xenial (1) likwid-features.1.gz

Provided by: likwid_3.1.3+dfsg1-1_amd64 bug

NAME

       likwid-features - print and toggle the flags of the MSR_IA32_MISC_ENABLE model specific register

SYNOPSIS

       likwid-features [-vh] [-c <coreId>] [-s <prefetcher_tag>] [-u <prefetcher_tag>]

DESCRIPTION

       likwid-features  is  a  command  line application to print the flags in the model specific register (MSR)
       MSR_IA32_MISC_ENABLE on Intel x86 processors. On Core2 processors it can be used to toggle  the  hardware
       prefetch  flags.  It  does  not  work on AMD processors.  For a documentation what flags are supported on
       which processor refer to the Intel Software Developer's Manual Volume 3B, Table  B.2.  The  MSR  are  set
       individually for every core.  The following hardware prefetchers can be toggled:

       •      HW_PREFETCHER: Hardware prefetcher.

       •      CL_PREFETCHER: Adjacent cache line prefetcher.

       •      DCU_PREFETCHER:  When  the  DCU prefetcher detects multiple loads from the same line done within a
              time limit, the DCU prefetcher assumes the next line will be required. The next line is prefetched
              in to the L1 data cache from memory or L2.

       •      IP_PREFETCHER:  The  IP  prefetcher  is  an  L1 data cache prefetcher. The IP prefetcher looks for
              sequential load history to determine whether to prefetch the next expected data into the L1  cache
              from memory or L2.

OPTIONS

       -v     prints version information to standard output, then exits.

       -h     prints a help message to standard output, then exits.

       -c  <coreId>
              set on which processor core the MSR should be read

       -u  <HW_PREFETCHER | CL_PREFETCHER | DCU_PREFETCHER | IP_PREFETCHER>
              specify which prefetcher to unset

       -s  <HW_PREFETCHER | CL_PREFETCHER | DCU_PREFETCHER | IP_PREFETCHER>
              specify which prefetcher to set

AUTHOR

       Written by Jan Treibig <jan.treibig@gmail.com>.

BUGS

       Report Bugs on <http://code.google.com/p/likwid/issues/list>.

SEE ALSO

       likwid-perfctr(1), likwid-pin(1), likwid-powermeter(1), likwid-topology(1), likwid-setFrequencies(1)