This is what an insert request looks like now: 10659ms 44687cpu_ms
40040api_cpu_ms for about 4000 entities in the model. I would say its
increases by 10 seconds per 1000 entities.
On Jan 21, 12:01 am, "Ikai L (Google)" <ika...@google.com> wrote:
> How much does the CPU time increase by?
>
>
>
>
>
> On Wed, Jan 20, 2010 at 1:59 PM, Lucian Baciu <lucianba...@gmail.com> wrote:
> > In total my model has about 4000 entities. The shape of my model is
> > like this: a root entity that has many owned one to many
> > relationships
> > (about 10), and each children collection can have hundreds or
> > thousands of child entities in them, something like:
>
> > public class Account{
> > @Persistent(mappedBy = "account")
> > �...@order(extensions = @Extension(vendorName="datanucleus",
> > key="list-
> > ordering", value="key asc"))
> > private List<Child1> children1;
> > @Persistent(mappedBy = "account")
> > �...@order(extensions = @Extension(vendorName="datanucleus",
> > key="list-
> > ordering", value="key asc"))
> > private List<Child2> children2;
> > //....
> > @Persistent(mappedBy = "account")
> > �...@order(extensions = @Extension(vendorName="datanucleus",
> > key="list-
> > ordering", value="key asc"))
> > private List<Child10> children10;
> > }
>
> > Yes my inserts are in transaction. I've marked all entity properties
> > not used in custom indexes as unindexed, but I still see the same
> > problem. The CPU time continues to increase for the same insert
> > operation of one entity as the group gets larger. Also, I have no
> > custom indexes with two list properties, so I don't think I have an
> > exploding index problem.
>
> > On Jan 20, 11:45 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> > > How many child entities does a model have? Is it in a transaction? Index
> > > updates are synchronous, though a simple update to the index should not
> > > dramatically increase the insert time.
>
> > > In addition to reducing the indexed properties, you may also want to look
> > at
> > > inserting entities asynchronously via the Task Queue. It won't reduce the
> > > insert time, but it will reduce the amount of time your application
> > spends
> > > serving a response to a user.
>
> > > On Mon, Jan 18, 2010 at 11:30 AM, Lucian Baciu <lucianba...@gmail.com
> > >wrote:
>
> > > > That's a great video, but I don't think it can help me. I think my
> > > > model is right, it is basically 1 to many owned relationship and as
> > > > the number of child entities grows so does the insert operations time.
> > > > I can't figure out why! Any idea why???
>
> > > > Thanks,
> > > > Lucian
>
> > > > On Jan 15, 8:55 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> > > > > Brett Slakin on the App Engine team gave a great talk about a problem
> > > > > similar to what you are describing at last year's Google I/O and how
> > to
> > > > > solve it. You may want to check this video out:
>
> >http://code.google.com/events/io/2009/sessions/BuildingScalableComple...
>
> > > > > <
> >http://code.google.com/events/io/2009/sessions/BuildingScalableComple..
> > > > .>How
> > > > > are your models current set up?
>
> > > > > On Fri, Jan 15, 2010 at 1:10 AM, Lucian Baciu <lucianba...@gmail.com
>
> > > > wrote:
> > > > > > I have a root User entity and a child Note entity. Each User can
> > have
> > > > > > many Note entities. The Note entity has four indices.
>
> > > > > > I've noticed that as the number of Note entities for a User
> > increases
> > > > > > so does the request time/latency and CPU used on Note insert
> > > > > > operations. When the number on Note entities for a user is about
> > 1000,
> > > > > > an insert Note request takes about 10 seconds in request time and
> > > > > > about 40 seconds of CPU, which is very high and as it continues to
> > > > > > increase it makes my app unusable.
>
> > > > > > Is there something I can do to optimize this, or is this an app
> > engine
> > > > > > issue?
>
> > > > > > Thanks,
> > > > > > Lucian
>
> > > > > > --
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> > > > > --
> > > > > Ikai Lan
> > > > > Developer Programs Engineer, Google App Engine
>
> > > > --
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> > > --
> > > Ikai Lan
> > > Developer Programs Engineer, Google App Engine
>
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> --
> Ikai Lan
> Developer Programs Engineer, Google App Engine
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