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Measurements of Version 3.0 (Beta) RELAP5-3D

Measurements of Version 3.0 (Beta) RELAP5-3D. RELAP5-3D International Users Seminar 2010. Sep 20-23, 2010. [insert optional photo(s) here]. Outline. Static Measures Improvements to the 3D capability in RELAP5-3D Dynamic Measures. Static and Dynamic Measures. Dynamic Measures

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Measurements of Version 3.0 (Beta) RELAP5-3D

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  1. Measurements of Version 3.0 (Beta) RELAP5-3D RELAP5-3D International Users Seminar 2010 Sep 20-23, 2010 [insert optional photo(s) here]

  2. Outline • Static Measures • Improvements to the 3D capability in RELAP5-3D • Dynamic Measures

  3. Static and Dynamic Measures • Dynamic Measures • Metrics that are obtained when the code is run • Coverage analysis, profiling, run speed, etc • Static measures • Metrics that apply to the code when it is not running • Code structure, features, user problems, etc.

  4. Feature Comparison 2.4 and Beta (3.0) • Downgrades

  5. Feature Comparison 2.4 and Beta (3.0) • Upgrades • * These are reported in another presentation

  6. Feature Comparison 2.4 and Beta (3.0) • Upgrades

  7. Spaghetti Code to Structured Code • Spaghetti Code is code that is hard to read because • Tangled (interwoven) logic paths. Symptom: go-to’s and line labels • Knots (backward jumps). Symptom: backward go to. • Obscure coding (multiple-return, assign-stmt, computed go to, etc.) • Lacks consistent indentation and other helpful programming style • Spaghetti code is considered bad practice • Prone to experience errors, • Cause of errors are difficult to locate

  8. Improvement: Restructured Code • Computer Science solution – Apply structured programming • Commercial restructuring package applied (between 2.4 and 3.0) • Workaround for pre-compiler directives was created • Restructurer actions • Eliminate go-to statements • Pull sections of code together • Enforce consistent style • Eliminate dead code w/in subroutines

  9. Static Measure: Readability measures • Reduction of GOTO statements • Lines of code: 249400 (2.4.1.2), 278100 (3.0.0) • Source code files: 554 (2.4.1.2), 630 (3.0.0) 05-GA

  10. Static Measure: Line Label Reduction 05-GA

  11. Static Measure (Spaghetti) – McCabe Index • McCabe Cyclomatic index = industry-standard, code-complexity measure. • Number of independent linear paths through code • Indicates the number of branches within it. • Higher indices => more branches => harder to maintain. • Cyclomatic index of 100 or less is generally considered low complexity and good programming • Only input processing subroutines have 100+ index

  12. Static Measures: Nesting and Documentation • Nesting is containment of one programming structure (loop, select, or sequence) within another • Nesting level is the number of such structures containing a block of code • Less nesting is generally easier read and maintain • Internal documentation (comments) improves readability • Documentation was added. Guidelines were applied.

  13. Static Measure: User Problems Solved

  14. Dynamic Measure: Coverage Analysis • Betacode is much more heavily tested • Beta code’s test suite covers a much higher percentage of files and statements • Reduces the likelihood of error

  15. Improvements to 3D Capability of RELAP5-3D • Viscosity terms for Cartesian and Cylindrical Coordinates, SI • Beta Version 3.0.0: Liquid momentum equations, 2009 • Version 3.0.1: Gas momentum equations, 2010 • Version 3.0.1: Simple turbulence term, 2010 • Would like more grid cells for good turbulence modeling • Want more 3D volumes for many modeling purposes • Version 2.4 had many 3D restrictions • Could receive message:“Too many parallel connections” • E.G. Code stops with that message on a 6x6x6 region. • 2400 junctions upper limit • 999 volumes upper limit

  16. Improvements to 3D of RELAP5-3D (cont.) • Eliminated 3D Limits in Beta and post-Beta • Beta Version 3.0.0: “Parallel connections” overcome by allocation • Version 3.0.1: 2400 junction limit overcome by allocating • Version 3.0.1: 999 (artificial) volume limit removed • Up to 9x99x99 volumes possible • Enough for many modeling needs • Version 2.4 solvers too limited for these large regions • Ver. 2.4 Original default solver, MA-18, too slow • PGMRES is faster but had its own hard-coded size limits • Ver. 2.4 default solver, BPLU, limited by size of FA array • Version 3.0.0 removes hard-coded and FA size restrictions

  17. Dynamic Measure: R5-3D Times on 3D-Region SI • Cylindrical 3D region from Loft L2-5 Test • 100 Advancements with Semi ImplicitMethod • Full multi-D (cross derivative terms included) • Whole code transient CPU time with solvers PGMRES and BPLU • Platform: Sun AMD Opteron, Open Suse 11.2, ifort 10.1 MA18 Times 8x8x5 2233.7 8x8x8 17529. 8x8x10 47527. 8x8x13 85430. Too slow!

  18. Dynamic Measure: R5-3D 3D-Regions Times - NI

  19. Dynamic Measures: Grind time • Grind time is average time taken for one advancement. • Non-solver RELAP5-3D operations could obscure the solver times.

  20. Dynamic Measure: R5-3D Solver Clock Cycles NI • BPLU time is O(n), PGMRES time is O(n2) as n increases.

  21. Conclusions Upside of Beta version vs. version 2.4 • Beta version 3.0 has many new features. • Beta version expands memory to fit user’s model. • Beta version has virtually no spaghetti coding • Beta version of RELAP5-3D has much improved 3D capability • Beta version has very efficient solvers for 3D regions Downside • RGUI mostly unavailable • Support fewer compilers

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