Thanks Patrice. Your second document refers to Python. I'm using PHP - are the same options applicable to that too?
I'm just wondering what to do when there are sufficient numbers of users of my website (at any given time) to cause the running instances to run out of memory. Logically, the thing to do would be to get more instances fired up while the extra requests are coming in. I really need a simple, automated as possible solution (hence why I'm using app engine). If it doesn't respond to memory usage directly, is there a way to instruct or trick the App Engine autoscaler to initiate more instances (i.e. trigger it to do so based on some other metric)? Surely there has to be some alternative here to my users seeing my app fail due to out of memory errors!? Thanks, Alex On Tuesday, July 21, 2015 at 6:37:08 PM UTC+1, Patrice (Cloud Platform Support) wrote: > > Hi Alex, > > Scaling doesn't really happen based on memory, but based on latency and > number of requests. It's highly tied into your scaling settings (either > manual, automatic, or basic), and which exact config you have. You can > lookup this document <https://cloud.google.com/appengine/docs/scaling> that > contains some information on scaling, or this one > <https://cloud.google.com/appengine/docs/python/modules/#Python_Instance_scaling_and_class> > > which explains the configuration you can setup (look a bit further down > than my link, it includes how to setup the three types of scaling and the > options available to you) > > But to answer "can we have autoscaling when an instance run out of > memory", not on App Engine directly. One thing you definitely can do is to > use ManagedVMs <https://cloud.google.com/appengine/docs/managed-vms/> and > the beta autoscaler <https://cloud.google.com/compute/docs/autoscaler/>, > which you can set to "target utilization level" based on CPU utilization > <https://cloud.google.com/compute/docs/autoscaler/scaling-cpu-load-balancing#scale_based_on_cpu_utilization> > . > > Since app engine scales a bit differently, there is definitely a way to do > it, but it would be a workaround that would be way more involved than > simply switching to ManagedVMs, so I wouldn't recommend it, as it would be > clunky, might degrade customer experience (by making your whole app a tad > slower). > > Cheers! > > On Monday, July 20, 2015 at 4:07:05 PM UTC-4, Alex Kerr wrote: >> >> Hi, >> >> I've got a PHP app running in standard AppEngine. It does use a bit of >> memory for in-app image manipulation. I'm wondering what happens when there >> are enough concurrent users of my web app that the current instance(s) >> don't have the memory to handle more users (i.e. so it's not a CPU load >> issue, or other things (?) that might cause the app to scale). I don't want >> the users to see errors or a non-working app, I just want the AppEngine >> autoscaler to add another instance(s). >> >> Is this how things work? If not, is there a way to get autoscaling to >> happen on the basis of current instances running out of memory? >> >> Many thanks! >> Alex >> > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/4c9ed5d3-9b66-4710-a041-9273e514ddbb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
