Added file job-features.md

docs.it4i/job-features.md

+# Job features
+
+Special features installed/configured on the fly on allocated nodes, features are requested in PBS job.
+qsub ... -l feature-name=req
+
+## VTune support
+Load VTune kernel modules.
+```console
+qsub ... -l vtune=version_string
+```
+where version is VTune version e.g. 2017_update2
+
+
+## MIC development support
+Available on Salomon Perrin nodes.
+Install development packages (gcc, g++, make, automake, autoconf, bison, flex, perl, libraries, ...) on MIC accelerators.
+```console
+qsub ... -l mic_devel=true
+
+## Global RAM disk
+Available on Salomon Perrin nodes.
+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
+```
+
+
+## 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 https://docs.it4i.cz/anselm/software/virtualization/#tap-interconnect
+
+
+## x86 Adapt Support
+Available on Salomon Perrin nodes.
+Load kernel module, that allows changing/toggling system parameters stored in MSR and PCI registers of x86 processors.
+```console
+qsub ... -l x86_adapt=true
+```
+Dangerous, it causes CPU frequency disruption.
+
+
+## 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
+Not available.
+
+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"
+
+
+## Setting Intel Hyper Threading on CPU
+Not available, requires changed BIOS settings.
+Intel Hyper Threading is disabled by default.
+
+To enable Intel Hyper Threading on allocated nodes CPUs
+```console
+qsub ... -l cpu_hyper_threading=true
+```
+