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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 l.jpg

RELAP5-3D in Fortran 90

Dr. George L Mesina

RELAP5 International Users Seminar

Nov 18-20, 2008

Idaho Falls, ID


Overview l.jpg
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 l.jpg
F90 Project High-Level Description

  • Like working on the Winchester House


The winchester house l.jpg
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 l.jpg
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.


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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


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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)


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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?


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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


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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


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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 l.jpg
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


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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.


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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.


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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


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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.


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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


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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


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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


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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


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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


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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.


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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.


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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


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