Feature/slurm remote support

[mhrtmnn]

This pull request extends the SLURM support of tapasco such that remote compute nodes can be used for carrying out HLS and compose jobs.

The required architecture consist of three networked machines:

• Host (front end):
  Runs a tapasco instance that takes in the user CLI arguments and collects all required files for the selected job (e.g. kernel source files for HLS jobs or IPCores for compose jobs). These dependencies are copied over the network to a separate node referred to as Workstation. The artefacts that are generated by a job (e.g. IPCore for HLS, bitstream for compose) are copied back to the Host once the job finishes.

• Workstation:
  In the simplest case a network attached storage. It is required, since in the general case we cannot directly push files to the SLURM compute node. Thus, the files are deposited in a known directory on this node, and the SLURM compute node can pull the files from here by itself.

• SLURM node (back end):
  Login node to the compute node that has SLURM control tools such as sbatch and squeue installed. The compute node runs its own tapasco instance.

The above setup is configurable through a JSON config file. This PR contains an example file at toolflow/vivado/common/SLURM/ESA.json that describes an ESA internal compute node. Different configurations can be selected via tapasco CLI options at the Host, for example --slurm ESA.

[mhrtmnn]

Executing Tapasco in SLURM mode, e.g. tapasco --slurm ESA hls arraysum -p pynq, assumes a working Tapasco installation on the SLURM node.

Tapasco can be installed via a SLURM job script like the following:

#!/bin/bash -xe
#SBATCH -e       /net/balin/Slurm/SLURM_stderr.txt
#SBATCH -o       /net/balin/Slurm/SLURM_stdout.txt
#SBATCH --output=/net/balin/Slurm/SLURM_output.txt

# Clean install?
# rm -rf /scratch/SLURM/

echo "Check if installation exists"
if [ ! -d "/scratch/SLURM/tapasco" ]
then
	mkdir -p /scratch/SLURM
	cd /scratch/SLURM
	git clone https://github.com/esa-tu-darmstadt/tapasco.git --depth=1
fi

echo "Check if workdir exists"
if [ ! -d "/scratch/SLURM/tapasco_workdir" ]
then
	mkdir -p /scratch/SLURM/tapasco_workdir
	cd /scratch/SLURM/tapasco_workdir
	bash /scratch/SLURM/tapasco/tapasco-init.sh
	source tapasco-setup.sh

	echo "Building toolflow"
	cd ${TAPASCO_HOME_TOOLFLOW}/scala
	./gradlew --project-cache-dir=/tmp -g /tmp installDist
fi
echo "Checking installation"
cd /scratch/SLURM/tapasco_workdir
source tapasco-setup.sh
tapasco --help

Note: Building toolflow via tapasco-build-toolflow does not work, as gradlew will complain about missing write permissions to the home directory.