job-features.md

# Job Features

Special features installed/configured on the fly on allocated nodes, features are requested in PBS job.

```console
$ qsub... -l feature=req
```

## VTune Support

Load VTune kernel modules.

```console
$ qsub ... -l vtune=version_string
```

version_string is VTune version e.g. 2017_update2

## MIC Development Support

Install development packages (gcc, g++, make, automake, autoconf, bison, flex, perl, libraries, ...) on MIC accelerators.

```console
$ qsub ... -l mic_devel=true
```

!!! Warning
    Available on Salomon Perrin nodes.

## Global RAM Disk

Create global shared file system consisting of RAM disks of allocated nodes. File-system is mounted on /mnt/global_ramdisk.

```console
$ qsub ... -l global_ramdisk=true
```

!!! Warning
    Available on Salomon nodes only.

## Virtualization Network

Configure network for virtualization, create interconnect for fast communication between node (host) and virtual machine (guest).

```console
$ qsub ... -l virt_network=true
```

[See Tap Interconnect][1]

## x86 Adapt Support

Load kernel module, that allows changing/toggling system parameters stored in MSR and PCI registers of x86 processors.

```console
$ qsub ... -l x86_adapt=true
```

!!! Danger
    Hazardous, it causes CPU frequency disruption.

!!! Warning
    Available on Salomon nodes only.

## Disabling Intel Turbo Boost on CPU

Intel Turbo Boost on CPU is enabled on all all compute nodes.

To disable Intel Turbo Boost on CPU

```console
$ qsub ... -l cpu_turbo_boost=false
```

## Offlining CPU Cores

!!! Info
    Not available now.

To offline N CPU cores

```console
$ qsub ... -l cpu_offline_cores=N
```

To offline CPU cores according pattern

```console
$ qsub ... -l cpu_offline_cores=PATTERN
```

where pattern is list of core's numbers to offline separated by character 'c' e.g. "5c11c16c23c"

!!! Danger
    Hazardous, it causes Lustre threads disruption.

[1]: software/tools/virtualization.md#tap-interconnect