Are you on 1.2 or 1.3 and are you sure you have JULIA_NUM_THREADS set properly?
@jebej I am on 1.3 and I have JULIA_NUM_THREADS set to 16:
julia> Threads.nthreads()
16
Neat. Why didn’t you use the fan that came with the CPU? Is the liquid one better, or just more silent?
@Tamas_Papp The case is very small so thermals were a big concern given that the AMD Ryzen 3000 series CPUs are notorious for running hot. It may not actually be necessary though as my idle temps are less than 40° C and even under heavy load it’s only getting up to around 70°. Nonetheless, it’s a simple all-in-one cooler (no liquid to add/maintain) so it’s not really any more difficult to install than a regular fan but provides much better cooling.
Regarding these performance results, I think @Elrod is on to something in his reply to a question I posted in another thread. He said:
Your CPU was mostly sitting, waiting for data. For every nanosecond it spent computing, there were 40 doing nothing…For memory bound operations, memory performance dominates.
It would be nice to come up with another measurement that’s less memory dependent.