20050412, 11:57  #34 
Banned
"Luigi"
Aug 2002
Team Italia
2^{5}·149 Posts 
Benchmark timings
George, I have a dumb question about v24.11
Looking at the factoring benchmark, I noticed that the best time results are printed in ms. Assuming that there are about 1,029,407,319 k from 57 to 58 bits (exponent 35000011), and that about 95% of those k are sieved out, we have about 51,470,366 k to check. Prime95 runs the factoring work between 57 and 58 bits in about 15,450 ms and 5859 in 31,500 ms (time of Prime95); the benchmark shows a timing of about 7 ms for bit depth comprised between 58 and 61 bits, so I assume the same for 57 bits. The "one iteration time" in factoring should be 15,450/51,470,366 = 30*10^4 ms; 7 ms are worth about 23,320 iterations. As a demonstration, if we divide k by 23,320 and multiply the result by 7, we again have 15,450 ms May I ask you why did you choose 23,320 iterations for the benchmark? Luigi Last fiddled with by ET_ on 20050412 at 11:58 
20050412, 13:36  #35 
P90 years forever!
Aug 2002
Yeehaw, FL
7×1,019 Posts 
You lost me.
The 32bit factoring assembly code processes a 16KB sieve. This is "one iteration" in the benchmark. When doing trial factoring you control how often prime95 writes to the screen in Options / Preferences. The 64bit factoring assembly code processes a 48KB sieve. This is "one iteration". The benchmarking code divides this time by 3 so you can properly compare it to 32bit machines. 
20050412, 22:13  #36 
Mar 2005
Denmark
7_{8} Posts 
I seeem to be having a problem with sprime when I try to factor a number that requires FFT length of 1024K
I get the following message: Code:
Starting P1 factoring with B1=40000, B2=420000 Chance of finding a factor is an estimated 0.92% P1 on 55459*2^9011278+1 with B1=40000, B2=420000 Using FFT length 1024K SUMOUT error occurred. I am testing this on another machine just now ... I haven't had any hardware problems with this computer so far. Anyhow just thought I would report this ... it may just be a hardware error on my side. 
20050412, 22:26  #37  
Banned
"Luigi"
Aug 2002
Team Italia
2^{5}·149 Posts 
Quote:
I'd better look into Prime95 source code before asking dumb questions. Your answer helped, thank you. Luigi 

20050412, 22:40  #38  
Mar 2005
Denmark
7_{10} Posts 
Quote:


20050413, 00:43  #39  
P90 years forever!
Aug 2002
Yeehaw, FL
1101111011101_{2} Posts 
Quote:


20050413, 04:36  #40  
Mar 2005
Denmark
7 Posts 
Quote:
The line I have in worktodo.ini is: Code:
Pfactor=55459,2,9011278,1,49,1.5 Code:
OldCpuType=12 OldCpuSpeed=3017 DayMemory=768 NightMemory=768 CPUHours=24 DayStartTime=480 DayEndTime=1320 Pid=0 RollingAverage=1000 RollingStartTime=0 

20050413, 08:07  #41  
Mar 2005
Denmark
7_{8} Posts 
Quote:
Sorry about all this fuss It works fine when i actually use ver. 2.4.11 The problem arose because I wrongly assumed that the static binary was called sprime, while it is actually mprime ... I had an sprime binary in the directory from an old package that contained both the sprime and mprime. 

20050418, 23:18  #42 
P90 years forever!
Aug 2002
Yeehaw, FL
15735_{8} Posts 
I've just uploaded my third attempt at 24.11.
The only new feature is I've spent time optimizing the SSE2 macros further. P4s will see about a 1% boost and AMD64s will see about a 2.5% boost. 
20050418, 23:40  #43 
Feb 2005
Colorado
523 Posts 
Earlier in this thread you mentioned only AMD64 machines should run this version. Is it now OK for P4 machines to run this version on exponents currently being tested by version 23.8?

20050419, 00:03  #44  
P90 years forever!
Aug 2002
Yeehaw, FL
7×1,019 Posts 
Quote:


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