Re: performance degrades with filesize

• To: netcdfgroup@xxxxxxxxxxxxxxxx
• Subject: Re: performance degrades with filesize
• From: Steve Emmerson <steve@xxxxxxxxxxxxxxxx>
• Date: Tue, 11 Sep 2001 17:08:14 -0600

Russ,

>Date: Tue, 11 Sep 2001 16:35:41 -0600
>From: Russ Rew <russ@xxxxxxxxxxxxxxxx>
>To: Konrad Hinsen <hinsen@xxxxxxxxxxxxxxx>
>Subject: Re: performance degrades with filesize 

The above message contained the following:

> Specifically, the following C program:
> 
>   http://www.unidata.ucar.edu/packages/netcdf/jg1.c
> 
> accepts a single command-line argument for how many records to write,
> creates a netCDF file with the same structure as John Galbraith's
> Python script, and prints the time required to append each additional
> batch of 5000 records to the initially empty file.
> 
> The times are nearly constant even when the file has grown to 1.2
> Gbytes:

I modified the program I wrote to use nc_put_varm_float rather than
nc_put_vara_float.  Performance still didn't degrade so the problem
doesn't appear to depend on which specific output function is invoked.

Regards,
Steve Emmerson   <http://www.unidata.ucar.edu>

• References:
  • Re: performance degrades with filesize
    • From: Russ Rew