On 29/6/22 21:29, George N. White III wrote:
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.
Thanks George, I have experienced the same things myself. Having
installed cpu-x for the first time I was just trying it out, and it
default benchmark mode was 1 minute and 1 thread with slow random number
generation and fast random number generation, I haven't done any
investigation to determine exactly what that means. So a ran a test on
the default setting, then ran a test on 32 threads which returned a
result that was around 16 times the results from a single thread. Which
I was not surprised at as being a 16 core dual channel cpu, and hence
Windows and Fedora consider it to have 32 logical cores, it doesn't
matter how many channel are available for each core the total throughput
is only what a core is capable of producing.
regards,
Steve
--
George N. White III
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