23 12:36:50.000000000","uploader":{"_account_id":14826,"name":"Mark Goddard","email":"markgoddard86@gmail.com","username":"mgoddard"},"ref":"refs/changes/83/743283/9","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/networking-generic-switch","ref":"refs/changes/83/743283/9","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/9 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/9 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/9 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/9"}}},"commit":{"parents":[{"commit":"0c7f61bb39ded112d62f51894876398f86a5425a","subject":"Add ngs_ssh_disabled_algorithms setting","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/0c7f61bb39ded112d62f51894876398f86a5425a"}]}],"author":{"name":"John Garbutt","email":"john@johngarbutt.com","date":"2020-07-27 16:59:10.000000000","tz":60},"committer":{"name":"Mark Goddard","email":"mark@stackhpc.com","date":"2023-02-23 12:35:52.000000000","tz":0},"subject":"Support batching up commands","message":"Support batching up commands\n\nWhen you have around 60 baremetal nodes attached to a single switch, it\ntakes a long time to execute all those commands. This gets worse when\nyou limit the number of concurrent ssh connections.\n\nHere we look to batch up commands to send to the switch together using a\nsingle connection. The results of each port\u0027s commands are returned when\navailable.\n\nThis is implemented using etcd as a queueing system. Commands are added\nto an input key, then a worker thread processes the available commands\nfor a particular switch device. We pull off the queue using the version\nat which the keys were added, giving a FIFO style queue. The result of\neach command set are added to an output key, which the original request\nthread is watching. Distributed locks are used to serialise the\nprocessing of commands for each switch device.\n\nVarious neat etcd features are used here to alleviate some of the issues\nof distributed task coordination, including transactions, leases,\nwatches, historical key/value tracking, etc.\n\nCo-Authored-By: Mark Goddard \u003cmark@stackhpc.com\u003e\n\nChange-Id: I8c458bbc94df5630cfede5434bcdbe527988059c\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/ab4d37c2fa6ccd04beee276a02731d35046bfdca"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/ab4d37c2fa6ccd04beee276a02731d35046bfdca"}]},"branch":"refs/heads/master"},"494f69811e406c0247d22b169733e1b67cbafb2b":{"kind":"REWORK","_number":10,"created":"2023-02-23 12:44:44.000000000","uploader":{"_account_id":14826,"name":"Mark Goddard","email":"markgoddard86@gmail.com","username":"mgoddard"},"ref":"refs/changes/83/743283/10","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/networking-generic-switch","ref":"refs/changes/83/743283/10","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/10 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/10 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/10 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/10"}}},"commit":{"parents":[{"commit":"0c7f61bb39ded112d62f51894876398f86a5425a","subject":"Add ngs_ssh_disabled_algorithms setting","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/0c7f61bb39ded112d62f51894876398f86a5425a"}]}],"author":{"name":"John Garbutt","email":"john@johngarbutt.com","date":"2020-07-27 16:59:10.000000000","tz":60},"committer":{"name":"Mark Goddard","email":"mark@stackhpc.com","date":"2023-02-23 12:44:38.000000000","tz":0},"subject":"Support batching up commands","message":"Support batching up commands\n\nWhen you have around 60 baremetal nodes attached to a single switch, it\ntakes a long time to execute all those commands. This gets worse when\nyou limit the number of concurrent ssh connections.\n\nHere we look to batch up commands to send to the switch together using a\nsingle connection. The results of each port\u0027s commands are returned when\navailable.\n\nThis is implemented using etcd as a queueing system. Commands are added\nto an input key, then a worker thread processes the available commands\nfor a particular switch device. We pull off the queue using the version\nat which the keys were added, giving a FIFO style queue. The result of\neach command set are added to an output key, which the original request\nthread is watching. Distributed locks are used to serialise the\nprocessing of commands for each switch device.\n\nVarious neat etcd features are used here to alleviate some of the issues\nof distributed task coordination, including transactions, leases,\nwatches, historical key/value tracking, etc.\n\nCo-Authored-By: Mark Goddard \u003cmark@stackhpc.com\u003e\n\nChange-Id: I8c458bbc94df5630cfede5434bcdbe527988059c\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/494f69811e406c0247d22b169733e1b67cbafb2b"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/494f69811e406c0247d22b169733e1b67cbafb2b"}]},"branch":"refs/heads/master"},"45b237b754cd2d9c6f9c588e759fa74da5b9eacc":{"kind":"REWORK","_number":11,"created":"2023-02-27 15:51:43.000000000","uploader":{"_account_id":14826,"name":"Mark Goddard","email":"markgoddard86@gmail.com","username":"mgoddard"},"ref":"refs/changes/83/743283/11","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/networking-generic-switch","ref":"refs/changes/83/743283/11","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/11 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/11 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/11 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/networking-generic-switch refs/changes/83/743283/11"}}},"commit":{"parents":[{"commit":"0c7f61bb39ded112d62f51894876398f86a5425a","subject":"Add ngs_ssh_disabled_algorithms setting","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/networking-generic-switch/commit/0c7f61bb39ded112d62f51894876398f86a5425a"}]}],"author":{"name":"John Garbutt","email":"john@johngarbutt.com","date":"2020-07-27 16:59:10.000000000","tz":60},"committer":{"name":"Mark Goddard","email":"mark@stackhpc.com","date":"2023-02-27 15:51:43.000000000","tz":0},"subject":"Support batching up commands","message":"Support batching up commands\n\nWhen you have around 60 baremetal nodes attached to a single switch, it\ntakes a long time to execute all those commands. 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