Hi,
we just had a crash of the thredds4.0.25/tomcat server and I was able to
analyse a bit the system before the operators restarted it.
Error message was: 'Too many open files' and checking the open files
with lsof or /proc/PID/fd showed 1021 open netcdf-files for the
tomcat-pid. We haven't made any changes to the thredds4 configuration
concerning the file-caches, so they should be between 200-400. We're
using WCS, too, so this might add some more files, but still not up to 1021.
We also use some aggregations of netcdf files, so one
'thredds-aggregation' might consist of some hundred netcdf-files. Maybe
this is counted as one file in the fileCache?
I currently try to avoid further crashes by increasing the ulimit -n
from 1024 to 16384, but I would rather be able to tune the file-cache
properly instead of throwing more resources at it.
Best regards,
Heiko
--
Dr. Heiko Klein Tel. + 47 22 96 32 58
Development Section / IT Department Fax. + 47 22 69 63 55
Norwegian Meteorological Institute http://www.met.no
P.O. Box 43 Blindern 0313 Oslo NORWAY
