Hi Andry and Adam My test again. No desktop, etc. I just run dgemm. Contrary to Adam's result, Hyper Threading makes the performance worse. all tests are done on Core i7 920 @ 2.67GHz. (TurboBoost @2.8GHz)
Turbo Boost off, Hyper threading off: 82% (35GFlops) [1] Turbo Boost off, Hyper threading off: 72% (30.5GFlops) [2] Turbo Boost on, Hyper threading on: 71% (32GFlops) [3] Turbo Boost off, Hyper threading off: 84-89% (38-40GFlops) [4] ---my system--- CPU: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz (2683.44-MHz K8-class CPU) Origin = "GenuineIntel" Id = 0x106a5 Stepping = 5 Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Features2=0x98e3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT> AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM> AMD Features2=0x1<LAHF> TSC: P-state invariant real memory = 12884901888 (12288 MB) avail memory = 12387717120 (11813 MB) ACPI APIC Table: <110909 APIC1026> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs FreeBSD/SMP: 1 package(s) x 4 core(s) ---my system--- ---DETAILS--- [1] % ./dgemm n: 3000 time : 57.666717 or 16.339074 Mflops : 33060.624827 n: 3100 time : 61.502677 or 16.597376 Mflops : 35910.025544 n: 3200 time : 69.075401 or 19.199833 Mflops : 34144.297133 n: 3300 time : 73.699540 or 19.633594 Mflops : 36618.756539 n: 3400 time : 82.256194 or 22.373651 Mflops : 35144.518837 n: 3500 time : 88.975662 or 24.118761 Mflops : 35563.394249 n: 3600 time : 96.436652 or 26.027588 Mflops : 35861.148385 n: 3700 [2] % ./dgemm n: 3000 time : 139.622739 or 17.693806 Mflops : 30529.327312 n: 3100 time : 154.344971 or 19.566886 Mflops : 30460.247702 n: 3200 time : 169.507739 or 21.467100 Mflops : 30538.116602 n: 3300 time : 186.363773 or 23.615281 Mflops : 30444.600545 n: 3400 time : 203.798979 or 25.817667 Mflops : 30456.322788 n: 3500 ... [3] % ./dgemm n: 3000 time : 134.673079 or 16.958682 Mflops : 31852.711082 n: 3100 time : 148.410085 or 18.663248 Mflops : 31935.073574 n: 3200 time : 162.835473 or 20.468825 Mflops : 32027.475770 n: 3300 time : 179.025370 or 22.479189 Mflops : 31983.262501 n: 3400 time : 195.859710 or 24.663009 Mflops : 31882.208788 n: 3500 [4] % ./dgemm n: 3000 time : 54.259647 or 14.684309 Mflops : 36786.204907 n: 3100 time : 60.899147 or 17.124599 Mflops : 34804.447141 n: 3200 time : 64.295342 or 17.490787 Mflops : 37480.577569 n: 3300 time : 69.781247 or 18.288840 Mflops : 39311.284796 n: 3400 time : 79.234397 or 21.829736 Mflops : 36020.187858 n: 3500 time : 83.905419 or 22.381237 Mflops : 38324.289174 n: 3600 time : 92.195022 or 25.105942 Mflops : 37177.621122 n: 3700 time : 97.718841 or 25.434243 Mflops : 39841.319494 n: 3800 time : 105.740463 or 27.414029 Mflops : 40042.592613 n: 3900 time : 113.980157 or 29.678505 Mflops : 39984.635420 n: 4000 time : 122.941569 or 31.946174 Mflops : 40077.412531 n: 4100 ---DETAILS--- From: Adam Vande More <amvandem...@gmail.com> Subject: Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920 Date: Wed, 14 Apr 2010 11:34:45 -0500 >> > time : 162.488885 or 20.430651 >> > Mflops : 32087.318295 >> > n: 3300 >> > time : 178.497079 or 22.446093 >> > Mflops : 32030.420499 >> > n: 3400 >> > time : 195.550715 or 24.586152 >> > Mflops : 31981.873273 >> > n: 3500 >> > time : 213.403379 or 26.825058 >> > Mflops : 31975.513363 >> > n: 3600 >> > ... >> > above output is on Core i7 920 (2.66GHz; TurboBoost on) >> >> My results: >> $ ./dgemm >> n: 3000 >> time : 54.151302 or 28.189781 >> Mflops : 19162.263125 >> n: 3100 >> time : 60.157449 or 32.214141 >> Mflops : 18501.570537 >> n: 3200 >> time : 65.753191 or 34.114872 >> Mflops : 19216.393378 >> >> CPU: >> CPU: Intel(R) Core(TM)2 Duo CPU E7300 @ 2.66GHz (2653.35-MHz K8-class >> CPU) >> Origin = "GenuineIntel" Id = 0x10676 Stepping = 6 >> >> >> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> >> >> >> Features2=0x8e39d<SSE3,DTES64,MON,DS_CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1> >> AMD Features=0x20100800<SYSCALL,NX,LM> >> AMD Features2=0x1<LAHF> >> TSC: P-state invariant >> ⋮ >> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs >> FreeBSD/SMP: 1 package(s) x 2 core(s) >> >> FreeBSD: >> FreeBSD 8.0-STABLE r205070 amd64 >> >> Please note that the system was not dedicated to the test, I had >> Xorg+KDE3+thunderbird+skype+kopete+konsole(s) plus a bunch of daemons >> running. >> That probably explains irregularities in the results. >> >> I am not sure how exactly theoretical maximum should be calculated, I used >> 2 * >> 2.66G * 4 ≈ 21.3G. >> And so 19.2G / 21.3G ≈ 90%. >> >> Not as bad as what you get. >> Although not as good as what you report for Linux. >> But given the impurity and imprecision of my test… >> >> P.S. the machine is two-core obviously :-) >> Don't have anything with more cpus/cores handy.
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