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RELAP5-3D in Fortran 90 Dr. George L Mesina RELAP5 International Users Seminar Nov 18-20, 2008 Idaho Falls, ID Overview High-level description of conversion Database & executable code conversion Effect of conversion on users and development Current status

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relap5 3d in fortran 90

RELAP5-3D in Fortran 90

Dr. George L Mesina

RELAP5 International Users Seminar

Nov 18-20, 2008

Idaho Falls, ID

overview
Overview
  • High-level description of conversion
  • Database & executable code conversion
  • Effect of conversion on users and development
  • Current status
  • Alpha version tentative release schedule
  • Summary
f90 project high level description
F90 Project High-Level Description
  • Like working on the Winchester House
the winchester house
The Winchester House
  • Sarah Winchester, heir to Winchester Gun Fortune, built the Winchester Mansion until 1922.
    • Believed she couldn’t die while house under construction.
    • Builders worked 24 hours/day, every day, for 38 years.
    • Room elevations vary within a story, stairs cross stories or lead nowhere, doors open into walls, etc.
  • Registered as California Historical Landmark with the National Park Service as "a large, odd dwelling with an unknown number of rooms.“
    • First count: 140 rooms, later counts: up to 160.
winchester house
Winchester House
  • Floor plan developed daily as needed. No overarching plan.
  • So convoluted, people got lost. Like a 3D maze.
  • Despite construction and labyrinth, Sarah entertained visitors and gave tours.
relap5 winchester f90 analogy
RELAP5-Winchester F90 Analogy
  • RELAP5-3D had a maze-like floor plan (database)
  • has a huge number of rooms (subroutines)
  • with ongoing construction (by code developers)
  • and visitors and tours (users, code usage)
  • Riemke Repairs Davis Doors Weaver Windows
  • Excavator Ed Fisher Fascia Judd Additions Nestle Nooks
the winchester fortran 90 analogy
The Winchester Fortran 90 Analogy
  • Fortran 90 Project is analogous to:
    • Replace ALL plumbing & wiring (convert to F90)
    • Without affecting the work crews (developers)
    • Or impacting the owner (users)
fortran 90 other objectives
Fortran 90 Other Objectives
  • Decomplexify the 3D labyrinth into a clear floor plan. Translation – Make an elegantly simple database.
  • Fix long-standing problems left by previous builders Translation – Solve some User Trouble Reports.
  • Don’t slow down anyone else’s work Translation – Don’t impact code runtime
  • When done, every room left exactly as before Translation – ALL test problems must work with no changes to the calculations
  • Sound like a job you’d want?
why convert to fortran 90
Why Convert to Fortran 90?
  • Numerous advantages to users
    • Listed later in presentation
  • Easier to read and develop
    • Better for V&V
    • Reduced maintenance costs
  • Increase code longevity
decomplexifying the database
Decomplexifying the Database
  • Eliminate all equivalence statements
    • These create multiple names for a

single memory location

    • Accidental data destruction
    • Real equivalent-to integer created

severe complications

  • Derived type arrays organize the data w/in a group
decomplexifying the database11
Decomplexifying the Database
  • Example: original component database
    • Number of components
    • Data common to all components
    • Index array of component start indices
    • Variable length component data stored

contiguouslyOR a “referral” index

      • Problems: correct indexing, overruns
  • Derived types and sub-derived types simplify data grouping and accessing
decomplexifying the database12
Decomplexifying the Database
  • Convert comdecks to modules with:

