Stampede2 hosts 4,200 KNL compute nodes, including 504 KNL nodes that were formerly configured as a Stampede1 sub-system.Įach of Stampede2's KNL nodes includes 96GB of traditional DDR4 Random Access Memory (RAM). Note that SKX nodes have their own queues. Hyperthreading is enabled: there are two hardware threads per core, for a total of 48 x 2 = 96 hardware threads per node. Stampede2's Skylake (SKX) compute nodes each have 48 cores on two sockets (24 cores/socket).See Best Known Practices… for more information. In most cases it's best to specify no more than 64-68 MPI tasks or independent processes per node, and 1-2 threads/core. But it may not be a good idea to use all 272 hardware threads simultaneously, and it's certainly not the first thing you should try. Stampede2's Knights Landing (KNL) compute nodes each have 68 cores, and each core has 4 hardware threads.
The charge rate for the SKX queues remains at 1 SU. In order to balance queue wait times, the charge rate for all KNL queues has been adjusted to 0.8 SUs per node-hour.See Intel 18 to Become New Default Compiler on Stampede2 for more information. The Intel 17 compiler and software stack are still available to those who load the appropriate modules explicitly.
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