Last updated (45:00pm AEDT)
This page provides information to help users prepare for the transition from Raijin to Gadi in 2019 Q4.
User Environment: Compilers and MPI
|Intel MPI||2018.3.222, 2019.3.199|
|OpenMPI||2.1.6, 3.0.4, 3.1.4, 4.0.1|
NCI plans to provide version OpenMPI 4.0.2 at the time of Gadi pre-production, subject to testing and validation.
Processor Comparison: Raijin vs Gadi
|Intel Xeon E5-2670 (Sandy Bridge)||Intel Xeon Platinum 8274 (Cascade Lake)|
|Two physical processors per node|
Two physical processors per node
|2.6 GHz clock speed||3.2 GHz clock speed|
|16 cores per node||48 cores per node|
332 GFLOPs per node
|4915 GFLOPs per node|
The computing charge rate on Gadi is 2.0 service units (SU) per cpu-hour. This rate broadly reflects Gadi's performance relative to Raijin.
Broadwell and SkyLake nodes are expected to be offline for three working days in November when they are migrated to Gadi. Users who rely on Broadwell or SkyLake nodes should prepare for approximately three (3) days of downtime in late November. Unfortunately a testing/pre-production period will not be available to Broadwell and SkyLake workflows.
Job Charging - Examples
Gadi Cascade Lake node = 48 CPUs, 192 GB memory
1 cpu-hour = 2 service units (SU)
|Normal||4||16 GB||5 hours||4 x 5 x 2 = 40 SU||Satisfies 1 CPU <= 4 GB memory.|
|Normal||8||16 GB||5 hours||8 x 5 x 2 = 80 SU||CPU request dominates.|
|Normal||8||128 GB||5 hours||32 x 5 x 2 = 320 SU||Memory request dominates.|
32 cpus is proportion of node resources.
|Normal||8||192 GB||5 hours||48 x 5 x 2 = 480 SU||Memory request dominates.|
192GB = 100% of node memory.
|Express||8||16 GB||5 hours||8 x 5 x 2 x 3 = 240 SU||CPU request dominates (as above).|
Express multiplier is x3.
NCI strongly recommends that all users recompile their applications to obtain optimum performance and compatibility with the Gadi run-time environment.
More comprehensive updates on VDI will be provided to users in January-February 2020. If you have specific questions or concerns about VDI please contact NCI User Support - email@example.com.
If you have further questions or concerns about the transition from Raijin to Gadi please contact NCI user support at firstname.lastname@example.org.