Re: [Beowulf] Tiered RAM

2018-09-25 Thread Jeff Johnson
John, Did you see this? https://www.anandtech.com/show/12828/intel-launches-optane-dimms-up-to-512gb-apache-pass-is-here It's the DDR4 compatible DIMM slot version of Optane as persistent memory. I have a set of Diablo DIMMs still. These are supposed to act in the same general way. Livable speeds

[Beowulf] Tiered RAM

2018-09-25 Thread John Hearns via Beowulf
Over on the SLURM list we recently had a very good discussion on swap space and job suspension. I commented that for large memory systems we should be seeing tiered RAM devices by now. I had a look at the Intel pages on Optane memory. It is definitely being positioned as a fast file cache, ie for

Re: [Beowulf] SIMD exception kernel panic on Skylake-EP triggered by OpenFOAM?

2018-09-25 Thread Christopher Samuel
On 10/09/18 11:16, Joe Landman wrote: If you have dumps from the crash, you could load them up in the debugger. Would be the most accurate route to determine why that was triggered. Thanks Joe, after a bit of experimentation we've now successfully got a crash dump. It seems to confirm what I