On Wed, Jun 29, 2022 at 5:43 AM Stephen Morris <samor...@netsace.net.au> wrote:
> On 22/6/22 23:54, Matthew Miller wrote: > > [...] > > Or, `cpu-x` for a GUI view with a lot of detail. > Thanks Greg. I installed cpu-x and tried all the commands. What makes > the first two processes difficult from my perspective is the cpu I have > has 32 treads all of which are the same so the first two processes lists > all 32. > I ran the cpu-x bench marks for random numbers and what was interesting > was the results for 32 threads were only around 16 times the result for > 1 thread, which is probably to be expected given the cpu has 16 cores. > My experience was that disabling hyperthreading didn't reduce throughput. These multi-core systems generally do better with integer workloads, I think some have one f.p. unit per core. There can be very counterintuitive performance changes due to CPU cache issues and communications overhead. My experience is mostly with I/O intensive workloads. We generally found it best to limit those tasks to a fraction of the cores so background tasks (job control/monitoring, backups, etc) didn't stall. After a big effort to make efficient use of all the cores you may encounter thermal throttling. It was better to adjust the workload to avoid thermal issues: more consistent thruput and fewer issues with background tasks. -- George N. White III
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