2020 Prime95 observations, issues, and suggestions

[Happy5214]

Originally Posted by storm5510

I do not know what Windows 10 calls this. Windows 7 calls it "Linux on Windows." I experimented with it briefly, but never ran anything significant on it. It seems like the Windows 10 baggage would reduce the performance of anything running this way.

I'd have to imagine adding another layer in the middle would slow it down further,

[storm5510]

Originally Posted by Prime95

In case anyone is wondering, I have no objections to a community run Facebook page. Are there several volunteers willing to give it a go?

I tried looking at the page, but Facebook kept popping up a screen every 5 seconds asking if I want to create an account. Apparently "no" is not the answer they were looking for...

I have an account which I use to keep up with relatives, old schoolmates, and past coworkers. The vast majority of it is junk.

[Happy5214]

Originally Posted by Prime95

In case anyone is wondering, I have no objections to a community run Facebook page. Are there several volunteers willing to give it a go?

I tried looking at the page, but Facebook kept popping up a screen every 5 seconds asking if I want to create an account. Apparently "no" is not the answer they were looking for...

I've never liked Facebook. I've had an account at two different times in my teen years, but the second one got hacked a few years ago (it's locked now), and I've had no desire to fix/delete it.

[storm5510]

Originally Posted by Happy5214

I've never liked Facebook. I've had an account at two different times in my teen years, but the second one got hacked a few years ago (it's locked now), and I've had no desire to fix/delete it.

I've not had any intrusion issues. It may be because of the password I use. It is a VIN from a car I had 40 years ago which I memorized. At the time, a lot of those were being stolen. The VIN is a jumble of 13 alphabetic characters and numbers. "xaxxaxaxxxxxx" is the form. There is no way I could memorize something like that now.

We have drifted off-topic with this, so it is time to wrap it up.

[kriesel]

Originally Posted by storm5510

I do not know what Windows 10 calls this. Windows 7 calls it "Linux on Windows." I experimented with it briefly, but never ran anything significant on it. It seems like the Windows 10 baggage would reduce the performance of anything running this way.

As far as I can tell, Microsoft and Windows 10 call it "Windows Subsystem for Linux". After following the directions at that article I gave a link for earlier, I now have Ubuntu at my beck and call on a Win10 laptop. Maybe not the full performance of dual-booting to linux, but not awful.

mprime bench results on the i7-8750h on ubuntu while win10 is running:

Prime95 64-bit version 29.8, RdtscTiming=1
Timings for 5120K FFT length (1 core, 1 worker): 127.43 ms.  Throughput:  7.85 iter/sec.
Timings for 5120K FFT length (1 core hyperthreaded, 1 worker): 66.42 ms.  Throughput: 15.06 iter/sec.
Timings for 5120K FFT length (2 cores, 1 worker): 67.16 ms.  Throughput: 14.89 iter/sec.
Timings for 5120K FFT length (2 cores hyperthreaded, 1 worker): 30.84 ms.  Throughput: 32.42 iter/sec.
Timings for 5120K FFT length (3 cores, 1 worker): 39.07 ms.  Throughput: 25.60 iter/sec.
Timings for 5120K FFT length (3 cores hyperthreaded, 1 worker): 20.89 ms.  Throughput: 47.88 iter/sec.
Timings for 5120K FFT length (6 cores, 1 worker): 21.50 ms.  Throughput: 46.50 iter/sec.
Timings for 5120K FFT length (6 cores hyperthreaded, 1 worker): 15.69 ms.  Throughput: 63.75 iter/sec.
Timings for 5376K FFT length (1 core, 1 worker): 135.43 ms.  Throughput:  7.38 iter/sec.
Timings for 5376K FFT length (1 core hyperthreaded, 1 worker): 66.47 ms.  Throughput: 15.04 iter/sec.
Timings for 5376K FFT length (2 cores, 1 worker): 63.31 ms.  Throughput: 15.79 iter/sec.
Timings for 5376K FFT length (2 cores hyperthreaded, 1 worker): 32.17 ms.  Throughput: 31.08 iter/sec.
Timings for 5376K FFT length (3 cores, 1 worker): 42.50 ms.  Throughput: 23.53 iter/sec.
Timings for 5376K FFT length (3 cores hyperthreaded, 1 worker): 23.16 ms.  Throughput: 43.17 iter/sec.
Timings for 5376K FFT length (6 cores, 1 worker): 23.65 ms.  Throughput: 42.28 iter/sec.
Timings for 5376K FFT length (6 cores hyperthreaded, 1 worker): 17.02 ms.  Throughput: 58.77 iter/sec.

