CDAS/Reanalysis Project started running on a CRAY Y/MP. Later,
we moved to a CRAY J16. Now, our CRAY J's have been removed and
have been replaced by an IBM SP/2. The conversion to the
IBM was a major conversion as one might expect.
The CDAS/Reanalysis conversion was tested by running the systems on
both the Cray and IBM SP/2. For the final test, the systems were run
for a month and the output were compared. After successful testing,
we started running on the IBM SP/2 version starting with
the May 1, 2000 analysis.
Changes
- all cos-blocked files will have f77-style blocking
- all ibm-mainframe (S370) binary numbers will be replaced by
single precision IEEE numbers
- 64-bit binary cray integers will replaced by 4-byte integers
- bufr files will no longer have the deviation from climatology
(The climatology is not useful as it predates Reanalysis.)
- dgn.* (monthly mean 3d flux files) will have more variables
- optimal averaging will be discontinued
- grib files will have f77-style headers. (The headers speed
up processing and are ignored by grib decoders.)
- SSI will run in single-processor mode (not multi-threaded).
The SSI uses data differently depending on the order of the
input, and the order is indeterminate with multi-threading,
- GRIB scaling factors of the covariances will be changed.
- the znl files will use f77 blocking and real*8 data
- updated optimal interpolation quality control table
(should have
been done earlier)
- Rotating Archives:
sanl files (spectral sigma files) are now available
- Rotating Archives:
pgb files now have specific humidity, velocity
potential,
stream function, divergence and relative vorticity
(of course
the records have a different numerical order).
- Rotating Archives:
grb2d files now have total cloud cover (of course
the records have a different numerical order).
Benefits of the Conversion
- The source code to the various post-processors (spectral->pgb,
spectral->sigma grid, spectral->isentropic) have been made
portable. The w3lib grib routines are also portable. Source
code is or will be made available upon request.
- The reanalysis forecast model is more-or-less portable. A linux
(g77) version is possible.
- The rotating archive will have more variables.
- CDAS will run when the Crays are decommissioned.
All comments should be should be sent to Wesley.Ebisuzaki@noaa.gov.
back
comments: Wesley.Ebisuzaki@noaa.gov
Privacy Policy