When is HyperThreading NOT beneficial to the user?

[waffleironhead]

The primegrid llr app does not do well with ht. From my experience you more than double the time each item completes. You either need to disable ht or tell boinc to only run on half the available cores.

 

[coercitiv]

I fixed the slowdown in minimizing / restoring my windows, by telling BOINC to only run one two cores (threads) instead of three.

Out of curiosity, could you try another setting as well? Four threads instead of two, but lower max cpu utilization a bit.

 

[VirtualLarry]

Out of curiosity, could you try another setting as well? Four threads instead of two, but lower max cpu utilization a bit.

Well, I've largely switched over from PrimeGrid to NumberFields on that box now, but I tried setting it to use 100% of processors (all four threads), and 90% CPU usage.

Now, it doesn't actually hold the CPU usage at 90%, it kind of modulates it, and I see it skipping between 1%, 30%, 60%, and 100% fairly regularly.

Regardless, my window minimization doesn't seem to be affected any more.

Edit: I guess I ran out of GPU compute WUs too.

 

[Charlie98]

When is HT not beneficial...running Linpack?

You ain't lying! I ran 3 passes of LinX on the i3-powered HTPC and the differences were significant.

Why is that?