thanks marzia, thats what I needed to hear.
On Feb 26, 12:33 pm, Marzia Niccolai <ma...@google.com> wrote:
> Hi,
>
> To clarify, this is based on runtime CPU, not datastore CPU. Also, this
> shouldn't affect the serving status of your application, it just means that
> your app may see some additional latency on a per request basis if it is
> serving a large number of CPU intensive requests.
>
> -Marzia
>
>
>
> On Tue, Feb 24, 2009 at 3:41 PM, bFlood <bflood...@gmail.com> wrote:
>
> > hi marzia
>
> > ok, can you confirm these new limits? previously, most people designed
> > their apps to run in the 100-300ms range (datastore access included).
> > when you started to go over 300ms, the warnings would start to show up
> > in the logs. suffice it to say, it was reasonable to assume when no
> > warnings showed up you were in the range that would scale very well on
> > GAE.
>
> > are you now saying that the new average request target should be below
> > 100ms (datastore access included)? if so, this seems to me like a
> > significant reduction in GAE functionality/flexibility.
>
> > am I reading this wrong? (entirely possible)
>
> > thx
> > brian
>
> > On Feb 24, 4:55 pm, bFlood <bflood...@gmail.com> wrote:
> > > well that seems like a change from previous posts. I thought people
> > > generally quoted 200-300ms as a safe place to be for most of your
> > > requests
>
> > > On Feb 24, 4:13 pm, Marzia Niccolai <ma...@google.com> wrote:
>
> > > > Hi,
>
> > > > 20ms is not considered CPU intensive, but once you get up in to the
> > > > hundreds, it is.
>
> > > > -Marzia
>
> > > > On Tue, Feb 24, 2009 at 5:43 AM, bFlood <bflood...@gmail.com> wrote:
>
> > > > > thanks marzia
>
> > > > > I dont want to read too much into Nick's results above but is
> > 30-200ms
> > > > > now considered to be CPU intensive?
>
> > > > > cheers
> > > > > brian
>
> > > > > On Feb 23, 4:20 pm, Marzia Niccolai <ma...@google.com> wrote:
> > > > > > Hi,
>
> > > > > > This is done on a per-request basis.
>
> > > > > > -Marzia
>
> > > > > > On Mon, Feb 23, 2009 at 12:14 PM, bFlood <bflood...@gmail.com>
> > wrote:
>
> > > > > > > hi marzia
>
> > > > > > > when this occurs, is the temp governor set for the entire app? or
> > just
> > > > > > > the handler that caused the high CPU warning? above, Nick said
> > that
> > > > > > > the typical request was 30-200ms so it seems odd that it would be
> > > > > > > throttled
>
> > > > > > > I think this is better then the original high CPU reaction (throw
> > > > > > > exception after limit) but if it affects *all* handlers it might
> > turn
> > > > > > > out to be far worse for apps where the majority of requests are
> > well
> > > > > > > below the high CPU threadhold
>
> > > > > > > cheers
> > > > > > > brian
>
> > > > > > > On Feb 23, 2:54 pm, Marzia Niccolai <ma...@google.com> wrote:
> > > > > > > > Hi,
>
> > > > > > > > Upon some further investigation, it seems that this is the
> > result of
> > > > > the
> > > > > > > new
> > > > > > > > handling of CPU intensive requests, more information about
> > which can
> > > > > be
> > > > > > > > found here:
> > > > > > >http://code.google.com/appengine/docs/quotas.html#Request_Limits
>
> > > > > > > > Specifically "Applications that are heavily cpu-bound, on the
> > other
> > > > > hand,
> > > > > > > > may incur some additional latency in long-running requests in
> > order
> > > > > to
> > > > > > > make
> > > > > > > > room for other apps sharing the same servers. "
>
> > > > > > > > Essentially, if we observe that you have some heavily cpu-bound
> > > > > requests,
> > > > > > > > your handler may experience additional latency. This may not
> > always
> > > > > > > happen,
> > > > > > > > and for the higher cpu request handlers, there is no way to
> > know
> > > > > exactly
> > > > > > > > when it may happen.
>
> > > > > > > > -Marzia
>
> > > > > > > > On Wed, Feb 18, 2009 at 10:21 AM, Nick Winter <
> > livel...@gmail.com>
> > > > > > > wrote:
>
> > > > > > > > > We've been seeing pretty brutal response times intermittently
> > for
> > > > > our
> > > > > > > > > app (id: skrit), which I can't figure out. Some more info:
>
> > > > > > > > > * They're clustered in time: all requests will be slow for
> > several
> > > > > > > > > seconds at a time, dozens of times over a couple hours
> > > > > > > > > * The long periods of slowness often happen in the morning,
> > > > > although
> > > > > > > > > not always, and not every morning
> > > > > > > > > * Traffic doesn't appear to be related, and is low (less than
> > 5
> > > > > > > > > requests per second)
> > > > > > > > > * It's not instance startup costs. I'm logging when things
> > are
> > > > > > > > > imported, and on a small request with no datastore
> > interaction:
> > > > > > > > > -- with no startup costs, normally around 30-200ms, spikes to
> > > > > > > > > 1300-1600ms
> > > > > > > > > -- with startup costs, normally around 1300-1600ms, spikes to
> > > > > > > > > 4000-11500ms
> > > > > > > > > * It doesn't seem to be related to dynamic get latency or
> > anything
> > > > > > > > > else on the serving status page. Initially, we thought it was
> > > > > loosely
> > > > > > > > > correlated, but I think those were just flukes. This happens
> > much
> > > > > more
> > > > > > > > > often, and for much longer, than serving latency is ever
> > high.
> > > > > > > > > * It happens on all requests; I've just given numbers for
> > simplest/
> > > > > > > > > most common request.
>
> > > > > > > > > As far as I can tell, this has only been happening for the
> > past
> > > > > month
> > > > > > > > > and a half or so.
>
> > > > > > > > > Any ideas? It's as if we're just intermittently being given
> > really
> > > > > > > > > slow serving.- Hide quoted text -
>
> > > > - Show quoted text -- Hide quoted text -
>
> > > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -
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