So....no one else has noticed anything like this???
Regards,
Jamie
On Sep 15, 9:13 am, Traveler1980 <jshar...@gmail.com> wrote:
> Hi Everyone,
>
> I've noticed that CPU occasionally spikes when creating an
> HTTPSession. It only seems to happen when it's been awhile since an
> app has been accessed or when an app is initially deployed.
>
> For example, I created a simple test servlet that creates a session
> and and writes a response:
>
> protected void doGet(HttpServletRequest req, HttpServletResponse resp)
> throws ServletException, IOException {
> req.getSession();
> PrintWriter writer = resp.getWriter();
> writer.write("Test Complete");
> writer.flush();
> writer.close();
>
> }
>
> When I deploy the app and invoke the servlet for the first time, I see
> the following in the admin console:
> 09-15 05:57AM 29.487 /test 200 7184ms 4381cpu_ms 65api_cpu_ms 0kb
> Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.6) Gecko/
> 2009011913 Firefox/3.0.6 (.NET C
>
> Note the high CPU and long response time.
>
> Subsequent session creations are much faster. If I delete my cookies
> and re-invoke the servlet, CPU is approx. 70-80ms.
>
> Now, if I leave the app for awhile (let's say an hour) and hit the
> servlet again, CPU is once again through the roof for the initial
> GET.
>
> Any thoughts about what's going on here? I know that Google's session
> management involves memcache and the datastore. Could the high CPU be
> a side-effect of some initialization routine, etc...?
>
> Thanks for the feedback,
> Jamie
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