Hi,
I wonder if GAE is distributed to several datacenters or not. I found
no official information on this topic but several personal tests show
that it is indeed deployed to several geographic locations and the
closest one is chosen to server the request.
Tests from several locations (decix in germany, japan, china and us
(peer1 network) show really confusing results. Measurings are done
"against" ghs.google.com and .appspot.com.
Here the mtr's to ghs.google.com
>From peer1 network (us): 170msec (urghs !!)
Packets Pings
Host Loss% Snt Last Avg
Best Wrst StDev
...
4. 10ge-ten1-3.dal-eqx-cor-2.peer1.net 0.0% 212 7.6 11.9
7.5 192.6 23.9
5. 10ge-ten1-1.dal-eqx-cor-1.peer1.net 0.0% 212 7.5 8.9
7.5 95.8 9.6
6. 10ge.ten1-2.la-600w-cor-2.peer1.net 0.0% 212 44.7 44.8
44.0 140.9 7.0
7. 64.34.254.42 0.0% 212 44.0 46.6
43.9 170.7 13.9
8. 216.239.46.180 0.0% 212 44.1 44.6
44.0 75.3 2.8
9. 72.14.233.110 0.0% 212 114.2 78.2
74.0 131.2 12.0
10. 72.14.238.243 0.0% 212 75.9 81.0
75.9 131.1 10.3
11. 209.85.251.8 0.0% 212 1411. 94.5
83.3 1411. 91.3
12. 209.85.250.55 0.0% 212 1350. 161.5
151.1 1350. 82.6
13. 209.85.241.84 0.0% 212 1291. 163.7
152.5 1291. 79.2
66.249.95.130
14. 216.239.43.123 0.0% 212 205.3 166.0
162.0 231.2 10.7
15. 66.249.95.133 0.0% 212 170.2 167.7
166.2 194.1 4.1
16. 216.239.48.5 0.0% 212 172.5 172.5
170.8 263.0 8.7
17. 64.233.174.53 0.0% 212 170.9 176.6
170.8 358.0 17.3
64.233.174.29
18. 209.85.250.1 0.0% 212 171.1 176.9
171.0 195.2 4.9
209.85.255.245
209.85.250.5
209.85.255.249
19. bw-in-f121.1e100.net 0.0% 212 173.2 172.4
171.0 175.5 1.3
>From germany(decix): 21msec
Packets Pings
Host Loss% Snt Last Avg
Best Wrst StDev
...
4. de-cix20.net.google.com 0.0% 11 59.8 9.2
0.7 59.8 19.2
5. 209.85.255.176 0.0% 11 1.4 1.4
1.0 1.8 0.2
6. 216.239.48.11 0.0% 11 12.8 14.3
12.2 21.4 3.4
7. 216.239.48.5 0.0% 11 21.7 17.6
16.6 21.7 1.8
8. 64.233.174.53 0.0% 11 17.2 164.0
16.6 1608. 479.2
64.233.174.29
9. 209.85.255.245 0.0% 11 24.5 21.1
16.8 28.2 3.6
209.85.250.1
209.85.250.5
10. bw-in-f121.1e100.net 0.0% 11 17.0 17.3
17.0 17.8 0.3
>From china: 75msec
Packets Pings
Host Loss% Snt Last Avg
Best Wrst StDev
...
4. 124.74.254.157 0.0% 13 1.1 1.1
0.6 1.7 0.3
5. 61.152.86.38 0.0% 13 0.7 1.0
0.7 1.8 0.3
6. 202.97.35.114 0.0% 13 0.8 0.8
0.7 1.2 0.1
7. 202.97.34.50 7.7% 13 1.8 1.8
1.2 3.2 0.6
8. 202.97.33.5 0.0% 13 1.2 7.8
0.9 44.7 15.7
9. ???
