03-07-2012
Hyperthreading, currently, is for 2 threads per core, however they share resources, and can cause some issues with performance. You may want to look output of using cat on /proc/cpuinfo and look for:
core id, cpu cores, physical id, siblings, and if you see the "word" ht in flags.
You can disable Hyperthreading. Since the two threads share resources, they are not deterministic in performance.
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10. SuSE
Here is a chance for Linux users to easily compare Linux CPU info and some meaningless BOGOMIPS. Everyone who is running Linux is welcome to:
cat /proc/cpuinfo
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Here is the results for www.unix.com:
processor : 0
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LEARN ABOUT OPENSOLARIS
openssl_ia32cap
OPENSSL_ia32cap(3openssl) OpenSSL OPENSSL_ia32cap(3openssl)
NAME
OPENSSL_ia32cap - finding the IA-32 processor capabilities
SYNOPSIS
unsigned long *OPENSSL_ia32cap_loc(void);
#define OPENSSL_ia32cap (*(OPENSSL_ia32cap_loc()))
DESCRIPTION
Value returned by OPENSSL_ia32cap_loc() is address of a variable containing IA-32 processor capabilities bit vector as it appears in EDX
register after executing CPUID instruction with EAX=1 input value (see Intel Application Note #241618). Naturally it's meaningful on
IA-32[E] platforms only. The variable is normally set up automatically upon toolkit initialization, but can be manipulated afterwards to
modify crypto library behaviour. For the moment of this writing three bits are significant, namely bit #28 denoting Hyperthreading, which
is used to distinguish Intel P4 core, bit #26 denoting SSE2 support, and bit #4 denoting presence of Time-Stamp Counter. Clearing bit #26
at run-time for example disables high-performance SSE2 code present in the crypto library. You might have to do this if target OpenSSL
application is executed on SSE2 capable CPU, but under control of OS which does not support SSE2 extentions. Even though you can manipulate
the value programmatically, you most likely will find it more appropriate to set up an environment variable with the same name prior start-
ing target application, e.g. 'env OPENSSL_ia32cap=0x10 apps/openssl', to achieve same effect without modifying the application source code.
Alternatively you can reconfigure the toolkit with no-sse2 option and recompile.
OpenSSL-0.9.8 Oct 11 2005 OPENSSL_ia32cap(3openssl)