raspberry pi3 and srxsieve speed

[pepi37]

Can somebody share speed of srxsieve on raspberry pi3 .
Since price was same I will not buy previous models , but I would like to know what speed i can expect before I buy it?
Just say what sequence and what range was tested, and of course speed. So I can compare it with my PCU.
Thanks

[wombatman]

Originally Posted by pepi37

Can somebody share speed of srxsieve on raspberry pi3 .
Since price was same I will not buy previous models , but I would like to know what speed i can expect before I buy it?
Just say what sequence and what range was tested, and of course speed. So I can compare it with my PCU.
Thanks

I'd have to go back and look up the actual range and whatnot, but it's very slow. Even with multithreaded sr1sieve (which should be the fastest), I recall getting maybe 5M p/sec, where I could 10-100x that on a normal CPU. The only way I could see it working would be to have enough Pis that you could split a range into small chunks.

[M344587487]

I can if you send me a link to srxsieve and the command to use, I could only find possibly outdated versions of srsieve and I've never used it before. If you haven't bought the pi yet you should get a pi3b+, it replaced the pi3b as of last week. I can test on a 64 bit distro with a pi3b and the 32 bit raspian distro with the 3b+ (64 bit distros haven't caught up to 3b+ yet). I imagine 32 vs 64 bit is irrelevant for sieving but maybe not.

[rogue]

Originally Posted by M344587487

I can if you send me a link to srxsieve and the command to use, I could only find possibly outdated versions of srsieve and I've never used it before. If you haven't bought the pi yet you should get a pi3b+, it replaced the pi3b as of last week. I can test on a 64 bit distro with a pi3b and the 32 bit raspian distro with the 3b+ (64 bit distros haven't caught up to 3b+ yet). I imagine 32 vs 64 bit is irrelevant for sieving but maybe not.

To get the most out of the CPU you need asm routines.

[M344587487]

Originally Posted by rogue

To get the most out of the CPU you need asm routines.

A53 socs have asimd, but only in armv8 aka 64bit mode. Any versions of srsieve that use asimd?

[rogue]

Originally Posted by M344587487

A53 socs have asimd, but only in armv8 aka 64bit mode. Any versions of srsieve that use asimd?

The only asm routines in srxsieve are for x86 and x86-64.

[ET_]

Ernst Mayer is the one I know to "translate" Intel asm to ARM v8 vector asm.

But he obviously has more important work to do right now...

I have a lot of documentation, should you need it... but very little time.