zeitgeist team mailing list archive

[Seif Lotfy <639737@xxxxxxxxxxxxxxxxxx>]

After reading through again and again I think we should go with:

* locking_mode = EXCLUSIVE    ==> look at mikkels explanation 
* synchronous = NORMAL   ==> again this seems very reasonable since according to the sqlite guys the chances are near 0 that something wrong could happen there.
* journal_mode = WAL ==>  please read http://www.sqlite.org/wal.html it shows the advantages and disadvantages where I think we are not really targeted by the disadvantages.

-- 
Improve insertion times
https://bugs.launchpad.net/bugs/639737
You received this bug notification because you are a member of Zeitgeist
Framework Team, which is subscribed to Zeitgeist Framework.

Status in Zeitgeist Framework: Triaged

Bug description:
We insert pretty slowly with an average of 0.15 seconds for one event on my core i5 2.5 GHz beast.

RainCT had some optimization possibilities:
1) PRAGMA synchronous=OFF
2) PRAGMA journal_mode=OFF

The Chat:
------------------------------------------------------------
<kamstrup> I think we are - but I can't recall... in case of failed transactions - but I don't even know if we use transactions these days...
<seif> <RainCT> try synchronous=OFF
<seif> <RainCT> but it can corrupt your database if your phone dies while ZG is inserting
<seif> <RainCT> and journal_mode=MEMORY
<seif> <RainCT> or OFF since we don't use rollback anyway
<seif> so maybe journal_mode = OFF is a good start?
<kamstrup> okay, he's probably right...
<kamstrup> 'grep -Ri rollback _zeitgeist/' is your friend :-)
<kamstrup> apparently we are not using rollback...

More info can be found here: http://www.sqlite.org/pragma.html
------------------------------------------------------------

In order to get a better picture of what's going on, can you please try to get some more information, like:
1) How many events are in your database?
2) What's the insertion time for one event into an empty db?
3) Out of this 0.15 secs, how many time is spend in our python code, and what's the time of the actual sql action?
4) How much faster is adding 10 events at once compared to adding them one at a time?
5) You think 0.15 secs is slow for inserting one event, what time do you expect, and why?