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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Dennis, I tried 4.2-rc2, and conformed your test. I tried to NCL, the problem was gone. The questions will be: when this will be a stable release? Is it a good idea to have a netcdf-rc in NCL release? Thanks, Wei huangwei@xxxxxxxx VETS/CISL National Center for Atmospheric Research P.O. Box 3000 (1850 Table Mesa Dr.) Boulder, CO 80307-3000 USA (303) 497-8924 On Mar 8, 2012, at 3:20 PM, Dennis Heimbigner wrote: > I tested the following command on the current latest trunk > (which should be the same as netcdf 4.2-rc2). > ncdump -v air > "http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc"; > and it worked ok. > I also tested your c program and it worked also. > Have you tried the rc2 release? > > =Dennis Heimbigner > Unidata > > > Wei Huang wrote: >> Dennis, >> You probably should try: >> http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc.html >> Which will let you access the dataset through browser. >> Wei >> huangwei@xxxxxxxx >> VETS/CISL >> National Center for Atmospheric Research >> P.O. Box 3000 (1850 Table Mesa Dr.) >> Boulder, CO 80307-3000 USA >> (303) 497-8924 >> On Mar 8, 2012, at 2:50 PM, Dennis Heimbigner wrote: >>> Well it should not seg fault. >>> When I plugged this >>>> http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc?air >>> into my browser, I got the following error: >>>> Error { >>>> code = 403; >>>> message = "Request too big=130.0 Mbytes, max=50.0"; >>>> }; >>> =Dennis Heimbigner >>> Unidata >>> >>> >>> Wei Huang wrote: >>>> NetCDF group, >>>> Recently we are testing opendap with NetCDF. >>>> Our code give segmentation vault, and we trace back this to NetCDF opendap. >>>> The link we tried is: >>>> http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc >>>> We tried "ncdump -h …", which worked fine, but "ncdump -v air …" gave >>>> segmentation fault. >>>> We tried a simple c code, below, which give segmentation fault as well. >>>> Has anyone seen this before? >>>> Thanks, >>>> Wei >>>> --------- >>>> C - code: >>>> #include <stdio.h> >>>> #include <stdlib.h> >>>> #include <netcdf.h> >>>> int main(int *argc, char **argv) >>>> { >>>> char flnm[] = >>>> "http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/ncep.reanalysis.dailyavgs/pressure/air.1948.nc";; >>>> int status; /* error status */ >>>> int ncid; /* netCDF ID */ >>>> int varid; /* variable ID */ >>>> static size_t start[16]; >>>> static size_t count[16]; >>>> short *vals; >>>> nc_type type; /* variable type */ >>>> int ndims; /* number of dims */ >>>> int dimids[NC_MAX_VAR_DIMS]; /* dimension IDs */ >>>> int natts; /* number of attributes */ >>>> int nvars, ngatts, unlimdimid; >>>> size_t length, recs; >>>> char recname[NC_MAX_NAME+1]; >>>> int n; >>>> status = nc_open(flnm, NC_NOWRITE, &ncid); >>>> /* >>>> *if (status != NC_NOERR) handle_error(status); >>>> */ >>>> fprintf(stderr, "ncid = %d\n", ncid); >>>> status = nc_inq(ncid, &ndims, &nvars, &ngatts, &unlimdimid); >>>> status = nc_inq_varid(ncid, "air", &varid); >>>> fprintf(stderr, "varid = %d\n", varid); >>>> status = nc_inq_var(ncid, varid, 0, &type, &ndims, dimids, >>>> &natts); >>>> length = 1; >>>> for(n = 0; n < ndims; ++n) >>>> { >>>> status = nc_inq_dim(ncid, dimids[n], recname, &count[n]); >>>> fprintf(stderr, "dim %d: id = %d, name: <%s>, length = %ld\n", >>>> n, dimids[n], recname, (long) count[n]); >>>> length *= count[n]; >>>> start[n] = 0; >>>> } >>>> fprintf(stderr, "length = %ld\n", (long) length); >>>> vals = (short *) malloc(length * sizeof(short)); >>>> /*read values*/ >>>> status = nc_get_vara(ncid, varid, start, count, vals); >>>> fprintf(stderr, "vals[0] = %d\n", vals[0]); >>>> free(vals); >>>> return ( 0 ); >>>> } >>>> Error message: >>>> ncid = 65536 >>>> varid = 4 >>>> dim 0: id = 0, name: <time>, length = 366 >>>> dim 1: id = 2, name: <level>, length = 17 >>>> dim 2: id = 1, name: <lat>, length = 73 >>>> dim 3: id = 3, name: <lon>, length = 144 >>>> length = 65405664 >>>> Program received signal EXC_BAD_ACCESS, Could not access memory. >>>> Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000008 >>>> 0x000000010003163c in buildcachenode34 (nccomm=0x100f15c00, >>>> constraint=0x102602650, varlist=0x102602490, cachep=0x7fff5fbfb148, >>>> isprefetch=0) at cache.c:231 >>>> 231 cache->cachesize -= node->xdrsize; >>>> (gdb) where >>>> #0 0x000000010003163c in buildcachenode34 (nccomm=0x100f15c00, >>>> constraint=0x102602650, varlist=0x102602490, cachep=0x7fff5fbfb148, >>>> isprefetch=0) at cache.c:231 >>>> #1 0x0000000100046998 in nc3d_getvarx (ncid=65536, varid=4, >>>> startp=0x1004679e0, countp=0x100467960, stridep=0x10048b2a0, >>>> data=0x104000000, dsttype0=3) at getvara3.c:192 >>>> #2 0x000000010004a9fb in NCD3_get_vara (ncid=65536, varid=4, >>>> start=0x1004679e0, edges=0x100467960, value=0x104000000, memtype=3) at >>>> ncd3dispatch.c:203 >>>> #3 0x0000000100008b90 in NC_get_vara (ncid=65536, varid=4, >>>> start=0x1004679e0, edges=0x100467960, value=0x104000000, memtype=3) at >>>> var.c:172 >>>> #4 0x000000010000a7df in nc_get_vara (ncid=65536, varid=4, >>>> start=0x1004679e0, edges=0x100467960, value=0x104000000) at var.c:939 >>>> #5 0x0000000100001ab2 in main () >>>> huangwei@xxxxxxxx >>>> VETS/CISL >>>> National Center for Atmospheric Research >>>> P.O. Box 3000 (1850 Table Mesa Dr.) >>>> Boulder, CO 80307-3000 USA >>>> (303) 497-8924 >>>> ------------------------------------------------------------------------ >>>> _______________________________________________ >>>> netcdfgroup mailing list >>>> netcdfgroup@xxxxxxxxxxxxxxxx >>>> For list information or to unsubscribe, visit: >>>> http://www.unidata.ucar.edu/mailing_lists/ >>> _______________________________________________ >>> netcdfgroup mailing list >>> netcdfgroup@xxxxxxxxxxxxxxxx >>> For list information or to unsubscribe, visit: >>> http://www.unidata.ucar.edu/mailing_lists/ > > _______________________________________________ > netcdfgroup mailing list > netcdfgroup@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/
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