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likwid-features - Online in the Cloud

Run likwid-features in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command likwid-features that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

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

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