prime95 on Win10

[Wed Jan 29 14:15:56 2020]
FFTlen=5120K, Type=3, Arch=4, Pass1=256, Pass2=20480, clm=4 (6 cores, 1 worker): 18.36 ms.  Throughput: 54.47 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=256, Pass2=20480, clm=2 (6 cores, 1 worker): 15.56 ms.  Throughput: 64.28 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=256, Pass2=20480, clm=1 (6 cores, 1 worker): 19.77 ms.  Throughput: 50.58 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=320, Pass2=16384, clm=4 (6 cores, 1 worker): 13.77 ms.  Throughput: 72.61 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=320, Pass2=16384, clm=2 (6 cores, 1 worker): 18.71 ms.  Throughput: 53.44 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=320, Pass2=16384, clm=1 (6 cores, 1 worker): 14.32 ms.  Throughput: 69.83 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=512, Pass2=10240, clm=4 (6 cores, 1 worker): 17.60 ms.  Throughput: 56.81 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=512, Pass2=10240, clm=2 (6 cores, 1 worker): 17.61 ms.  Throughput: 56.80 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=512, Pass2=10240, clm=1 (6 cores, 1 worker): 12.61 ms.  Throughput: 79.29 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=640, Pass2=8192, clm=4 (6 cores, 1 worker): 17.27 ms.  Throughput: 57.92 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=640, Pass2=8192, clm=2 (6 cores, 1 worker): 22.27 ms.  Throughput: 44.91 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=640, Pass2=8192, clm=1 (6 cores, 1 worker): 12.68 ms.  Throughput: 78.89 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=1024, Pass2=5120, clm=4 (6 cores, 1 worker): 19.36 ms.  Throughput: 51.65 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=1024, Pass2=5120, clm=2 (6 cores, 1 worker): 13.52 ms.  Throughput: 73.97 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=1024, Pass2=5120, clm=1 (6 cores, 1 worker): 16.59 ms.  Throughput: 60.29 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=1280, Pass2=4096, clm=4 (6 cores, 1 worker): 19.69 ms.  Throughput: 50.78 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=1280, Pass2=4096, clm=2 (6 cores, 1 worker): 12.48 ms.  Throughput: 80.10 iter/sec.
FFTlen=5120K, Type=3, Arch=4, Pass1=1280, Pass2=4096, clm=1 (6 cores, 1 worker): 17.95 ms.  Throughput: 55.72 iter/sec.

These are apples and oranges, different benchmark approaches. It's likely if I gave mprime more time in ubunto it would find a faster fft benchmark. Its one shot was faster than 11 out of the 18 run in prime95/win10. That's not bad

[storm5510]

Originally Posted by kriesel

As far as I can tell, Microsoft and Windows 10 call it "Windows Subsystem for Linux". After following the directions at that article I gave a link for earlier, I now have Ubuntu at my beck and call on a Win10 laptop. Maybe not the full performance of dual-booting to linux, but not awful.

mprime bench results on the i7-8750h on ubuntu while win10 is running:These are apples and oranges, different benchmark approaches. It's likely if I gave mprime more time in ubunto it would find a faster fft benchmark. Its one shot was faster than 11 out of the 18 run in prime95/win10. That's not bad.

No, they are not bad at all, a lot closer than I would have expected. I simply compared the same FFT size and cores used. Your laptop CPU has six cores. Does it produce much heat?

