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Full Discussion: AVX for Linux (32-bit)
Special Forums UNIX and Linux Applications High Performance Computing AVX for Linux (32-bit) Post 302901012 by GG2014 on Saturday 10th of May 2014 11:19:16 AM
Old 05-10-2014
AVX for Linux (32-bit)

For Intel processors we've a lot of new instruction sets (AVX and AVX2 already exists, AVX512 is announced). Therefore an application has to check during run time which instruction sets are available. I've written for that purpopse some procedures, which are callable from C or C++.

A strange result is that: With Ubuntu (64-bit), AVX is properly indicated. The 32-bit version doesn't indicate AVX (same CPU, other OS). So, the reason is probably that AVX isn't supported from the 32-bit kernel. I've an Ivy Bridge processor, which supports AVX. Does anyone know more destails? Your help and tips are welcome.

Gunther
 

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isalist(1)							   User Commands							isalist(1)

NAME
isalist - display the native instruction sets executable on this platform SYNOPSIS
isalist DESCRIPTION
isalist prints the names of the native instruction sets executable on this platform on the standard output, as returned by the SI_ISALIST command of sysinfo(2). The names are space-separated and are ordered in the sense of best performance. That is, earlier-named instruction sets may contain more instructions than later-named instruction sets; a program that is compiled for an earlier-named instruction sets will most likely run faster on this machine than the same program compiled for a later-named instruction set. Programs compiled for instruction sets that do not appear in the list will most likely experience performance degradation or not run at all on this machine. The instruction set names known to the system are listed in isalist(5). These names may or may not match predefined names or compiler options in the C language compilation system, ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
optisa(1), uname(1), sysinfo(2), attributes(5), isalist(5) SunOS 5.10 25 Jul 1997 isalist(1)
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