{"action":"created","issue":{"url":"https://api.github.com/repos/blaze/dask/issues/863","labels_url":"https://api.github.com/repos/blaze/dask/issues/863/labels{/name}","comments_url":"https://api.github.com/repos/blaze/dask/issues/863/comments","events_url":"https://api.github.com/repos/blaze/dask/issues/863/events","html_url":"https://github.com/blaze/dask/issues/863","id":120568140,"number":863,"title":"converting strings to timestamps","user":{"login":"fjanoos","id":923438,"avatar_url":"https://avatars.githubusercontent.com/u/923438?v=3","gravatar_id":"","url":"https://api.github.com/users/fjanoos","html_url":"https://github.com/fjanoos","followers_url":"https://api.github.com/users/fjanoos/followers","following_url":"https://api.github.com/users/fjanoos/following{/other_user}","gists_url":"https://api.github.com/users/fjanoos/gists{/gist_id}","starred_url":"https://api.github.com/users/fjanoos/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fjanoos/subscriptions","organizations_url":"https://api.github.com/users/fjanoos/orgs","repos_url":"https://api.github.com/users/fjanoos/repos","events_url":"https://api.github.com/users/fjanoos/events{/privacy}","received_events_url":"https://api.github.com/users/fjanoos/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2015-12-05T16:05:53Z","updated_at":"2015-12-05T16:21:16Z","closed_at":null,"body":"Hi, \r\nI have a dask dataframe with a 'time' column that in string format. I'm trying to convert it to a pandas Timestamp type as follows:\r\n```\r\nfrom pandas.tseries.tools import to_datetime\r\nmy_ddf['time'].map_partitions(to_datetime, columns='time').compute()\r\n```\r\nThis conversion takes forever to run (>1min) . Running to_datetime on a pandas dataframe version of the data finishes in about 10 secs. Any suggestions about what's going on and how I can speed it up?"},"comment":{"url":"https://api.github.com/repos/blaze/dask/issues/comments/162217967","html_url":"https://github.com/blaze/dask/issues/863#issuecomment-162217967","issue_url":"https://api.github.com/repos/blaze/dask/issues/863","id":162217967,"user":{"login":"mrocklin","id":306380,"avatar_url":"https://avatars.githubusercontent.com/u/306380?v=3","gravatar_id":"","url":"https://api.github.com/users/mrocklin","html_url":"https://github.com/mrocklin","followers_url":"https://api.github.com/users/mrocklin/followers","following_url":"https://api.github.com/users/mrocklin/following{/other_user}","gists_url":"https://api.github.com/users/mrocklin/gists{/gist_id}","starred_url":"https://api.github.com/users/mrocklin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mrocklin/subscriptions","organizations_url":"https://api.github.com/users/mrocklin/orgs","repos_url":"https://api.github.com/users/mrocklin/repos","events_url":"https://api.github.com/users/mrocklin/events{/privacy}","received_events_url":"https://api.github.com/users/mrocklin/received_events","type":"User","site_admin":false},"created_at":"2015-12-05T16:21:16Z","updated_at":"2015-12-05T16:21:16Z","body":"You seem to be doing the correct thing as far as I can see.  Perhaps try out the `Profiler` to see what is taking up the most time?\r\n\r\nhttp://dask.pydata.org/en/latest/diagnostics.html#profiler"}}