Early X1 Experiences at Boeing. Jim Glidewell Information Technology Services Boeing Shared Services Group
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1 Early X1 Experiences at Boeing Jim Glidewell Information Technology Services Boeing Shared Services Group
2 Early X1 Experiences at Boeing HPC computing environment X1 configuration Hardware and OS Applications Support Summary Page 2 X1 Experiences - Cray User Group - May 2004
3 Current HPC systems Page 3 Two Cray T-90's A 384 CPU Origin 3800 Three 256-CPU Linux clusters Cray X1 X1 Experiences - Cray User Group - May 2004
4 Cray X1 Fully populated liquid-cooled chassis 64 MSPs 512 GB of memory, 32GB per node Additional Java Server Total of 26 terabytes of LSI RAID disk managed by ADIC StorNext software X1 is partitioned into two systems 14 nodes production partition 2 node test partition Allows testing of weekly OS updates Added additional complexity to network Page 4 X1 Experiences - Cray User Group - May 2004
5 Timeline Early Continuing discussions with Cray on X1 August Detailed plan for X1 transition September 19, Final approval for X1 acquisition November, Factory Visit January 2, System Delivered January 15, Early User Access March 1, Limited X1 Production March 8, Full X1 Production April 24, StorNext managed SAN put into production Page 5 X1 Experiences - Cray User Group - May 2004
6 Hardware experiences First system shipped with 32GB per node Memory errors seen at factory 1GB DIMMs were out of timing spec Cray developed new memory test to validate DIMMs Resulting in a one month delay in ship Fluorinert pumps Four of four pumps replaced One pump replaced twice, due to install error which ran it dry Bad batch has been identified by Cray CPU and memory reliability have been excellent Page 6 X1 Experiences - Cray User Group - May 2004
7 UNICOS/mp experiences System stability Data compare errors Administration and Operations Page 7 X1 Experiences - Cray User Group - May 2004
8 System Stability Kernel panics We've seen very few since start of production in March Application migration is still disabled Job aborts due to node memory oversubscription Overall the OS has been stable Exceeded our expectations of one kernel panic per week Improvements continue Page 8 X1 Experiences - Cray User Group - May 2004
9 Data compare errors Problems arose during acceptance testing of disks Errors were extremely infrequent (one failure every 72 hours of testing) Concerns about data integrity Cray dedicated multiple systems to replicating the problem Root cause was lack of "I/O cache coherency" I/O started before data was flushed from cache to memory DMA picked up stale data Problem resolved by ensuring all data flushed before writes Similar timing windows closed in other I/O related code Page 9 X1 Experiences - Cray User Group - May 2004
10 Administration and Operations Experience with IRIX really helpful Disk configuration & backups Network PBSPro Accounting Page 10 X1 Experiences - Cray User Group - May 2004
11 Disk configuration All disks are LSI RAID Complex Leaned heavily on Cray support Limited guidance on performance tuning Delayed StorNext managed SAN for months Backups Weekly backups to tape, daily disk to disk copies Long term plan to rely heavily on StorNext Page 11 X1 Experiences - Cray User Group - May 2004
12 Network Lots of components - X1, CNS, CPES, X1-JS, backup CNS Very complicated - hope nothing breaks! Page 12 X1 Experiences - Cray User Group - May 2004
13 Boeing X1 Nets PAM, RAID, StorNext StorNext X1 CNS0 Primary IP/FC <> X1 GbE <> CustomerNet.20 eth1 eth0.1 2 X1 CNS1 Backup IP/FC <> X1 GbE <> CustomerNet.21 eth1 eth0.2 1 IP/FC <> X1 X1 CNS2 Test.22 IP/FC <> X1 GbE <> CustomerNet.11 eth1 2 X1-JS znb0 ce3 eth StorNext FSS1 Alternate.21 eth2 eth1 FSS0 Primary eth2 eth eth eth0.2 ACSLS xxx.xx SNFS Net Addresses FSS FSS CPES X1-JS CNS 2 1 PAM IP/FC <> X1 /etc/hosts xxx.xxx on fss0 xxx.xxx on fss1 establishes cvfsid (license) and ACSLS client identity fsroutes on all nodes to redirect MD traffic to SNFS net.10 CPES znb0 ce3 switch0.private admin.2 PAM PAM SFM1.11 Ethernet SFM0.10 Ethernet CWS znb5 RAID PAM znb6 RAID Page 13 X1 Experiences - Cray User Group - May 2004
14 PBSPro Solid and reliable for us Excellent documentation User documentation needed (What's an MPPE?) Good interaction with psched But PBS knows nothing about flexible vs. accelerated mode Disabled migration can leave applications stuck in posted queue Expect improvements at 2.4 Page 14 X1 Experiences - Cray User Group - May 2004
15 Accounting No Cray System Accounting... But project accounting is supported Using a locally written program to sum usage by user, project Session id will be included in UNICOS 2.4 process records Page 15 X1 Experiences - Cray User Group - May 2004
16 Applications and Tuning Compilation time is still an issue Cray has provided significant help in getting our key applications performing well on the X1 Overflow Tranair Other applications Page 16 X1 Experiences - Cray User Group - May 2004
17 Overflow CFD code developed at NASA Ames Parallel CFD code using MLP (Multi-Level Parallelism) Scales well to large number of nodes (256 or more) Runs very well on our NUMA-based system Initial performance was roughly 16X that of a 400Mhz CPU on our existing Overflow system After tuning by Cray personnel, performance is now 25X Code changes have been integrated to NASA's version Page 17 X1 Experiences - Cray User Group - May 2004
18 Tranair Boeing developed CFD code Adaptive grid single-cpu FORTRAN code Out-of-core solver - made heavy use of SSD on T-90s Highly optimized for T-90 series Large memory requirement GB per job, desire larger Forced to use MSP mode due to memory needs Initial speed ratio was relative to T-90, both MSP and SSP Current MSP speed ratio is 2.0 times the speed of T-90 Page 18 X1 Experiences - Cray User Group - May 2004
19 Support Cray has provided excellent support throughout the process Initial hardware and software setup Local technical support Technical folks in Chippewa Falls and Mendota Hardware resources to reproduce and debug problems Excellent training & documentation Cray s assistance was essential in the success of our installation on a very aggressive schedule Page 19 X1 Experiences - Cray User Group - May 2004
20 Summary Significant hardware and software issues were encountered and resolved Memory DIMM problems Data compare errors Kernel panics StorNext teething pains Cray has provided great support throughout the process Users are happy with the turnaround and overall reliability of the X1 The X1 is already a key part of our CFD design process Page 20 X1 Experiences - Cray User Group - May 2004
21 Coming soon Page 21 X1 Experiences - Cray User Group - May 2004
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