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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