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J׊)tT՗!sePSZ cV/[V*#M/6o4zL=1d"՜F}e2ٲaLQsX*4@d:I,_FKٶS]*E3$WdS$kHmi&bQʓU0IvW~!?a5.v&F#V2>Tm I+=MR2|hcYܱDvlxKr&W6-/ÓKFbl\e}Ȇ/c`O?\^WHΪrry ޘUbWY&iɀa' CCQ"1;mA } w-#Ͳ&QhfcDBS6s<3h.@$_$_"$vѢ&Er/ _$_$_b$J# #gЄ:[4_ 0AA3@ʚ;ʚ;g4KdKd )0ppp@ <4dddd 0DhA <4!d!dy 0D<4BdBdy 0D*0___PPT10 ___PPT9`4?Z,June 6, 2007 &TG07 - June 6, 2007O  =)! $Adapting an Application for Use in a Condor Based Parameter Sweep on Teragrid P. A. Cheeseman (aai@purdue.edu) M. W. Deem (mwdeem@rice.edu) D. J. Earl (dearl@pitt.edu) William I. Whitson (wiw@purdue.edu) Teragrid Allocations TG-MCA05S015 (exp. 2007/03/31) TG-MCA05T015 (exp. 2007/03/31)6%N?~W" Acknowledgements Preston Smith (psmith@purdue.edu) Caretaker of all things Condor at Purdue, 24/7. Rosen Center for Advanced Computing Staff (rcac-ticket@purdue.edu) Caretakers of all things hardware and software at Purdue, 24/7.`#/C@t"^B3& VGoal of Computation. Identify potentially new Zeolites by searching through all crystallographic space for hypothetically stable structures. Zeolites employed in industry as catalysts, molecular sieves, and ion exchange resins. Employs Monte Carlo method. Ref: D. J. Earl and M. W. Deem,  Toward a Database of Hypothetical Zeolite Structures , Eduardo Glandt Special Issue, invited, Ind. & Eng. Chem. Res., 45 (2006) 5449-5454.Nj>.WF 3Initial observations Single seed (cycle) per load of program. One 20-25Kb text result file per cycle. 100 cycles executed per parameter set. Average time per set observed to be 2-3 hours. Compute times per set varied widely. No abnormal terminations due to code. Initial live data base (group) of 6707 sets.(2(2 = u     Purdue Condor Pool Preemptive scavenging and scheduling system. Backfills several PBS administered platforms. Uses idle processors (opportunistic). Preemption virtually certain for 1+ hour jobs. Heterogeneous Linux and processor versions. Static links performed regardless of universe. Practical potential of 1000+ machines usable. 2700+ Linux, 2300+ Windows systems  today . Net I/O level could have bearing on number of jobs to maintain in execution (previous experience).Z[Z&3Z/Z,Z/3Z.Z,ZcZB&3/  3, /3.,c lImmediate Activities Created execution script to ... Track execution time to detect runaways and terminate gracefully. Recover from failures by restart after last complete cycle. Perform all cycles per set. Required a single program change to place termination message on result files. Mandated submission to vanilla universe. Increased cost on execution machine.8Z2 8Z2ZN3ZM33%3 Immediate Activities Created steward procedures to control job flow. Strip mine group tar files in batches to hold sets actually on disk to 6000-8000. Cap number of jobs in queue to practical maximum w.r.t. system capabilities. Dynamically adjust cap to hold percentage of jobs executing to 80-90% of total in queue. Identify completed sets and package results. Increased load on submission platform.(20Y-'3Y-'3# RIntermediate Activities/Observations Sets per group would exceed 30,000. Tweaks to procedures continued with job flow. Fault tolerance. Times per cycle could vary significantly. Very high eviction rates (Condor job restarts per batch) observed frequently for groups with long average job times. Condorizing the program became desirable.l%S+%S    )  $ ZCondorizing the program. Eliminate need for execution script. Incorporate cycle loop within program. Incorporate self checkpoint. Incorporate timing controls. Add capability to process multiple sets. Deal with contingencies created by modification. Written plan document circulated to all concerned. Significant work deserves significant thought.%aZ3" 3/" 3%aZ33/  3 P& After Condorizing. Job duration under reasonable control. Easily adaptable to other batch systems. Either universe usable under Condor.  Short jobs if running in vanilla universe.  Long jobs if running in standard universe. Short/long differentiated by vanilla eviction rate. Continued with vanilla universe to retain use of Intel compiler suite and to minimize I/O load on submission host. |'Ns'Ns   y   .#' dProject Summary as of 2007/02. 1,700,000+ sets processed (3,000,000+ jobs). 85% of TG sets. Included post-analysis to aid throughput. 2,300,000 hours  officially delivered to the project. ~250 CPU hours per hour elapsed since 2006/02. 3.5 million structures cataloged (as of 2007/06). Collaboration continues using renewal allocation. Approximately 1.2 million sets remaining. Ref: http://www.hypotheticalzeolites.net/DATABASE/DEEM/ -:7/-:7/ 3  * The End (for now)  WCondor Notes Standard Universe Most desirable due to checkpoint capability. No sub-processes. Scripts cannot be used as executables. Must link with Condor run-time library. Static links only. Use of Intel compilers not possible. Relative size of executable increased ~500% for this application to 5+ Mb. Eviction (job restart) can still occur. ?'3;p3( ?'3; p  3&     Condor Notes Vanilla Universe Preemption by suspension or eviction only. Self checkpoint absolutely necessary for long jobs where long is a characteristic of the Condor pool. Scripts may be used as executables. Condor run-time not required. +f3B +933)3B What we didn t know. Ultimate size of entire project. Number of groups were known. Number of sets per group not completely known. Whether early and intermediate observations were representative of entire project.X!LS!LR  ` 33` Sf3f` 33g` f` www3PP` ZXdbmo` \ғ3y`Ӣ` 3f3ff` 3f3FKf` hk]wwwfܹ` ff>>\`Y{ff` R>&- {p_/̴>?" dd@~?" dd@   @ ` n?" dd@   @@``PR    @ ` ` p>> vn(  $  0y " `  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     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