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CPU Optimizations

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Posted

Hi All,

I have been playing around with some Compiler Optimizations in the Linux Kernel. I want to know what your results are if you run this in a terminal.

Whats your Hardware and whats your kernel version?

[CODE]time echo "scale=5000; a(1)*4" | bc -l[/CODE]

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Posted

[CODE]
3.141592653589793238462643383279502884197169399375105820974944592307\
81640628620899862803482534211706798214808651328230664709384460955058\
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01566049631862947265473642523081770367515906735023507283540567040386\
74351362222477158915049530984448933309634087807693259939780541934144\
73774418426312986080998886874132604720
real 0m17.893s
user 0m17.837s
sys 0m0.028s
[/CODE]

What's that supposed to mean? :huh:

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Posted

Is that the number pi?

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Posted

Pi is 1.34~

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Posted

Note to all: You should [b]never[/b] mindlessly type commands into a console when asked without researching and understanding their function.
1 person likes this

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Posted

Yeah I should have mentioned that it calculates Pi. Im a trust worthy member around here... Sort of :-p But yeah

[quote][color=#282828]Note to all: You should [/color][b]never[/b][color=#282828] mindlessly type commands into a console when asked without researching and understanding their function.[/color][/quote]

Yours does it faster than my hardware! Mine does it in 22seconds! ...What hardware are you running?

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Posted

unless it says sudo, you won't do that much...

I have an i5 3570K (no OC yet), and ASRock Extreme 3

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Posted

[code]
3.141592653589793238462643383279502884197169399375105820974944592307\
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73774418426312986080998886874132604720

real 0m49.791s
user 0m49.520s
sys 0m0.013s
[/code]

[b]Hardware[/b][list]
[*]Intel Core 2 Duo CPU T5250 (-MCP-) clocked at 1500.000 Mhz
[*]2GB RAM
[/list]
[b]Kernel[/b][list]
[*]3.8.7-1-ARCH x86_64
[/list]

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Posted

[CODE]
3.141592653589793238462643383279502884197169399375105820974944592307\
81640628620899862803482534211706798214808651328230664709384460955058\
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07059870062232755603634700698595476406849071291561266671434287786971\
65825847993825298354061509667094723200

real 5m44.403s
user 5m44.474s
sys 0m0.012s
[/CODE]

[b]Hardware[/b][list]
[*]Sun UltraSparc T1 (Niagara) CPU clocked at 1.0 GHz
[*]8 GB of RAM
[/list]
[b]Kernel[/b][list]
[*]Debian 3.2.39-2 sparc64 (SMP)
[/list]

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Posted

[CODE]
3.141592653589793238462643383279502884197169399375105820974944592307\
81640628620899862803482534211706798214808651328230664709384460955058\
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74351362222477158915049530984448933309634087807693259939780541934144\
73774418426312986080998886874132604720

real 0m33.375s
user 0m33.369s
sys 0m0.001s
[/CODE]

[b]Hardware[/b][list]
[*]Intel Core 2 Quad CPU Q6600 clocked at 2.40 GHz
[*]8 GB of RAM
[/list]
[b]Kernel[/b][list]
[*]2.6.32-358.2.1.el6.x86_64 (SMP)
[/list]

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"real 0m33.296s
user 0m33.268s
sys 0m0.012s"
(hack)Mac, Q6700, 6GB DDR2 RAM

"real 0m30.680s
user 0m30.627s
sys 0m0.003s"
Arch VM on ESXi server, 8 cores of 16 allowed from dual E5620, 4GB DDR3 RAM

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[quote name='Mindovermaster' timestamp='1366576981' post='595651198']
Pi is 1.34~
[/quote]

Are you insane?? :woot: :wacko: :rofl:
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[b]Hardware:[/b] Intel

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5 minutes and 44 seconds seems nigh unbeatable based on everyone else's times (including my own). I THINK I'M GOING TO WIN!

Too bad I don't have a working hard drive for my PowerBook G4 anymore. Maybe that machine would take [i]even longer[/i] to compute Pi to 5000 decimal places and multiply it by four! I really want to try it now...

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Intel

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[quote name='Mindovermaster' timestamp='1366576981' post='595651198']
Pi is 1.34~
[/quote]

wait what? not it isnt its 3.14........

[quote name='Setnom' timestamp='1366576439' post='595651188']
Is that the number pi?
[/quote]

yep that is pi expanded out

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I am also interested in knowing what, specifically, you are testing. Which compiler options are you enabling/disabling? Which compiler are you using? Which distribution are you compiling the kernel on? How are you compiling the kernel (using kbuild, Debian kernel build scripts, or something else)? Are you using the mainline kernel, a stable kernel, a specific distro kernel, or something else?

[b]Off Topic:[/b] ChuckFinley, I really like your user name! I'm a fan of that show too. I've watched all the episodes they have on Netflix. I'll probably have to buy it outright at some point.

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[quote name='Circaflex' timestamp='1366597464' post='595651618']
wait what? not it isnt its 3.14........
[/quote]

I had a very bad headache at that time. My head's not always thinking logically... :|
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[quote name='Mindovermaster' timestamp='1366597990' post='595651636']
I had a very bad headache at that time. My head's not always thinking logically... :|
[/quote]

Its okay. You're not the only one who made a mistake. I stated that it is "Pi to 5000 decimal places [multiplied] by four", but that's not actually true. The command is just timing how long it takes for [i]bc[/i] to compute Pi (to 5000 decimals of precision).

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[quote name='Salutary7' timestamp='1366596831' post='595651606']
Intel

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[quote name='Mindovermaster' timestamp='1366577569' post='595651218']
unless it says sudo, you won't do that much...

I have an i5 3570K (no OC yet), and ASRock Extreme 3
[/quote]

stupid thing to say, I would rather have a command break my system (which can be reinstalled) than some command erasing all my personal files and work that I had done that day.

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real 0m20.158s
user 0m20.149s
sys 0m0.007s

MBPr
[size=2]
2.6 GHz Intel Core i7[/size]

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Calculating Pi on the (Raspberry) Pi:
real 4m4.804s
user 4m3.870s
sys 0m0.140s

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[quote name='xorangekiller' timestamp='1366589984' post='595651460']
[CODE]
...snip...
65825847993825298354061509667094723200

[b]Hardware[/b][list]
[*]Sun UltraSparc T1 (Niagara) CPU clocked at 1.0 GHz
[*]8 GB of RAM
[/list]
[b]Kernel[/b][list]
[*]Debian 3.2.39-2 sparc64 (SMP)
[/list]
[/quote]

[quote name='xorangekiller' timestamp='1366590505' post='595651468']
[CODE]
...snip...
73774418426312986080998886874132604720

[b]Hardware[/b][list]
[*]Intel Core 2 Quad CPU Q6600 clocked at 2.40 GHz
[*]8 GB of RAM
[/list]
[b]Kernel[/b][list]
[*]2.6.32-358.2.1.el6.x86_64 (SMP)
[/list]
[/quote]

Why do you get different results in your Sun system? Which one is flawed?

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Thanks for these guys, Looks like we have a healthy discussion going. Yeah why does the SPARC get a different result and also take over 5mins to do it. It looks like the i7's are the winners. I got mine to a 22sec. I am trying the latest bleeding edge mainline kernel with the i7 gcc optimizations.

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