Same problem today same time.
I've created an issue:
Issue 8788 <http://code.google.com/p/googleappengine/issues/detail?id=8788>: 
Every day around 9.00 AM Brussels time, huge drop in GAE performances

Please star it.



Le mercredi 6 février 2013 13:59:05 UTC+1, Jacob G a écrit :
>
> Since Monday evening, I've seen terrible performance throughout the day on 
> GAE. Almost every request spawns a new instance, and the prior instance(s) 
> disappear without any information in the logs. Latency is terrible!
>
> Issue created here:  
> http://code.google.com/p/googleappengine/issues/detail?id=8781
>
> Make sure you star it so it gets attention!
>
> On Wednesday, February 6, 2013 6:39:49 AM UTC-5, gafal wrote:
>>
>> This might help: At 9:00 AM, the GAE Daily quotas are reset. It might put 
>> GAE under a heavy load.
>>
>> here is a log of a cron  (requestwhich does nothing (see code here under) 
>> execution duration.
>>
>>    1. 
>>       1.  2013-02-06 09:39:00.657 /cron/StayUp 200 6ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    2. 
>>       1.  2013-02-06 09:38:00.625 /cron/StayUp 200 76ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    3. 
>>       1.  2013-02-06 09:37:00.475 /cron/StayUp 200 8ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    4. 
>>       1.  2013-02-06 09:36:00.444 /cron/StayUp 200 7ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    5. 
>>       1.  2013-02-06 09:35:00.418 /cron/StayUp 200 9ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    6. 
>>       1.  2013-02-06 09:34:02.374 /cron/StayUp 200 1411ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    7. 
>>       1.  2013-02-06 09:33:00.869 /cron/StayUp 200 7ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    8. 
>>       1.  2013-02-06 09:32:00.789 /cron/StayUp 200 31ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    9. 
>>       1.  2013-02-06 09:31:00.701 /cron/StayUp 200 8ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    10. 
>>       1.  2013-02-06 09:30:00.629 /cron/StayUp 200 7ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    11. 
>>       1.  2013-02-06 09:29:00.561 /cron/StayUp 200 13ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    12. 
>>       1.  2013-02-06 09:28:02.473 /cron/StayUp 200 1432ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    13. 
>>       1.  2013-02-06 09:27:01.572 /cron/StayUp 200 525ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    14. 
>>       1.  2013-02-06 09:26:00.876 /cron/StayUp 200 11ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    15. 
>>       1.  2013-02-06 09:25:00.747 /cron/StayUp 200 534ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    16. 
>>       1.  2013-02-06 09:24:01.129 /cron/StayUp 200 82ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    17. 
>>       1.  2013-02-06 09:23:03.786 /cron/StayUp 200 2988ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    18. 
>>       1.  2013-02-06 09:22:00.555 /cron/StayUp 200 503ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    19. 
>>       1.  2013-02-06 09:21:01.022 /cron/StayUp 200 224ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    20. 
>>       1.  2013-02-06 09:20:01.810 /cron/StayUp 200 1274ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    21. 
>>       1.  2013-02-06 09:19:02.328 /cron/StayUp 200 1778ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    22. 
>>       1.  2013-02-06 09:18:00.498 /cron/StayUp 200 54ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    23. 
>>       1.  2013-02-06 09:17:04.781 /cron/StayUp 500 3733ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>       2.  W 2013-02-06 09:17:04.781 A problem was encountered with the 
>>       process that handled this request, causing it to exit. This is likely 
>> to 
>>       cause a new process to be used for the nex 
>>    24. 
>>       1.  2013-02-06 09:16:01.497 /cron/StayUp 200 1246ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    25. 
>>       1.  2013-02-06 09:15:02.913 /cron/StayUp 200 2100ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    26. 
>>       1.  2013-02-06 09:14:00.588 /cron/StayUp 200 44ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    27. 
>>       1.  2013-02-06 09:13:01.350 /cron/StayUp 200 375ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    28. 
