nf_retry

This is a module that provides nf90_open_with_retries. This function wraps nf90_open with the following functionality

1. NetCDF errors are printed to the console
2. Automatically retry opening the file

This is useful for working around intermittent and erroneous i/o errors in HPC cluster filesystems like GPFS.

nf_retry is disabled by default and nf90_open_with_retries behaves exactly like nf90_open (except error are automatically printed). nf_retry can be enabled and configured by creating nf_retry.nml:

&nf_retry
    nf_retry_wait=1,            ! Seconds to wait before retry
    nf_retry_max_tries=3,       ! Max number of retries before failure
    nf_retry_catch=0,1,3,2,     ! NetCDF error codes to catch
    nf_retry_catch_all=F,       ! Catch all NetCDF errors?
/

Implementing nf_retry

Copy nf_retry.f90 into your source code and add include it in your build.

Include the nf_retry module and replace nf90_open calls with nf90_open_with_retries.

+  use nf_retry
   ...
-  status = nf90_open(path, mode, ncid)
+  status = nf90_open_with_retries(path, mode, ncid)