Oleg Broytmann wrote:
> On Wed, Jul 22, 2009 at 05:18:46PM -0400, Stef Telford wrote:
>
>>>> Ordered by: cumulative time
>>>>
>>>> ncalls tottime percall cumtime percall filename:lineno(function)
>>>> 1 0.127 0.127 83.346 83.346 sresults.py:175(__iter__)
>>>> 40001 0.308 0.000 79.876 0.002 dbconnection.py:649(next)
>>>>
>>> Hmm. Does the program try to draw the entire table in one huge slurp?
>>>
>>>
>> Actually, no. This page does 40k of bookings (a single object type) but
>> the query isn't "Sequential" (it's not grabbing 0-40,000 is what I
>> mean).
>>
>
> Hmm. One call to SelectResults.__iter__ that spans the entire program's
> lifetime. "One huge SELECT" is the only way I can interpret this.
>
>
Hello Oleg,
Sorry, I should have been more precise in my statement. The bookings
-are- returned from one select/query via cursor but the bookings are not
contiguous (eg, booking 300, booking 310, booking 423, etc). This said,
I tried the select in psql and it worked in 19msec and then I tried from
psycopg2 cursor and it took 3 seconds.. so.. I have to ask, why is it
taking 23sec ?
> So we have 29 seconds in Decimal.__new__, 10 seconds in fetchone, and 23
> seconds in _SO_selectInit. 63 seconds of 85...
>
>
yup, and the next two are the notify method (which is similiar in way to
publish/subscribers that I have added into sqlobject) and framestack
(which is used in the notify method to stop circular references). I
could rip those out but.. :\
>>>> 40000 0.214 0.000 23.323 0.001 main.py:912(_init)
>>>> 40000 10.475 0.000 23.069 0.001 main.py:1140(_SO_selectInit)
>>>>
>>> _SO_selectInit is a rather simple function - it populates the row with
>>> values just fetched from the DB; the values are converted using calls to
>>> to_python. Those to_python calls are fast (if we ca believe the profiler) -
>>> see above. So where does _SO_selectInit spend its time?!
>>>
>
> Well, it is certainly not evals. I also doubt it has something with
> garbage collection. Not in this function.
>
>
hrm. could it be tied to the Decimal init's ? I mean to say, if we are
seeing that those take a while to create, and each object has 10-14
Decimals inside it.. hrm
Regards
Stef
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