{"action":"created","issue":{"url":"https://api.github.com/repos/desihub/desisim/issues/329","repository_url":"https://api.github.com/repos/desihub/desisim","labels_url":"https://api.github.com/repos/desihub/desisim/issues/329/labels{/name}","comments_url":"https://api.github.com/repos/desihub/desisim/issues/329/comments","events_url":"https://api.github.com/repos/desihub/desisim/issues/329/events","html_url":"https://github.com/desihub/desisim/pull/329","id":301250354,"number":329,"title":"implement scatter gather, fix broken cosmics for mpi","user":{"login":"lastephey","id":6232308,"avatar_url":"https://avatars1.githubusercontent.com/u/6232308?v=4","gravatar_id":"","url":"https://api.github.com/users/lastephey","html_url":"https://github.com/lastephey","followers_url":"https://api.github.com/users/lastephey/followers","following_url":"https://api.github.com/users/lastephey/following{/other_user}","gists_url":"https://api.github.com/users/lastephey/gists{/gist_id}","starred_url":"https://api.github.com/users/lastephey/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lastephey/subscriptions","organizations_url":"https://api.github.com/users/lastephey/orgs","repos_url":"https://api.github.com/users/lastephey/repos","events_url":"https://api.github.com/users/lastephey/events{/privacy}","received_events_url":"https://api.github.com/users/lastephey/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":2,"created_at":"2018-03-01T01:53:38Z","updated_at":"2018-03-02T21:54:55Z","closed_at":"2018-03-02T21:07:42Z","author_association":"CONTRIBUTOR","pull_request":{"url":"https://api.github.com/repos/desihub/desisim/pulls/329","html_url":"https://github.com/desihub/desisim/pull/329","diff_url":"https://github.com/desihub/desisim/pull/329.diff","patch_url":"https://github.com/desihub/desisim/pull/329.patch"},"body":""},"comment":{"url":"https://api.github.com/repos/desihub/desisim/issues/comments/370063916","html_url":"https://github.com/desihub/desisim/pull/329#issuecomment-370063916","issue_url":"https://api.github.com/repos/desihub/desisim/issues/329","id":370063916,"user":{"login":"sbailey","id":218471,"avatar_url":"https://avatars3.githubusercontent.com/u/218471?v=4","gravatar_id":"","url":"https://api.github.com/users/sbailey","html_url":"https://github.com/sbailey","followers_url":"https://api.github.com/users/sbailey/followers","following_url":"https://api.github.com/users/sbailey/following{/other_user}","gists_url":"https://api.github.com/users/sbailey/gists{/gist_id}","starred_url":"https://api.github.com/users/sbailey/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sbailey/subscriptions","organizations_url":"https://api.github.com/users/sbailey/orgs","repos_url":"https://api.github.com/users/sbailey/repos","events_url":"https://api.github.com/users/sbailey/events{/privacy}","received_events_url":"https://api.github.com/users/sbailey/received_events","type":"User","site_admin":false},"created_at":"2018-03-02T21:54:55Z","updated_at":"2018-03-02T21:54:55Z","author_association":"CONTRIBUTOR","body":"Post-merge update: @lastephey clarified to me that the previous `pixsim_mpi` code had been incorrectly calling`comm_group.bcast(cosmics, root=0)` only for rank 0.  Moving that to correctly call that for all ranks was the fix for the segfault.  It is still unclear to me why MPI would segfault in that case instead of just hanging waiting for the other ranks, but at least I feel better that this isn't just being lucky with the fix working now."}}
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