Use lots of memcache.
On May 29, 7:51 am, Shedokan <shedok...@gmail.com> wrote:
> Thanks, I am worried because I am trying to optimize my app to be
> almost as fast as the php version.
>
> usualy it takes 250ms for an ajax request(firebug) in the php version
> and 500ms in the python version so python is two times slower than the
> php version.
> but I guess it's because I have to store the files in the datastore
> and not in real directories.
>
> well thanks anyway.
>
> On 29 מאי, 04:32, David Wilson <d...@botanicus.net> wrote:
>
> > Just assume that any string/list/hash/integer-related operations in
> > Python are likely faster than you'll ever need them to be. The
> > overhead for buffering the response is going to be tiny regardless of
> > your application, since at most you're only talking about handling
> > strings of up to 10mb (which is the request size limit).
>
> > If there is anything with AppEngine you need to be careful of, it is
> > use of Datastore, where reading/writing large numbers of entities will
> > cost a lot of performance. Reducing your Datastore use by a single
> > db.get() is equal to thousands of calls to self.response.out.write()
>
> > $ python /usr/lib/python2.5/timeit.py -v -s 'from cStringIO import
> > StringIO; out = StringIO()' 'out.write("123")'
> > 10000 loops -> 0.00373 secs
> > 100000 loops -> 0.0383 secs
> > 1000000 loops -> 0.365 secs
> > raw times: 0.358 0.358 0.357
> > 1000000 loops, best of 3: 0.357 usec per loop
>
> > $ ae
> > Python 2.5.1 (r251:54863, Feb 6 2009, 19:02:12)
> > [GCC 4.0.1 (Apple Inc. build 5465)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
> > (AppEngineShell)>>> import time
> > >>> t1 = time.time() ; db.get(db.Key.from_path('Foo', 1234)) ; print
> > >>> (time.time()-t1)*1000
>
> > 12.0000839233
>
> > David.
>
> > 2009/5/29 Shedokan <shedok...@gmail.com>:
>
> > > Thanks, but does self.response.out affects speed very much?
> > > I couldn't benchmark it, strange...
>
> > > On 28 מאי, 22:25, David Wilson <d...@botanicus.net> wrote:
> > >> Using self.response.out will also delay sending your entire response
> > >> until it is sure to succeed.
>
> > >> If you start generating output using 'print', and then e.g. a
> > >> Datastore request times out, or a bug in your code is triggered, you
> > >> have no chance to display a friendly error message. Instead the user
> > >> will get a half-rendered page with a stack trace embedded in it, or
> > >> worse.
>
> > >> David.
>
> > >> 2009/5/28 Shedokan <shedok...@gmail.com>:
>
> > >> > so I can't print binary data like Images?
>
> > >> > On 28 מאי, 21:03, 风笑雪 <kea...@gmail.com> wrote:
> > >> >> Print is also OK, but you need handle header by yourself, and it can
> > >> >> only
> > >> >> output
> > >> >> text.http://code.google.com/intl/en/appengine/docs/python/gettingstarted/h...
>
> > >> >> print 'Content-Type: text/plain'
> > >> >> print ''
> > >> >> print 'Hello, world!'
>
> > >> >> 2009/5/29 Shedokan <shedok...@gmail.com>
>
> > >> >> > I am wondering why should I use self.response.out.write and not
> > >> >> > print
> > >> >> > everything.
>
> > >> >> > because I am making this app where I have to output from a lot
> > >> >> > ofdifferent functions and I am passing the object 'self' everywhere.
>
> > >> >> > thanks.
>
> > >> --
> > >> It is better to be wrong than to be vague.
> > >> — Freeman Dyson
>
> > --
> > It is better to be wrong than to be vague.
> > — Freeman Dyson
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