Hi,
I use thredds as opendap server for some large netcdf-files (CF-1.0,
size > 1.1GB). When selecting to download the whole file with the 'Get
ASCII' or 'GET BINARY', thredds crashes with a 'Java heap error'.
I'm currently using a default memory setup, i.e. -Xmx512MB for tomcat.
How much memory will I need to avoid this problem. Does DODS read the
whole file at once or variable after variable, or even slice after
slice? Or are there some adjustments I can make to reduce memory
consumption?
Best regards,
Heiko
Details:
DODServlet ERROR (anyExceptionHandler): java.lang.OutOfMemoryError: Java
heap space
ReqState:
serverClassName: 'thredds.server.opendap.NcDODSServlet'
dataSet: 'XXXX.nc'
requestSuffix: 'ascii'
CE: ''
compressOK: true
InitParameters:
DebugOn: ''
maxNetcdfFilesCached: '10'
java.lang.OutOfMemoryError: Java heap space
at ucar.nc2.N3raf.readData(N3raf.java:77)
at ucar.nc2.N3iosp.readData(N3iosp.java:159)
at ucar.nc2.NetcdfFile.readData(NetcdfFile.java:1374)
at ucar.nc2.Variable._read(Variable.java:923)
at ucar.nc2.Variable.read(Variable.java:618)
at thredds.server.opendap.NcSDArray.read(NcSDArray.java:102)
at thredds.server.opendap.NcSDGrid.read(NcSDGrid.java:59)
at opendap.servlet.AsciiWriter.writeAsc(AsciiWriter.java:95)
at opendap.servlet.AsciiWriter.toASCII(AsciiWriter.java:56)
at
opendap.servlet.AbstractServlet.doGetASC(AbstractServlet.java:1029)
at opendap.servlet.AbstractServlet.doGet(AbstractServlet.java:1630)
at
thredds.server.opendap.NcDODSServlet.doGet(NcDODSServlet.java:269)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:698)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
...
Thredds-Version:
Built-By: caron
Built-On: 2008-02-20 22:56:05
Implementation-Title: THREDDS Data Server
Implementation-Version: 3.16.33
Implementation-Vendor: UCAR/Unidata
Running on tomcat 6.0.16 with jdk.1.6.0_04 on debian 4.0.
--
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
