I have a MAAS with 100+ nodes. It's taking 6-8 seconds to respond to some requests, like node page listings and image page listings.
Here's some examples; the last two numbers in the log are the log time in seconds/microseconds.
10.90.0.14 - - [11/Dec/2014:23:18:07 +0000] "GET /MAAS/nodes/node-5f9c14e6-ae98-11e3-b194-00163efc5068/view/?sequence=45 HTTP/1.1" 200 1282 "http://10.245.0.10/MAAS/nodes/node-5f9c14e6-ae98-11e3-b194-00163efc5068/view/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" **7 7626093**
10.90.0.14 - - [11/Dec/2014:23:18:07 +0000] "GET /MAAS/nodes/node-5f9c14e6-ae98-11e3-b194-00163efc5068/view/?sequence=35 HTTP/1.1" 200 1282 "http://10.245.0.10/MAAS/nodes/node-5f9c14e6-ae98-11e3-b194-00163efc5068/view/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" **7 7762253**
10.90.0.14 - - [11/Dec/2014:23:18:08 +0000] "GET /MAAS/nodes/node-a0620c92-c4cd-11e3-8102-00163efc5068/view/?sequence=1131 HTTP/1.1" 200 1453 "http://10.245.0.10/MAAS/nodes/node-a0620c92-c4cd-11e3-8102-00163efc5068/view/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/37.0.2062.120 Chrome/37.0.2062.120 Safari/537.36" **6 6048212**
10.90.0.38 - - [11/Dec/2014:23:17:56 +0000] "GET /MAAS/images/?sequence=10 HTTP/1.1" 200 638 "http://10.245.0.10/MAAS/images/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36" **7 7129086**
Not all requests take this long:
10.90.0.38 - - [11/Dec/2014:23:18:03 +0000] "GET /MAAS/nodes/?id=node-a08c25d6-c4cd-11e3-8102-00163efc5068&id=node-a0754dc0-c4cd-11e3-824b-00163efc5068&id=node-a0620c92-c4cd-11e3-8102-00163efc5068&id=node-a04d5ba8-c4cd-11e3-824b-00163efc5068&id=node-a036d91e-c4cd-11e3-8102-00163efc5068&id=node-a0223dec-c4cd-11e3-824b-00163efc5068&id=node-a00d6a0c-c4cd-11e3-8102-00163efc5068&id=node-9ff3a32e-c4cd-11e3-824b-00163efc5068&id=node-9fd976c0-c4cd-11e3-8102-00163efc5068&id=node-9fc3db80-c4cd-11e3-824b-00163efc5068&id=node-9faae724-c4cd-11e3-8102-00163efc5068&id=node-9f89500a-c4cd-11e3-824b-00163efc5068&id=node-9f70a10e-c4cd-11e3-8102-00163efc5068&id=node-9f580cca-c4cd-11e3-824b-00163efc5068&id=node-9f40d3ca-c4cd-11e3-8102-00163efc5068&id=node-9f22e392-c4cd-11e3-824b-00163efc5068&id=node-9f0983ac-c4cd-11e3-8102-00163efc5068&id=node-9eee5bae-c4cd-11e3-824b-00163efc5068&id=node-9ed45f60-c4cd-11e3-8102-00163efc5068&id=node-9eb864f4-c4cd-11e3-824b-00163efc5068&id=node-9e9e2eb8-c4cd-11e3-8102-00163efc5068&id=node-9e7a2a18-c4cd-11e3-824b-00163efc5068&id=node-9e5f6976-c4cd-11e3-8102-00163efc5068&id=node-9e496b8a-c4cd-11e3-824b-00163efc5068&id=node-9e308d0e-c4cd-11e3-8102-00163efc5068&id=node-9e0f7d44-c4cd-11e3-824b-00163efc5068&id=node-9df8a42a-c4cd-11e3-824b-00163efc5068&id=node-9dd8bed0-c4cd-11e3-8102-00163efc5068&id=node-9db5ca7e-c4cd-11e3-824b-00163efc5068&id=node-9d9cdafa-c4cd-11e3-824b-00163efc5068&id=node-9d847d52-c4cd-11e3-824b-00163efc5068&id=node-9d6c8a30-c4cd-11e3-8102-00163efc5068&id=node-9d4e6a5a-c4cd-11e3-824b-00163efc5068&id=node-9d30e4e4-c4cd-11e3-8102-00163efc5068&id=node-94afcdc8-aea0-11e3-9074-00163efc5068&id=node-30459fcc-ae9e-11e3-b194-00163efc5068&id=node-5a2fcafe-ae9b-11e3-b194-00163efc5068&id=node-49c2f628-ae9b-11e3-b194-00163efc5068&id=node-4990416a-ae9b-11e3-9074-00163efc5068&id=node-49653d80-ae9b-11e3-b194-00163efc5068&id=node-4951e5e6-ae9b-11e3-9074-00163efc5068&id=node-a5224922-ae98-11e3-b194-00163efc5068&id=node-601eca8a-ae98-11e3-9074-00163efc5068&id=node-600e169a-ae98-11e3-b194-00163efc5068&id=node-5fccd02c-ae98-11e3-9074-00163efc5068&id=node-5f9c14e6-ae98-11e3-b194-00163efc5068&id=node-4cb16f16-ae98-11e3-b194-00163efc5068&id=node-0f5dc0ee-ae1e-11e3-9074-00163efc5068&id=node-12dfa450-ae17-11e3-9074-00163efc5068&id=node-0fd68e9a-ae17-11e3-b194-00163efc5068&sequence=7 HTTP/1.1" 200 3362 "http://10.245.0.10/MAAS/nodes/?page=3" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36" **0 356661**
10.245.0.10 - - [11/Dec/2014:23:18:26 +0000] "GET /MAAS/rpc/ HTTP/1.0" 200 1102 "-" "Twisted PageGetter" **0 51178**
This is a big system and the load average is low overall, but the twisted pserv process is taking up 100% of one core.
This is with MAAS 1.7.1~rc1+bzr3322-0ubuntu1~trusty.
This MAAS server also has many nodes that are down and have BMCs that can't be reached. It's almost always trying to query a node, and ps output usually shows something like this:
http:// paste.ubuntu. com/9481782/