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Scheduling Policy

Scheduling Policy. Andrew Sansum e-Science Centre, CCLRC-RAL Tier1 Board May 2004. So What Exactly is a Tier1 . Three(?) Levels of Scheduling External (GRID Level) Selection of destination by users Direction of work by RB Macro (Farm Level/Experiment)

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Scheduling Policy

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  1. Scheduling Policy Andrew Sansum e-Science Centre, CCLRC-RAL Tier1 Board May 2004

  2. So What Exactly is a Tier1 Three(?) Levels of Scheduling • External (GRID Level) • Selection of destination by users • Direction of work by RB • Macro (Farm Level/Experiment) • Deploy Hardware into appropriate infrastructure (eg Babar Tier A or LCG) • Meet target instantaneous shares and priorities set by EB • Problematic when multiple clusters • Micro (User Level) • Schedule individual jobs to meet Macro requirements • While (VERY IMPORTANT TOO): • Allowing newcomers to get rapid job starts • Prevent jobs running for too long hogging resources • While letting test work start for users even though production is running • Prioritising mission critical user ids • Preventing resources being underused • …. Moan moan moan moan  why doesn’t my job(s) start .. Why do THEY get more than me .. Tier1 Group

  3. EB Scheduling Policy (Macro Policy) • EB Reviews Quarterly • Will set “Target Allocation” of disk, CPU and Tape(?) • Function of Time (for example weekly) • Tier 1 will provide scheduling system (EG MAUI, PBS FIFO etc etc) • Departures from agreed priorities need agreement of EB chair. • EB will compare usage to allocation and require explanation of discrepancies • Load factor must exceed 70% Tier1 Group

  4. Issues Discussed • Request for ability for devolved responsibility to Tier 1 to make local short term urgent adjustments. Denied unless request is “small” need OK of EB chair. • Concern expressed by experiments that running at 70% plus load was not consistent with GRID development work they needed to carry out. Tier1 Group

  5. Farm Scheduling Status • MACRO • Run MAUI on Tier A – already control macro level allocations • Run PBS FIFO on LCG. Some capability to do macro level scheduling but rather limited. Currently testing. Otherwise could run Scalable PBS (provides MAUI) • MICRO • Not yet a problem on LCG – FIFO scheduler rather limited • Using MAUI on Tier A. No recent complaints, but Roger sceptical:“Current scheduling may not be optimal but it is not clear if a better solution exists”(C. Brew 2004) • MAUI rather complex and some strange features • Lack good objective scheduling metrics – may start “probing” regularly Tier1 Group

  6. OS Installation System • Deliverable in GRIDPP2 for deployment in December 2004 • Need something to operate LCG once Redhat Enteprise is deployed. • Have tested Quator for LCG community project (Steve).Given feedback on documentation. • Have a Quator installation (For EGEE JRA1 – which will use) • “Amazingly Complicated” Steve Traylen 2004!! • But if not Quator – then what. Quator still most likely candidate. Tier1 Group

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