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

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  1. 03-19-2010, 10:31 PM #1
    Particle
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    Timer sanity check failure.

    Code:
    Validation Version:  1.0

Processor(s):        Six-Core AMD Opteron(tm) Processor 2427
Logical Cores:       12
Physical Memory:     8,587,915,264 ( 8.00 GB )
CPU Frequency:       2,385,183,943

Program Version:     0.5.2 Build 9082 Alpha 3 (x64 SSE3 - Windows ~ Kasumi)
Constant:            Pi
Algorithm:           Chudnovsky Formula
Decimal Digits:      50,000,000
Hexdecimal Digits:   Disabled
Threading Mode:      16 threads
Computation Mode:    Ram Only
Swap Disks:          0
Working Memory:      332 MB

Start Time:          Sat Mar 20 01:19:53 2010
End Time:            Sat Mar 20 01:20:16 2010

Computation Time:    19.994 seconds
Total Time:          21.454 seconds

CPU Utilization:         825.39 %
Multi-core Efficiency:   68.78 %

Last Digits:
4127897300 0153683630 8346732220 0943329365 1632962502  :  49,999,950
5130045796 0464561703 2424263071 4554183801 7945652654  :  50,000,000

Timer Sanity Check:      Failed
Frequency Sanity Check:  Passed
ECC Recovered Errors:    0

----

Checksum:    53cc1527bc87df760d3dd7a2bb049be5848e39eb4325ca2c19572a8d6af91b1d
    Particle's First Rule of Online Technical Discussion:
    As a thread about any computer related subject has its length approach infinity, the likelihood and inevitability of a poorly constructed AMD vs. Intel fight also exponentially increases.

    Rule 1A:
    Likewise, the frequency of a car pseudoanalogy to explain a technical concept increases with thread length. This will make many people chuckle, as computer people are rarely knowledgeable about vehicular mechanics.

    Rule 2:
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    Rule 2A:
    When a poster cannot properly refute a post they do not like (as described above), the poster will most likely invent fictitious counter-points and/or begin to attack the other's credibility in feeble ways that are dramatic but irrelevant. Do not underestimate this tactic, as in the online world this will sway many observers. Do not forget: Correctness is decided only by what is said last, the most loudly, or with greatest repetition.

    Rule 3:
    When it comes to computer news, 70% of Internet rumors are outright fabricated, 20% are inaccurate enough to simply be discarded, and about 10% are based in reality. Grains of salt--become familiar with them.

    Remember: When debating online, everyone else is ALWAYS wrong if they do not agree with you!

    Random Tip o' the Whatever
    You just can't win. If your product offers feature A instead of B, people will moan how A is stupid and it didn't offer B. If your product offers B instead of A, they'll likewise complain and rant about how anyone's retarded cousin could figure out A is what the market wants.
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  2. 03-19-2010, 10:36 PM #2
    poke349
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    Quote Originally Posted by Particle View Post
    Timer sanity check failure.

    Code:
    Validation Version:  1.0

Processor(s):        Six-Core AMD Opteron(tm) Processor 2427
Logical Cores:       12
Physical Memory:     8,587,915,264 ( 8.00 GB )
CPU Frequency:       2,385,183,943

Program Version:     0.5.2 Build 9082 Alpha 3 (x64 SSE3 - Windows ~ Kasumi)
Constant:            Pi
Algorithm:           Chudnovsky Formula
Decimal Digits:      50,000,000
Hexdecimal Digits:   Disabled
Threading Mode:      16 threads
Computation Mode:    Ram Only
Swap Disks:          0
Working Memory:      332 MB

Start Time:          Sat Mar 20 01:19:53 2010
End Time:            Sat Mar 20 01:20:16 2010

Computation Time:    19.994 seconds
Total Time:          21.454 seconds

CPU Utilization:         825.39 %
Multi-core Efficiency:   68.78 %

Last Digits:
4127897300 0153683630 8346732220 0943329365 1632962502  :  49,999,950
5130045796 0464561703 2424263071 4554183801 7945652654  :  50,000,000

Timer Sanity Check:      Failed
Frequency Sanity Check:  Passed
ECC Recovered Errors:    0

----

Checksum:    53cc1527bc87df760d3dd7a2bb049be5848e39eb4325ca2c19572a8d6af91b1d
    That's interesting... I guess I overestimated the precision of the hardware timers on some of these motherboards...

    Another thing to add to my to-do list for v0.5.3.

    Anyways, I'm off for the night. Gotta catch a plane tomorrow morning.
    Last edited by poke349; 03-19-2010 at 10:40 PM.
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