Yeah, it was just an example On Feb 2, 4:28 am, Daniel Roseman <dan...@roseman.org.uk> wrote: > On Tuesday, February 1, 2011 11:52:49 PM UTC, oyiptong wrote: > > > Hello, > > > I have been seeing a big performance degradation with my application > > in production. > > The traffic is roughly 2.5K pageviews per day. I can expect each page > > to load 100 model objects in memory. > > > Some might overlap, but I have a large inventory of objects to show. > > > I have noticed that pages have been taking longer and longer to load, > > at a point where its unacceptable. > > Looking at the wsgi processes, i found that they a request seems to be > > taking up a large amount of CPU usage. > > > I've been poking around to see how I could improve things, and I've > > noticed this behavior: > > > from project.app.models import Model > > m = Model.objects.all()[200:300] > > len(list(m)) > > > This takes several seconds. > > > from project.app.models import Model > > m = Model.objects.all()[400:500] > > len(list(m.values())) > > > This is much faster. If you're gonna try it, make sure you choose a > > range of objects that are not already in memory. > > > Is the only difference between the two object allocation? > > If object allocation is what is costing me so much CPU power, how can > > I get around it? > > Is using the values method the only option? > > Is `len` just an example? If that's really all you need, you should be using > m.count() instead. > -- > DR.
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