[YLUG] Why is this so much faster on an Opteron?

[Alex Smith]

Robert Hulme wrote:
>>>> How long does it take to run on peoples machines?
>>>>         
>>> According to time, approx 3 seconds on my Macbook Pro (2.2 GHz Core 2
>>> Duo).
>>>       
>>  0.07s user 0.02s system 75% cpu 0.116 total
>> model name      : Intel(R) Pentium(R) 4 CPU 3.06GHz
>>     
> OK, here's a good question. Why is Alex's P4 soooo much faster than
> the P4 I have here?
>
> Alex could you post your /proc/cpuinfo perhaps?
>
> Also does anyone have any idea wtf is going on? :P I'm using gcc (GCC)
> 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
>
> My /proc/cpuinfo looks like this:
> trueman% cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 4
> model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
> stepping        : 3
> cpu MHz         : 2800.000
> cache size      : 2048 KB
> physical id     : 0
> siblings        : 2
> core id         : 0
> cpu cores       : 1
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 5
> wp              : yes
> flags           : 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 ht tm pbe nx
> lm constant_tsc pni monitor ds_cpl est cid cx16 xtpr
> bogomips        : 5990.63
> clflush size    : 64
>
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 4
> model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
> stepping        : 3
> cpu MHz         : 2800.000
> cache size      : 2048 KB
> physical id     : 0
> siblings        : 2
> core id         : 0
> cpu cores       : 1
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 5
> wp              : yes
> flags           : 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 ht tm pbe nx
> lm constant_tsc pni monitor ds_cpl est cid cx16 xtpr
> bogomips        : 5985.52
> clflush size    : 64
>
> -Rob
>
>   
Disregard that, I suck. :-)        
%  gcc -O2 foo.cpp -o ./foo && time 
./foo                                                                                                                                                                                               
~
./foo  35.15s user 0.14s system 74% cpu 47.516 total


More realistic, there. ;)