Question about my CPU

ET_ · 2017-06-04, 20:46

I know it looks lazy from me, but I trust your knowledge much more than any other bit of information on the Net.

The Fact:
-------------
From the computer info panel of my Linux 16.04 LTS, it looks like I have a
Processor : Intel Pentium CPU G2030 @ 3.00 x 2
Graphic : Intel IvyBridge Desktop

From ark.intel.com it looks like a "Products formerly IvyBridge".

The Issue:
-------------
I can use neither -march=SandyBridge, -mtune=SandyBridge nor -march=IvyBridge, -mtune IvyBridge not even -mavx switches in GCC 5.4.0-6
as it ends up with an "illegal instruction" error and core dump.

The Question:
------------------
Is the Intel G2030 a real or crippled Ivy Bridge?

R. Gerbicz · 2017-06-04, 20:57

Quote:

Originally Posted by ET_

I can use neither -march=SandyBridge, -mtune=SandyBridge nor -march=IvyBridge, -mtune IvyBridge not even -mavx switches in GCC 5.4.0-6

That should be in lowercase: try -march=ivybridge or -march=sandybridge etc.
(that gcc is not very old so it should know these type of cpu).

ATH · 2017-06-04, 21:18

It is an Ivy Bridge according to these lists and charts:
https://en.wikipedia.org/wiki/List_o...essors#Pentium
https://en.wikipedia.org/wiki/Ivy_Br...top_processors

Can you run a Windows emulator in Linux? Then you can try CPU-Z, it is just a zip file to extract no installation. It can tell you the family and also which instructions are supported (AVX/AVX2/FMA3 etc):
http://www.cpuid.com/softwares/cpu-z.html

sdbardwick · 2017-06-04, 22:47

Pentium series are semi-crippled. Notably, they do not support AVX; SSE 4.1/4.2 only.

VictordeHolland · 2017-06-05, 10:02

Celeron and Pentium don't support AVX and other fancy new features, to differentiate them from Core i3.

You might be able to use these to tell the compiler which features the processor has (or hasn't in this case)
-msse
-msse2
-msse3
-mssse3
-msse4.1
-msse4.2
-mno-avx (to tell the compiler to not use AVX)

ET_ · 2017-06-05, 10:52

Thank you guys for the quick answers

@ATH: I tried both ways just to be sure, and no one worked.

I assume I should be content wirh SSE 4.2 . Oh, well...

2017-06-04, 20:46	#1
ET_ Banned "Luigi" Aug 2002 Team Italia 61×79 Posts	Question about my CPU I know it looks lazy from me, but I trust your knowledge much more than any other bit of information on the Net. The Fact: ------------- From the computer info panel of my Linux 16.04 LTS, it looks like I have a Processor : Intel Pentium CPU G2030 @ 3.00 x 2 Graphic : Intel IvyBridge Desktop From ark.intel.com it looks like a "Products formerly IvyBridge". The Issue: ------------- I can use neither -march=SandyBridge, -mtune=SandyBridge nor -march=IvyBridge, -mtune IvyBridge not even -mavx switches in GCC 5.4.0-6 as it ends up with an "illegal instruction" error and core dump. The Question: ------------------ Is the Intel G2030 a real or crippled Ivy Bridge? Last fiddled with by ET_ on 2017-06-04 at 20:47

2017-06-04, 21:18	#3
ATH Einyen Dec 2003 Denmark 2×1,579 Posts	It is an Ivy Bridge according to these lists and charts: https://en.wikipedia.org/wiki/List_o...essors#Pentium https://en.wikipedia.org/wiki/Ivy_Br...top_processors Can you run a Windows emulator in Linux? Then you can try CPU-Z, it is just a zip file to extract no installation. It can tell you the family and also which instructions are supported (AVX/AVX2/FMA3 etc): http://www.cpuid.com/softwares/cpu-z.html Last fiddled with by ATH on 2017-06-04 at 21:18

2017-06-05, 10:02	#5
VictordeHolland "Victor de Hollander" Aug 2011 the Netherlands 2³·3·7² Posts	Celeron and Pentium don't support AVX and other fancy new features, to differentiate them from Core i3. You might be able to use these to tell the compiler which features the processor has (or hasn't in this case) -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mno-avx (to tell the compiler to not use AVX) Last fiddled with by VictordeHolland on 2017-06-05 at 10:03

2017-06-04, 22:47	#4
sdbardwick Aug 2002 North San Diego County 5×137 Posts	Pentium series are semi-crippled. Notably, they do not support AVX; SSE 4.1/4.2 only.

2017-06-05, 10:52	#6
ET_ Banned "Luigi" Aug 2002 Team Italia 61·79 Posts	Thank you guys for the quick answers @ATH: I tried both ways just to be sure, and no one worked. I assume I should be content wirh SSE 4.2 . Oh, well...