SPEC OMP2012 Platform Settings for HP Integrity Intel-based systems

Operating System Tuning Parameters

OS Tuning

submit= MYMASK=`printf '0x%x' \$((1<<\$SPECCOPYNUM))`; /usr/bin/taskset \$MYMASK $command

When running multiple copies of benchmarks, the SPEC config file feature submit is sometimes used to cause individual jobs to be bound to specific processors. This specific submit command is used for Linux. The description of the elements of the command are:

ulimit -s [n | unlimited] (Linux)

Sets the stack size to n kbytes, or unlimited to allow the stack size to grow without limit.

vm.max_map_count=-n (Linux)

The maximum number of memory map areas a process may have. Memory map areas are used as a side-effect of calling malloc, directly by mmap and mprotect, and also when loading shared libraries.

Performance Governors (Linux)

The in-kernel CPU frequency governors are pre-configured power schemes for the CPU. The CPUfreq governors use P-states to change frequencies and lower power consumption. The dynamic governors can switch between CPU frequencies, based on CPU utilization to allow for power savings while not sacrificing performance.

For the Performance Governor the CPU frequency is statically set to the highest possible for maximum performance.

On SUSE SLES 11 and 12 systems you can set the in-kernel CPU frequency governor for all CPUs to the Performance Governor with the following command:

Firmware / BIOS / Microcode Settings

Firmware Settings

One or more of the following settings may have been set. If so, the "Platform Notes" section of the report will say so; and you can read below to find out more about what these settings mean.

Intel Hyperthreading Options (Default = Enabled):

This feature allows enabling/disabling of logical processor cores on processors supporting Intel's Hyper-Threading Technology. This option may improve overall performance for applications that will benefit from higher processor core count.

Intel Turbo Boost Technology (Turbo) (Default = Enabled):

Turbo Boost Technology enables the processor to transition to a higher frequency than the processor's rated speed if the processor has available power and is within temperature specifications. Disabling this option reduces power usage and also reduces the system's maximum achievable performance under some workloads.

Memory RAS Configuration (Default = RAS):

This option controls the configuration of memory reliability, availability and serviceability (RAS) features. When setting this option to Maximum Performance system performance is optimized. When setting this option to RAS (also known as lockstep mode) system reliability is enhanced with a degree of memory redundancy.