Group Computing StrategyIntroduction and BaBar

Roger Barlow

June 28th 2005

Linux PCs

list from

Stuart.

Linux Non-Server Desktop Hosts on LAN 194.36.2

Jun-05

Host Primary Service CPU Memory MB LocationWorkstation OS Type GHz Spec2000 No.

PC27 Yes ? ? ? ? ? ?PC33 Yes RH 7.3 AMD Duron 1.1 ? 256 7th FloorPC38 Yes SL 3.2 AMD Sempron 1.8 ? 512 7th FloorPC42 Yes RH 7.3 Pentium II 0.3 ? 64 7th FloorPC51 Yes RH 7.3 Pentium III 0.45 ? 128 5th FloorPC52 Yes SL 3 AMD Athlon XP 1.8 ? 512 5th FloorPC53 Yes RH 7.3 Pentium III 0.45 ? 128 7th FloorPC54 Yes RH 7.3 Pentium IV 1.5 ? 128 7th FloorPC55 Yes RH 7.3 Pentium III 0.45 ? 128 5th FloorPC56 Yes RH 7.3 AMD Athlon XP 1.8 ? 512 7th FloorPC57 Yes SL 3.2 AMD Sempron 1.8 ? 512 7th FloorPC58 Yes ? ? ? ? ? ?PC62 Yes RH 7.3 AMD Athlon 1 ? 128 7th FloorPC69 Yes RH 7.3 AMD Athlon XP 1.8 ? 512 7th FloorPC70 Yes SL 3.2 AMD Sempron 1.8 ? 512 7th FloorPC71 Yes RH 7.3 Pentium III 0.45 ? 128 5th FloorPC72 Yes ? ? ? ? ? ?PC76 Yes RH 7.3 AMD Athlon XP 1.6 ? 512 7th FloorPC77 Yes RH 7.3 AMD Athlon XP 1.6 ? 512 7th FloorPC82 Yes SL 3.2 AMD Athlon XP 1.6 ? 512 7th FloorPC83 Yes ? ? ? ? ? ?PC84 Yes RH 7.3 AMD Athlon XP 1.6 ? 512 7th FloorPC86 Yes RH 7.3 Pentium III 0.55 ? 128 7th FloorPC87 Yes RH 7.3 Pentium III 0.55 ? 128 5th FloorPC95 Yes RH 7.3 Pentium III 0.8 ? 256 7th FloorPC96 Yes SL 3.2 AMD Sempron 1.8 ? 512 7th FloorPC97 Yes SL 3.2 AMD Sempron 1.8 ? 512 7th Floor

Windows PCs

Windows Dedicated or Dual Boot Desktop Hosts on LAN 194.36.2

Jun-05Most Windows machines use the DHCP server for their ipaddress.

Ident Primary Service CPU Memory MBLocation Age monthsDisk size GBIpaddress OS Type GHz Spec2000 No.

PublicPC1 DHCP WinXP SP2AMD Duron 1.1 ? 384 5th Floor Res 36 60PublicPC2 DHCP WinXP SP2AMD Athlon 1 ? 512 5th Floor Res 36 80PublicPC3 DHCP WinXP SP2AMD Duron 1.11 ? 384 5th Floor Res 36 40PublicPC4 194.36.2.218WinXP SP2Pentium III 0.45 ? 128 5th Floor Res 36 20ProjectPC5130.88.8.183WinXP SP2Pentium III 0.334 ? 128 5th Floor Res 36 30PublicPC6 DHCP WinXP SP2Pentium III 0.548 ? 384 5th Floor Res 36 6StuartsPC DHCP WinXP SP2AMD Athlon XP 1.8 ? 512 5.14b 6 40

120JuliansPC DHCP WinXP SP2AMD Athlon XP 1.8 ? 512 5.14b 24 80RaysPC DHCP Win2000 SP3AMD Athlon XP 2 ? 512 5.31 24 20FredsPC DHCP Win2000 SP4Pentium IV 1.7 ? 256 5.5 24 30GeorgesPCDHCP Win2000 SP4/LinuxPentium IV 1.7 ? 256 5.9 36 30FlorenesPCDHCP WinXP SP2AMD Athlon XP 2.08 ? 512 5.11 12 160AndysPC DHCP WinXP SP2Pentium III 1 ? 256 5.16 48 40IansPC 194.36.2.138WinXP SP2/SL 2.4AMD Athlon XP 1.67 ? 512 5.1 24 60

2020

ModtestPCDHCP Win2000 SP4Cirix? 0.5 ? 256 5.15 48 10ModdbPC DHCP Win2000 SP4AMD Athlon XP 1.8 ? 512 5.15 24 80VidConfPC130.88.8.152WinXP SP2AMD Duron 1.29 ? 512 HEP Boardroom 24 40LibraryPC DHCP Win2000 SP3AMD Athlon XP 1.67 ? 512 7th Floor Library 24 40AdamsPC ? Win2000 ? ? ? ? 7.1 36 ?

KEY:OS = Operating SystemSL = Scientific Linux

And we have

• afs server

• Disk server

• BaBar farm

• DØ farm

• Grid farm(s)

• Macintosh farm

• Various laptops

This is not a strategy

“57 varieties” computing architecture leads to inefficient use of

• CPU

• Disk space

• System manager time

• User time

Coming soon: the Tier2 centre

2000 2.8 GHz CPUs500 Tb of disk

We have to share it – but we can give ourselves priority

Why do we want anything else?(Rhetorical question)

BaBar Analysis

Event Data

Large (Tb) ntuples

Small (Gb) ntuples

Final plots

Tier 2 farm

Local cluster

This assumes the Grid is working so we can all use it

But it must!

3 layer model

• Tier 2 centre. Batch processing.

• Local cluster. Powerful interactive facility and some storage. Used for compiling, linking, test jobs and final analysis.

• Desktop/laptop. Nice display. Connect to cluster (ssh, eXceed…) for anything intensive.

Not a new idea! What SLAC and CERN do…

Points towards a strategy• We want a group cluster. Not separate ATLAS and

BaBar and DØ and SuperNEMO and Accelerator Science… clusters.

• Assemble and maintain ~15 high performance nodes as HEP cluster. Run lcg and SL3. (Migrate as needed) These are inside the firewall.

• The BaBar and DØ farms will wither away• Little (or no) need for more data servers• Everyone gets a desktop or a laptop. Linux desktop or

PC? Macintosh? lcg UI? “Pretty but not powerful”

So we…

Think and discuss

Have another meeting in about a month (ask John Baines?)

Keep September 21st free