Yadro Vesnin SPEC2006 Flags file

Commands and Options Used to Submit Benchmark Runs

submit = taskset -p -c $BIND $command

Each process was bound to a cpu using submit= with the taskset command
```
 
submit = taskset -p -c $BIND $command
```

taskset - show or change the CPU affinity of a process.

 

Options:
 -p, --pid               operate on existing given pid
 -c, --cpu-list          display and specify cpus in list format

Shell, Environment, and Other Software Settings

Environment variables that can be set before the run:

XLFRTEOPTS=intrinthrds=1 : Causes the Fortran runtime to only use a single thread.

To reserve 200 huge pages out of the physical memory pool, issue the following command,
```
echo 16000 > /proc/sys/vm/nr_hugepages
```
or
```
echo 16000 > /proc/sys/vm/nr_overcommit_hugepages
```
to allocate from the dynamic hugepage pool. This can be done in both Red Hat and Suse Enterprise, since both distributions implements Transparent Huge Pages (THP). THP is an abstraction layer that automates most aspects of creating, managing and using huge pages, and can currently only map anonymous memory regions such as heap and stack space.

Operating System Tuning Parameters

ulimit -s unlimited
Sets the maximum stack size to "unlimited".

Simultaneous Multi-Threading (SMT) mode was set to SMT4

 ppc64_cpu --smt=4

ppc64_cpu command is used to display and set cpu characteristics on PowerPC platforms.

Options:
       --smt  Display  the  current  smt setting for the system. The output will state whether smt is off indicating there is only one thread per core online, smt is on indicating that all threads of every
              core is online, the smt is in a mixed state indicating that the number of threads online varies per core, or SMT=X indicating a specific smt state.
       --smt=value
              Set the smt state for each core to the specified value.

Firmware / BIOS / Microcode Settings

Intelligent Energy Optimizations

Intelligent Energy Optimization capabilities enable the POWER8 processor to operate at a higher frequency for increased performance. This processor / firmware feature maximizes performance as thermal conditions allow and enabled by default in firmware.