>>       1.  2013-02-06 09:12:29.899 /cron/StayUp 200 89203ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>       2.  I 2013-02-06 09:11:23.884 javax.servlet.ServletContext log: 
>>       Initializing Spring root WebApplicationContext 
>>       3.  I 2013-02-06 09:12:29.895 This request caused a new process to 
>>       be started for your application, and thus caused your application code 
>> to 
>>       be loaded for the first time. This requ 
>>    29. 
>>       1.  2013-02-06 09:10:00.559 /cron/StayUp 200 10ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    30. 
>>       1.  2013-02-06 09:09:00.335 /cron/StayUp 200 55ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    31. 
>>       1.  2013-02-06 09:08:01.068 /cron/StayUp 200 370ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    32. 
>>       1.  2013-02-06 09:07:00.547 /cron/StayUp 200 100ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    33. 
>>       1.  2013-02-06 09:06:00.059 /cron/StayUp 200 11ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    34. 
>>       1.  2013-02-06 09:05:01.017 /cron/StayUp 200 161ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    35. 
>>       1.  2013-02-06 09:04:00.693 /cron/StayUp 200 15ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    36. 
>>       1.  2013-02-06 09:03:00.600 /cron/StayUp 200 25ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    37. 
>>       1.  2013-02-06 09:02:00.558 /cron/StayUp 200 9ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    38. 
>>       1.  2013-02-06 09:01:00.338 /cron/StayUp 200 143ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    39. 
>>       1.  2013-02-06 09:00:01.092 /cron/StayUp 200 230ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    40. 
>>       1.  2013-02-06 08:59:00.819 /cron/StayUp 200 182ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    41. 
>>       1.  2013-02-06 08:58:00.553 /cron/StayUp 200 34ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    42. 
>>       1.  2013-02-06 08:57:01.346 /cron/StayUp 200 401ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    43. 
>>       1.  2013-02-06 08:56:00.868 /cron/StayUp 200 210ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    44. 
>>       1.  2013-02-06 08:55:00.561 /cron/StayUp 200 12ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    45. 
>>       1.  2013-02-06 08:54:00.454 /cron/StayUp 200 9ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    46. 
>>       1.  2013-02-06 08:53:00.331 /cron/StayUp 200 9ms 0kb AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    47. 
>>       1.  2013-02-06 08:52:00.242 /cron/StayUp 200 12ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    48. 
>>       1.  2013-02-06 08:51:01.118 /cron/StayUp 200 70ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    49. 
>>       1.  2013-02-06 08:50:00.903 /cron/StayUp 200 223ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    50. 
>>       1.  2013-02-06 08:49:00.592 /cron/StayUp 200 42ms 0kb 
>> AppEngine-Google; 
>>       (+http://code.google.com/appengine) 
>>    
>>
>>
>> public class StayUp extends HttpServlet {
>>
>>     /**
>>      * 
>>      */
>>     private static final long serialVersionUID = -3371245850830199827L;
>>
>>     public void doGet(HttpServletRequest req, HttpServletResponse resp) 
>> throws ServletException, IOException {
>>
>>     
>>
>>     }
>>
>> Le mercredi 6 février 2013 12:27:59 UTC+1, Per a écrit :
>>>
>>>
>>> While I haven't seen that problem, I'd love to learn more about it. Do 
>>> you have more information other than "it being slow"? Did you try running 
>>> appstats? Is it db-related, memcache, CPU slowness, or maybe even 
>>> session-related? Google may find out by looking at your app, but us others 
>>> cannot, and I'd love to hear what that actual issue is, in case we run into 
>>> something similar.
>>>
>>>
>>> On Wednesday, February 6, 2013 9:12:40 AM UTC+1, gafal wrote:
>>>>
>>>> Happening again today 6th February.
>>>> Can anyone at Google just care? It would really be appreciated...
>>>>
>>>>
>>>> Le mardi 5 février 2013 09:18:55 UTC+1, gafal a écrit :
>>>>>
>>>>> I've been experiencing this for almost a week now.
>>>>>
>>>>> Requests take 10x longer than usual!!
>>>>>
>>>>> It seems to start around 9 and stop around 9:30...
>>>>>
>>>>>
>>>>> my app id is myagendapro
>>>>> Can anyone have a look? 
>>>>>
>>>>

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