Hello,
just a short report regarding current performance status at University of Heidelberg.
On 21th October we moved AOLServer from our Sun, which hosted Webserver and Oracle at that moment, to a linux box, so our current infrastructre is:
- Front-End:
SuSe Linux 9.0
Processor: Athlon 1.8 GHz
Memory: 1.5 Gb
Network: Ethernet, 100Mb/s
DB-Client: Oracle
AOLServer: 4.0.8 (nsopenssl v3_0beta23 / tcl. 8.4.4)
OpenSSL: OpenSSL 0.9.7d 17 Mar 2004
MTA: Postfix 2.0.14
- DB-Server (as mentioned above):
Solaris 2.8 on Sun Fire 280r
Memory: 2 Gb
Disks: 2 * 36 Gb, 1 * 200 Gb raid
Network: Ethernet, 100Mb/s
DB-Server: Oracle 8.1i (patched)
Additional software running until end of year: webct
- Some facts about our dotLRN-installation:
40282 ACS-Users
2580 dotLRN-Users
22 class instances (current semester, about 40 total), 10 communities / 72 subcommunities
162641 ACS-objects, 114108 ACS-permissions and 11129 fs-objects
- Performance relevant AOLServer configuration parameters:
maxthreads 25
minthreads 20
(Changed minthreads != maxthreads, because there seem to be still some memory leakage issues)
threadtimeout 3600
stacksize 512 Kb
db-pool connections: first 20, second 10, third 5
keepalivetimeout 5
maxkeepalive 100
maxconnections 100
Some objective measurements of page response times before and after migration (calculated by measure-resonstimes.sh):
- /dotlrn
before: 2894 ms
after: 841 ms (internal measure by developer support: 80-100 ms)
- /dotlrn/calendar/cal-item-new
before: 2380 ms
after: 633 ms
- /dotlrn/manage-memberships:
before: 3597 ms
after: 1834 ms
- /dotlrn/classes/3520praktischeinformatik/3520urztest/3520urztest/
before: 7575 ms for class start page and 4589 ms for class file-storage
after: 3093 ms for class start page and 1335 ms for class file-storage
(1694 ms for class start page after removing subgroup- and homework-portlet!)
Alltogether, each page became about twice faster, although there might be still enough things to tune...
(E.g.: For very large query result sets AOLServer seems to need much more (exponential) time to parse the template via templating system compared to very fast output by manual ns_write commands.)
