The following patches can be applied according to RHE's CVE:
In order to quantify the impact of the Spectre / Meltdown fixes a number of tests have been run. Unless otherwise stated all results are from the Fidis cluster.
If all the recommended fixes are applied then we see a large impact on IO. As computational kernels do not require frequent calls to the operating system the impact is far less significant.
Impact is a loss of about 50% aggregate bandwidth when running IOR with one MPI task-per-node.
Impact is much less visible when running IOR with 16 MPI tasks-per-node.
Situation of Fidis compute nodes after maintenance of January 24th, 2018:
Total running time in seconds on Fidis (lower is better)
Large test case. Steps per unit of time (higher is better)
Average time per iteration in seconds (lower is better)
SPEC points (higher is better)
espresso: version: 6.2.0 arch: platform: linux platform_os: rhel7 target: x86_E5v4_Mellanox compiler: name: intel version: 17.0.2 namespace: builtin parameters: elpa: true hdf5: false mpi: true openmp: false scalapack: true
|1m22.35s CPU 1m27.18s WALL||1m26.21s CPU 1m37.75s WALL|