New Multi-Threaded Pi Program - Faster than SuperPi and PiFast

[rge]

^ nice!

Thanks....only I have to stick to lower size benches, so the dual sockets dont completely hammer me even at their stock speed.

[poke349]

@RGE
Looks like I've got some updating to do on my website...

Since you clearly demolished the single-socket rankings for those sizes...

[poke349]

Updated the records on my site.
http://www.numberworld.org/y-cruncher/#FastestTimes


I just ran some benchmarks on my laptop...
And I have to say that the turbo boost is aggressive enough to "utterly destroy" the multi-core scalability of the program. (In a good way )

Under 4-core hyper-threaded intensive load, turbo won't activate at all.
+1 (1.73 GHz) is the max specification, but I only see it when it's under a less intensive load (by running less intensive stuff, or by disabling HT).

1.6 GHz under 8-thread load:



Under single-threaded load (locked to a single-core via processor affinity), it gets all the way to +8 turbo (2.66 GHz).
+9 (2.80 GHz) is the max specification, but again, I only see it when it's under a load that isn't as cpu-intensive... (such as compiling code)

2.66 GHz under 1-thread load:



And here are the results of single-thread vs. multi-threaded:


Only 2.64x faster with multi-threading. (whereas the desktop i7s will get more than 4x at this size)


Assuming turbo boost gets more and more aggressive in the future, we'll be seeing more of this.


*I was originally gonna make a specially optimized binary for this laptop (x64 SSE4.1 ~ Akari), but seeing as how temps will reach almost 90C under y-cruncher load, I don't think I'm gonna do it.
(Depending on the amount of ram, it usually takes about 12-48 hours of 100% cpu across all cores to tune for any particular machine... )

It's too nice of a laptop to destroy at such a early age. (I love this thing... Thanks 舅舅!!! Gonna get an SSD for it and bump the HD to the second HD slot. )