(no subject)

Hello,

 

My intention is to obtain time series analysis results of some variables from the WRF model output during the last half-hour of integral. I set the output interval as 1 second, so there are 1800 times of output results in total during the integral of half hour. Previously I had them written in one file. The NCL was not able to read variables out of the mega file close to 300 Gbytes in size encountering memory-related problem.

 

Now I have the output results written in 1800 files, i.e. one file for one output of 1 second. So every file is less than 0.5 Gbytes in size now.

 

I write the NCL code as follows:

 

-------------------------------------------------------------------------------------------------------

 

begin

 

fils=systemfunc("ls wrfout_d01_0001-01-01_03:*")

f=addfiles(fils+".nc","r")

ListSetType(f,"join")

 

u0=f[:]->U

v0=f[:]->V

w0=f[:]->W

 

th00=f[:]->T

th0=th00+300.0

 

tke0=f[:]->TKE

xkmv0=f[:]->XKMV

xkhv0=f[:]->XKHV

 

ph0=f[:]->PH

phb0=f[:]->PHB

 

¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­

 

-------------------------------------------------------------------------------------------------------

 

However I got the error message as follows:

 

-------------------------------------------------------------------------------------------------------

 

Copyright (C) 1995-2007 - All Rights Reserved

University Corporation for Atmospheric Research

NCAR Command Language Version 5.0.0

The use of this software is governed by a License Agreement.

See http://www.ncl.ucar.edu/ for more details.

fatal:Too many open files

fatal:Could not open (wrfout_d01_0001-01-01_03:13:10)

fatal:Too many open files

fatal:Could not open (wrfout_d01_0001-01-01_03:13:09)

fatal:Too many open files

fatal:Could not open (wrfout_d01_0001-01-01_03:13:08)

fatal:Too many open files

fatal:Could not open (wrfout_d01_0001-01-01_03:13:07)

fatal:Too many open files

fatal:Could not open (wrfout_d01_0001-01-01_03:13:06)

¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­

¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­

¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­

fatal:Too many open files

fatal:Could not open (wrfout_d01_0001-01-01_03:00:02)

fatal:Too many open files

fatal:Could not open (wrfout_d01_0001-01-01_03:00:01)

 

-------------------------------------------------------------------------------------------------------

 

I have uploaded the NCL script file (nclpost.ncl) and one of the data files (wrfout_d01_0001-01-01_03:00:01) to the directory ¡®incoming¡¯ in ftp.cgd.ucar.edu.

 

Thanks a lot.

 

Gang

 

************************************
Gang Liu
Department of Atmospheric Sciences
Nanjing University
Nanjing 210093
P. R. China
Phone: 86-25-83595185 (o)
Email: gangliu_at_nju.edu.cn
************************************

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Received on Fri Dec 05 2008 - 04:02:10 MST