{"action":"created","comment":{"url":"https://api.github.com/repos/ManageIQ/manageiq/pulls/comments/50047969","id":50047969,"diff_hunk":"@@ -1,5 +1,5 @@\n-require \"workers/evm_server\"\n-if MiqEnvironment::Process.is_rails_runner?\n+if defined?(Vmdb::Application) && Vmdb::Application.initialized?\n+  require 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MiqEnvironment::Process call with what we really want, if you ran this with ruby by accident, the Vmdb::Application wouldn't be loaded or initialized.","created_at":"2016-01-18T21:52:33Z","updated_at":"2016-01-18T21:52:33Z","html_url":"https://github.com/ManageIQ/manageiq/pull/3593#discussion_r50047969","pull_request_url":"https://api.github.com/repos/ManageIQ/manageiq/pulls/3593","_links":{"self":{"href":"https://api.github.com/repos/ManageIQ/manageiq/pulls/comments/50047969"},"html":{"href":"https://github.com/ManageIQ/manageiq/pull/3593#discussion_r50047969"},"pull_request":{"href":"https://api.github.com/repos/ManageIQ/manageiq/pulls/3593"}}},"pull_request":{"url":"https://api.github.com/repos/ManageIQ/manageiq/pulls/3593","id":40811803,"html_url":"https://github.com/ManageIQ/manageiq/pull/3593","diff_url":"https://github.com/ManageIQ/manageiq/pull/3593.diff","patch_url":"https://github.com/ManageIQ/manageiq/pull/3593.patch","issue_url":"https://api.github.com/repos/ManageIQ/manageiq/issues/3593","number":3593,"state":"open","locked":false,"title":"[WIP] Use fork instead of spawn to create worker processes for memory/speed savings","user":{"login":"jrafanie","id":19339,"avatar_url":"https://avatars.githubusercontent.com/u/19339?v=3","gravatar_id":"","url":"https://api.github.com/users/jrafanie","html_url":"https://github.com/jrafanie","followers_url":"https://api.github.com/users/jrafanie/followers","following_url":"https://api.github.com/users/jrafanie/following{/other_user}","gists_url":"https://api.github.com/users/jrafanie/gists{/gist_id}","starred_url":"https://api.github.com/users/jrafanie/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jrafanie/subscriptions","organizations_url":"https://api.github.com/users/jrafanie/orgs","repos_url":"https://api.github.com/users/jrafanie/repos","events_url":"https://api.github.com/users/jrafanie/events{/privacy}","received_events_url":"https://api.github.com/users/jrafanie/received_events","type":"User","site_admin":false},"body":"Replaces #1070 \r\n\r\nUsing Kernel.fork instead of Kernel.spawn when the main server process creates child processes allows us to take advantage of copy on write friendly ruby 2.0+ to share memory (in the future) and much faster worker creation since many of the files are already required and loaded in memory.\r\n\r\nMiqServer#start is now **3 times faster: 45 -> 15 seconds**\r\n\r\nTODO list done outside of this PR:\r\n- [x] Add [Proportional set size](https://github.com/ManageIQ/manageiq/pull/6112) for measuring forked process memory usage more accurately \r\n- [ ] In [MiqServer#sync_workers, separate the calculation of workers needed per worker class from the actual starting/stopping of said workers](https://github.com/ManageIQ/manageiq/pull/6160)\r\n\r\nTODO list:\r\n- [x] Change base workers to fork instead of spawn\r\n- [x] Change UI/Web Service workers to run Rails::Server after they fork\r\n- [x] Add pre_fork hook to contain the future logic for preloading gems, files, etc. (actual preloading to occur in a followup PR\r\n- [x] Add after_fork hook to stop the server's DRb::Service in all forked children\r\n- [x] Change the worker setproctitle to a common worker prefix to make it easier to detect them in ps, top, and MiqProcess\r\n- [x] Remove now unused `command_line` column and `build_command_line` related methods\r\n- [x] Close raw pg sockets inherited in the forked child process\r\n- [x] Change memory threshold tests to use PSS (on linux) instead of RSS to determine if a worker has exceeded it's limits.\r\n- [x] Fix `MiqEnvironment::Process.is_x?` methods to work with forked worker processes that don't go through initialization code like before - REMOVED CALLERS AND DELETED :scissors: \r\n- [x] Fix not set secret_token `Vmdb::Application.config.secret_token = MiqDatabase.first.session_secret_token` because we call this too late now\r\n\r\nThis pull request only forks and does not attempt to decrease memory usage by preloading code before we fork.  Therefore, we might actually use more memory with this PR.\r\n\r\n\r\n","created_at":"2015-07-24T20:19:36Z","updated_at":"2016-01-18T21:52:33Z","closed_at":null,"merged_at":null,"merge_commit_sha":"3713672e2cc3e2f865ae2b0a0a3da7935f24acb4","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/ManageIQ/manageiq/pulls/3593/commits","review_comments_url":"https://api.github.com/repos/ManageIQ/manageiq/pulls/3593/comments","review_comment_url":"https://api.github.com/repos/ManageIQ/manageiq/pulls/comments{/number}","comments_url":"https://api.github.com/repos/ManageIQ/manageiq/issues/3593/comments","statuses_url":"https://api.github.com/repos/ManageIQ/manageiq/statuses/065539dc5f58d70a62b0c8f1f5a8d04af13ed001","head":{"label":"jrafanie:forking_workers","ref":"forking_workers","sha":"065539dc5f58d70a62b0c8f1f5a8d04af13ed001","user":{"login":"jrafanie","id":19339,"avatar_url":"https://avatars.githubusercontent.com/u/19339?v=3","gravatar_id":"","url":"https://api.github.com/users/jrafanie","html_url":"https://github.com/jrafanie","followers_url":"https://api.github.com/users/jrafanie/followers","following_url":"https://api.github.com/users/jrafanie/following{/other_user}","gists_url":"https://api.github.com/users/jrafanie/gists{/gist_id}","starred_url":"https://api.github.com/users/jrafanie/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jrafanie/subscriptions","organizations_url":"https://api.github.com/users/jrafanie/orgs","repos_url":"https://api.github.com/users/jrafanie/repos","events_url":"https://api.github.com/users/jrafanie/events{/privacy}","received_events_url":"https://api.github.com/users/jrafanie/received_events","type":"User","site_admin":false},"repo":{"id":20803842,"name":"manageiq","full_name":"jrafanie/manageiq","owner":{"login":"jrafanie","id":19339,"avatar_url":"https://avatars.githubusercontent.com/u/19339?v=3","gravatar_id":"","url":"https://api.github.com/users/jrafanie","html_url":"https://github.com/jrafanie","followers_url":"https://api.github.com/users/jrafanie/followers","following_url":"https://api.github.com/users/jrafanie/following{/other_user}","gists_url":"https://api.github.com/users/jrafanie/gists{/gist_id}","starred_url":"https://api.github.com/users/jrafanie/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jrafanie/subscriptions","organizations_url":"https://api.github.com/users/jrafanie/orgs","repos_url":"https://api.github.com/users/jrafanie/repos","events_url":"https://api.github.com/users/jrafanie/events{/privacy}","received_events_url":"https://api.github.com/users/jrafanie/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/jrafanie/manageiq","description":"ManageIQ 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