1. Derived type and other data

2. Data dictionary and other

documentation within file

3. Service subroutines process

module’s data

      • Constructors and Destructors
      • Restart Read and Write
      • Some have other auxiliary routines
converting source code
Converting Source Code
  • Major aspects of conversion - Declarations
    • Modules replace COMDECKS for data access.
    • Introduction of derived types to organize data into efficient and logical data groupings.
    • Declarations with “universal” numeric types to reduce numeric precision problems.
    • Elimination of real-to-integer equivalences.
converting source code14
Converting Source Code
  • Major aspects – Executable Code
    • Internal subroutines used to simplify code
    • Restart controlled by subroutines dedicated to a group of data rather than entire database.
    • Fortran 90 pointers introduced
    • Case and multi-else if-statements introduced
    • Array processing replaces loops in places
  • Complete rewrites of some subroutines.
converting source code15
Converting Source Code
  • Fortran conversion - Statements
    • Obsolescent coding eliminated or replaced.
    • Machine dependent coding replaced by Fortran 90 intrinsic functions and subroutines.
    • IF-THEN and IF-THEN-ELSE constructs replace most “GO TO” statements.
    • ENDDO and ENDIF replace most CONTINUE statements
    • USE statements replace INCLUDE statements
converting source code16
Converting Source Code
  • Derived type references replace FA-

equivalent arrays.

  • Ordinal indexing replace fa-indices, simplifies loops.
  • Fortran 90 pointers replace fa-index based pointers, greatly simplifies pointers.
user advantages
User Advantages
  • Machine independent plot file
    • Can write a plot file on a Windows or Linux platform with any chip
    • After binary transfer, can use file to make plots on any other such platform
  • Self-sizing memory
    • No longer will your code run out of memory before your machine does.
    • Memory is allocated according to the size requirements of your input
user advantages18
User Advantages
  • Some previously unrecognized problems corrected
    • For example, time-step lower limit enforced.
    • PVM multiple-RHS limit with BPLU solver fixed.
  • Source Code Users
    • Can now read and understand code better
    • Simpler to add new data to database and program data services
    • Simpler to add new code that uses new or old data
    • Documentation easier to find and read
user advantages19
User Advantages
  • Longevity
    • Obsolete and machine-specific coding removed
    • Adjusting code to new machine chips and operating systems simpler in F90
    • Easier to train new team members (even if they only know C++ or Java but not Fortran)
    • The code will last
features not currently available
Features not currently available
  • RGUI – RELAP5-3D Graphical User Interface
    • Used to show transient calculations in 3D and color, to make movies of the screen display, etc.
    • Conversion postponed
  • The following will not be converted
    • Severe Core Damage Model coding (SCDAP)
    • IAEA Graphical User Interface
    • Nuclear Plant Analyzer
status of current version 2 8 3
Status of Current Version 2.8.3
  • An INL internal version created Nov 1, 2008
  • Converted => do not reference Fortran77 database.
    • 81% of all 643 “relap” files
    • 100% of 135 “envrl” files
  • Transient semi-implicit solution fully converted
  • V2.8.3 Runs all previous test cases and new ones.
    • Answers same as earlier version except where modified for code physics developments or bug fixes
status of current version 2 8 322
Status of Current Version 2.8.3
  • - INL internal version, Nov 1, 2008
    • Code speed affected by remaining transfers
      • Slowdown = Time(v2.8.3) / Time(v2.4.1.2) – 1
        • tank.i = 0%, typp12002.i = 36%
        • worst case: pb_ss_air.i – 133%
      • Most transfers are in syssol.F.
    • Plan to eliminate all transfers and regain virtually all speed.
tentative development release schedule
Tentative Development/Release Schedule
  • Version 2.8.3 - INL internal version, 11/08
    • Transient semi-implicit solution free of FA array
  • Version 2.8.4 - INL planned internal version, 12/08
    • Transient free of FA array
  • Version 2.8.5 - INL planned internal version, 1/09
    • Fortran 90 conversion complete
  • Version 2.9.0 – tentative external release, 2/09
    • ALPHA version
    • Will run all previous test cases and new ones.
thanks to f90 project contributors
Thanks to F90 Project Contributors
  • Dr George Mesina: PI
  • Dr. Richard Riemke
  • Nolan Anderson
  • Hope Forsman
  • Richard Moore
  • Dr. Paul Murray
  • Consultants: Richard Wagner, Dr. Walt Weaver
  • Summer students: Joshua Hykes, Riley Cumberland