10. 209.85.249.192 0.0% 12 37.3 42.1
37.3 92.4 15.9
209.85.249.195
11. 209.85.250.90 0.0% 12 3060. 325.5
74.3 3060. 861.4
209.85.250.86
12. 209.85.250.101 0.0% 12 75.0 75.1
74.3 76.1 0.7
209.85.243.21
209.85.250.103
13. 209.85.241.154 0.0% 12 75.2 79.7
74.8 87.3 4.5
209.85.241.166
209.85.241.162
209.85.241.158
14. tx-in-f121.1e100.net 0.0% 12 75.9 75.6
74.2 76.3 0.7
mtr's to appspot (I used snapabug.appspot.com):
US: 73msec
Host Loss% Snt Last Avg
Best Wrst StDev
...
4. 10ge-ten1-3.dal-eqx-cor-2.peer1.net 0.0% 29 7.5 10.5
7.5 93.8 16.0
5. 10ge-ten1-1.dal-eqx-cor-1.peer1.net 0.0% 28 7.5 7.6
7.5 8.0 0.1
6. 10ge.ten1-2.la-600w-cor-2.peer1.net 0.0% 28 44.0 46.9
44.0 125.5 15.4
7. 64.34.254.42 0.0% 28 43.9 44.4
43.9 54.6 2.0
8. 216.239.46.182 0.0% 28 60.9 49.0
44.1 89.6 11.8
9. 72.14.232.85 0.0% 28 71.1 72.2
70.9 95.8 4.7
10. 216.239.48.34 0.0% 28 74.2 74.0
73.4 74.8 0.3
216.239.43.220
216.239.43.228
209.85.250.144
11. 64.233.174.127 0.0% 28 74.9 98.3
73.4 184.5 33.2
64.233.174.125
64.233.174.101
64.233.174.103
12. 216.239.46.6 0.0% 28 76.9 79.6
73.7 86.5 4.3
216.239.46.2
216.239.46.22
13. pz-in-f141.1e100.net 0.0% 28 73.7 73.9
73.6 76.0 0.5
DE: 2msec
Host Loss% Snt Last Avg
Best Wrst StDev
...
3. de-cix20.net.google.com 0.0% 8 0.8 13.8
0.8 103.4 36.2
4. 209.85.255.178 0.0% 8 1.7 5.8
1.3 36.0 12.2
5. 72.14.232.201 0.0% 8 1.4 2.9
1.4 7.6 2.7
72.14.232.203
6. 72.14.239.170 0.0% 8 1.7 4.7
1.7 13.8 4.5
72.14.233.210
72.14.239.174
7. fk-in-f141.1e100.net 0.0% 8 2.2 1.9
1.4 2.4 0.3
CN: 276msec
Packets Pings
Host Loss% Snt Last Avg
Best Wrst StDev
...
3. 222.73.90.61 0.0% 14 0.3 0.2
0.1 0.3 0.1
4. 124.74.254.149 0.0% 14 1.4 1.3
0.7 1.8 0.3
5. 61.152.86.6 0.0% 14 0.9 1.1
0.8 2.1 0.3
6. 202.97.33.26 0.0% 14 0.6 0.6
0.6 0.7 0.0
7. 202.97.33.54 0.0% 14 1.7 1.4
1.1 1.8 0.2
8. 202.97.33.5 0.0% 14 0.9 1.7
0.8 11.6 2.9
9. ???
10. 209.85.249.192 0.0% 13 37.2 42.0
37.2 95.7 16.2
11. 216.239.43.212 0.0% 13 261.7 271.5
259.8 308.6 13.7
209.85.248.131
12. 216.239.46.212 0.0% 13 269.8 273.0
268.6 278.4 3.7
216.239.46.204
13. 216.239.48.137 0.0% 13 273.6 274.3
266.7 279.7 3.2
216.239.48.139
216.239.48.167
216.239.48.165
14. 216.239.49.246 0.0% 13 269.8 275.9
265.6 288.4 5.7
216.239.49.166
209.85.254.150
209.85.254.146
15. px-in-f141.1e100.net 0.0% 13 273.3 276.3
269.8 279.6 2.9
Can anyone explain this strange behavior?
* IS GAE geographically distributed or not?
* Or just static content via a CDN?
* Why is US so slow?
* Why the major differences between ghs and appspot?
Please Google, it would be nice to get an official statement :)
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