Is that faster than FMA3 ?
 

Interesting, thanks Bill.  I don't think I have any CPUs with that AVX 512 instruction set.
I have 5930k, 8600k, 8086k  x99 and z370  chip set, they are my newest, which is not all that old at all. 
 
If it runs hotter than FMA3 or AVX2 and you have to back it off, is it still faster. Guess we will find out after testing.
Will the program use AVX 512 or will it use FMA3. Seems to want to use FMA3 not AVX for some reason.

Running PPS-Mega (LLR) v8.03
3 @ 4MT
https://www.primegrid.com/results.php?hostid=920343
Old School 4MT
https://www.primegrid.com/results.php?hostid=939093
Old School 6MT
https://www.primegrid.com/results.php?hostid=807978
 
 

bill1024

bcavnaugh
Running PPS-Mega (LLR) v8.03
3 @ 4MT
https://www.primegrid.com/results.php?hostid=920343
Old School 4MT
https://www.primegrid.com/results.php?hostid=939093
Old School 6MT
https://www.primegrid.com/results.php?hostid=807978

Does that mean you are running 3 tasks 4 threads MT on one CPU? What CPU and how much cache?
What RAM and at what speed? Ripjaws V Series 3200 (PC4 25600) F4-3200C14Q-64GVK
What's old school? Looks like it is still using FMA3, no? YES
 
I thought I  read that it is best to try to keep the tasks in cache memory and try not to use system mem.
You're getting more throughput that way? 

Yes
Ripjaws V Series 3200 (PC4 25600) F4-3200C14Q-64GVK
Intel® Core™ i9-7940X X-series Processor
# of AVX-512 FMA Units 2 and 19.25M Cache 
See https://www.primegrid.com/forum_thread.php?id=8601&nowrap=true#129682
UPDATE May 22nd:  It has come to my attention that while CPUs with 2 AVX-512 execution units gain a substantial boost in performance, mid-range CPUs with only 1 AVX-512 execution unit may see a significant decrease in performance with the new LLR app.  Obviously, this is not intended.  For the time being there is no workaround for this.  If you have a CPU that supports AVX-512, but has only a single AVX-512 execution unit, you may want to use the anonymous platform mechanism (app_info.xml) to run the older version of LLR.  With a challenge starting tomorrow, we won't make changes to the app until at least a week.  We apologize for any inconvenience this may cause.
 
https://www.primegrid.com/result.php?resultid=1001845684 

Stderr output

<core_client_version>7.14.2</core_client_version>
<![CDATA[
<stderr_txt>
BOINC llr wrapper (version 8.00)
Using Jean Penne's llr (64 bit)
LLR Program - Version 3.8.23, using Gwnum Library Version 29.8

LLR command line: primegrid_cllr.exe -d -oDiskWriteTime=1 llr.in
Using all-complex AVX-512 FFT length 240K, Pass1=640, Pass2=384, clm=1, a = 5
16:46:55 (5792): called boinc_finish

</stderr_txt>
]]>

https://www.primegrid.com/result.php?resultid=1001840622

Stderr output

<core_client_version>7.14.2</core_client_version>
<![CDATA[
<stderr_txt>
BOINC llr wrapper (version 8.00)
Using Jean Penne's llr (64 bit)
LLR Program - Version 3.8.23, using Gwnum Library Version 29.8

LLR command line: primegrid_cllr.exe -d -oDiskWriteTime=1 -oThreadsPerTest=4 llr.in
Using all-complex AVX-512 FFT length 280K, Pass1=640, Pass2=448, clm=1, 4 threads, a = 3
16:16:36 (3520): called boinc_finish

</stderr_txt>
]]>

 
Old School AMD 6MT
https://www.primegrid.com/result.php?resultid=1001829364

Stderr output

<core_client_version>7.14.2</core_client_version>
<![CDATA[
<stderr_txt>
BOINC llr wrapper (version 8.00)
Using Jean Penne's llr (64 bit)
LLR Program - Version 3.8.23, using Gwnum Library Version 29.8

LLR command line: primegrid_cllr.exe -d -oDiskWriteTime=1 -oThreadsPerTest=6 llr.in
Using all-complex FMA3 FFT length 240K, Pass1=1280, Pass2=192, clm=2, 6 threads, a = 3
16:46:05 (7048): called boinc_finish

</stderr_txt>
]]>

 
Non-MT
https://www.primegrid.com/result.php?resultid=1001850152

Stderr output

<core_client_version>7.14.2</core_client_version>
<![CDATA[
<stderr_txt>
BOINC llr wrapper (version 8.00)
Using Jean Penne's llr (64 bit)
LLR Program - Version 3.8.23, using Gwnum Library Version 29.8

LLR command line: primegrid_cllr.exe -d -oDiskWriteTime=1 llr.in
Using all-complex FMA3 FFT length 240K, Pass1=1280, Pass2=192, clm=2, a = 3
18:24:55 (4428): called boinc_finish

</stderr_txt>
]]>

 
Old School Intel 4MT
https://www.primegrid.com/result.php?resultid=1001842263

Stderr output

<core_client_version>7.14.2</core_client_version>
<![CDATA[
<stderr_txt>
BOINC llr wrapper (version 8.00)
Using Jean Penne's llr (64 bit)
LLR Program - Version 3.8.23, using Gwnum Library Version 29.8

LLR command line: primegrid_cllr.exe -d -oDiskWriteTime=1 -oThreadsPerTest=4 llr.in
Using all-complex FMA3 FFT length 240K, Pass1=1280, Pass2=192, clm=2, 4 threads, a = 7
16:49:32 (5144): called boinc_finish

</stderr_txt>
]]>

 

Very good Bill, Nice CPU by the way!

You have to know the size of the tasks you're runnning. that CPU has a nice chunk of cache.
Some sub projects are small, like Sophie, others are much bigger.
 

It was too big for my 8086, I tried two at a time and my time more than tripled.
Maybe on my xeons I can, they have bigger cache.
 
Try one at a time, then try two, if you can do two times the tasks in less that two times the time, worth doing.
 
Maybe with 14 cores doing 14 at a time may take a long time, but maybe able to do 14 that way faster than 14 fast MT.
Funny how that works sometimes. But primes is also about getting the 1st task in.
But this sub project, primes are very rare, I doubt one will be found this challenge, challenges are about throughput. 
Like with the 4P AMD on some projects they seemed slow, but dropping 48 at a time made up for it. 
Too late to test every which way now.