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#78 |
P90 years forever!
Aug 2002
Yeehaw, FL
3×11×239 Posts |
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Ah, you have an early 25.9 build. That line was added for an i7 with hyperthreading disabled in the BIOS. CPUID reports the chip can run 8 threads on 4 cores but the OS says there are only 4 logical processors. The logical assumption is that hyperthreading has been disabled in the BIOS.
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#79 |
Oct 2008
n00bville
2D816 Posts |
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Did anyone try to use 8 hyperthreads with the Core i7 ... is prime95 faster than 4 'real ones'
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#80 |
P90 years forever!
Aug 2002
Yeehaw, FL
3×11×239 Posts |
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There were a couple of threads on that. I don't remember the exact results, but as I recall multithreading (running 4 workers each using 2 threads) was worth plus-or-minus a few percent.
Last fiddled with by Prime95 on 2009-08-14 at 01:24 |
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#81 |
Dec 2003
Hopefully Near M48
110110111102 Posts |
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I'm trying to install this on Linux; but it isn't working. After unzipping and then untarring, a bunch of files show up as expected. But typing ./mprime then gives the error messages:
./mprime: /lib/i686/libpthread.so.0: version `GLIBC_2.3.2' not found (required by ./mprime) ./mprime: /lib/i686/libc.so.6: version `GLIBC_2.3.4' not found (required by ./mprime) |
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#82 |
Aug 2002
223 Posts |
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The link in item 0 for the Mac GUI version should be Prime95-MacOSX-2511.zip
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#83 | |
Jul 2006
Calgary
52×17 Posts |
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Alternatively try to find a static linked version of mprime. I'm not sure if there is one currently offered. |
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#84 | |
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
10100001111012 Posts |
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http://www.mersenneforum.org/showthread.php?t=11025 Specifically the results seen by Phantomas with AffinityScramble? |
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#85 |
Mar 2003
Melbourne
5·103 Posts |
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I'll add my machine in the 'me too' basket. I have a corei7 with 6GiB ram.
Yep I have the incorrect detection of core/HT. 25.11 detects 8 core, 1x hyperthread. 25.09 detects correctly 4core, 2x hyperthread. Setting the following in local.txt fixed things as a workaround: NumCPUs=4 CpuNumHyperthreads=2 CpuSpeed=2699 Of course CpuSpeed is different depending which corei7 you have. -- Craig |
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#86 | |
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
52·17 Posts |
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/proc/cpuinfo behaves as expected and shows 8 logical processors with HT enabled and 4 when disabled. Code:
:::::::::::::: readcores.asm :::::::::::::: section .text global _start _start: mov eax, 04h ; EAX argument to CPUID mov ecx, 0 ; ECX argument to CPUID cpuid ; Perform the CPUID mov ebx, eax ; Copy EAX to EBX shr ebx, 26 ; Get bits 26-33 mov eax, 1 ; exit() system call int 80h ; Return the results as exit value :::::::::::::: readhts.asm :::::::::::::: section .text global _start _start: mov eax, 01h ; EAX argument to CPUID cpuid ; Perform the CPUID shr ebx, 16 ; Get bits 16-23 mov eax, 1 ; exit() system call int 80h ; Return the results as exit value Code:
nasm -f elf64 readhts.asm ld -o readhts readhts.o ./readhts echo $? Last fiddled with by patrik on 2009-09-06 at 21:40 Reason: Added note |
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#87 | |
P90 years forever!
Aug 2002
Yeehaw, FL
3×11×239 Posts |
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Did I read the Intel docs incorrectly? Anyone with ideas for a workaround? |
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#88 |
Mar 2007
179 Posts |
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Hello,
I need to stop Prime95 for an hour or so at a time, a few times a week, on one of my machines. I've been digging through the documentation and can't seem to find the settings to do this. (I know I've seen this before somewhere.) Can someone please point me in the right direction? Thanks, -- Rich |
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Thread Tools | |
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