[IPython-User] slow startup time possibly because of sqlite

klo uo klonuo@gmail....
Tue Jan 29 01:21:19 CST 2013

Do you think it would be useful, to allow option to write current session
to memory as in Matthias example, and:

 - allow dumping history from memory to file by appending, on exit
 - allow IPython function to load stored history file, on demand

On Mon, Jan 28, 2013 at 11:32 PM, Thomas Kluyver <takowl@gmail.com> wrote:

> On 28 January 2013 19:33, Matthias BUSSONNIER <
> bussonniermatthias@gmail.com> wrote:
>> IIRC we had some issues with history on NFS, but maybe it was only on
>> windows.
> It's not, unfortunately - SQLite over NFS is a general problem. And as far
> as we know, there's no way to easily detect whether a directory is on NFS.
> The workaround is to set HistoryManager.hist_file to a location that will
> be stored locally, or to :memory: (in which case, history will be lost
> between sessions).
> Thanks for the detailed analysis of the problem. From what you say,
> connecting from different threads may be the issue. We have a
> HistorySavingThread which opens its own connection to the database to write
> command history. Python's sqlite3 module has an undocumented option to
> share a single database connection between threads. We've been reluctant to
> play with it, but you might want to experiment with it.
> Best wishes,
> Thomas
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