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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
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
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