I have a much older laptop. It has a dual core i5 which runs Windows 7 Pro x64. I say dual core but it shows as four threads in the performance section of the Task Manager. It would be two physical and two logical. I have a widget that sits in the upper-right corner of the screen which displays the core temperatures. Window's 7 is really sluggish on it. I wonder if it could run Ubuntu? It has a WiFi internet connection. That might make the setup problematic without the driver available at the beginning.

[S485122]

Originally Posted by storm5510

...
it shows as four threads in the performance section of the Task Manager. It would be two physical and two logical.
...

There is no difference between the two threads running on a physical core : there is not one running on a physical core and the other on a virtual or logical core.
In general hyper-threading is not beneficial for Prime95 but in some cases using two threads per core can be beneficial, it depends on FFT size, processor, cache and memory. One notable example is the benchmark Kriesel just posted. This means that one should benchmark the different threads per core combinations to make an informed choice (that choice can also be influenced by the energy costs and the accompanying necessary thermal dissipation, but those must be measured while the benchmark is running since the benchmark does not provide them.)

Jacob

[storm5510]

Originally Posted by S485122

There is no difference between the two threads running on a physical core : there is not one running on a physical core and the other on a virtual or logical core.

In general hyper-threading is not beneficial for Prime95 but in some cases using two threads per core can be beneficial, it depends on FFT size, processor, cache and memory. One notable example is the benchmark Kriesel just posted. This means that one should benchmark the different threads per core combinations to make an informed choice (that choice can also be influenced by the energy costs and the accompanying necessary thermal dissipation, but those must be measured while the benchmark is running since the benchmark does not provide them.)

Jacob

I do not concern myself about this aspect. I allow Prime95 to choose what it wants to use. I have "Throttle=80" in prime.txt to keep the heat down. It typically runs around 60°C. The laptop sits on a cooling base containing five fans. That helps a lot. I do not use this laptop much. Perhaps a couple of days a week, at most. I keep it unplugged when it is not being used. I learned a full charge will last about three weeks if left disconnected and turned off.

[kriesel]

Originally Posted by storm5510

No, they are not bad at all, a lot closer than I would have expected. I simply compared the same FFT size and cores used. Your laptop CPU has six cores. Does it produce much heat?

I have a much older laptop. It has a dual core i5 which runs Windows 7 Pro x64. I say dual core but it shows as four threads in the performance section of the Task Manager. It would be two physical and two logical. I have a widget that sits in the upper-right corner of the screen which displays the core temperatures. Window's 7 is really sluggish on it. I wonder if it could run Ubuntu? It has a WiFi internet connection. That might make the setup problematic without the driver available at the beginning.

The Win10 i7-8750h (6-core & HT) laptop also has a gtx1050ti in it. It's what I'm typing on, and the keys are quite warm; more so toward the right. Under it I have a piece of plywood, then my clothing and me. Its exhaust can be uncomfortably warm at times, since its rated power is 90 watts. I may pick up one of those USB-powered cooler shims.
I also have a Win7 x64 i3-370M (2-core & HT) laptop, 10 years old, recently replaced the HD. It used to run both cores at 100% but eventually deteriorated to 1 core 25%. After a good compressed-air cleaning it's now capable of 2 core 80% up to about 30C ambient. This system is rated at about 35 watts total, 25 cpu package, but of course it's much slower than the i7-8750h; months to do a PRP DC at ~80M

It looks like WSL on Win7 is not possible, but there are alternatives.
https://github.com/Microsoft/WSL/issues/13

[kruoli]

Originally Posted by storm5510

It typically runs around 60 °C.

What do you have when running no throttling at all? 60 °C is really nice for a laptop! My Lenovo runs nearly 95 °C on full load (from ca. 2012).

[storm5510]

Originally Posted by kruoli

What do you have when running no throttling at all? 60 °C is really nice for a laptop! My Lenovo runs nearly 95 °C on full load (from ca. 2012).

I have the below in a post above. You must have missed it:..

I have "Throttle=80" in prime.txt to keep the heat down.

To answer your question: Prime95 ECM's, for now. The hottest I have ever ran it was mid 70's. It is not a replaceable item for me, at the moment, so I do not push it hard.