Initial Setup

Prerequisites

• Python 3

• Toil

• Node.js

• Singularity

Python

Iris

module load migration-testing-spack/python/3.10.13

Juno

Install Toil

Option 1 - Install Toil in Python Virtual Environment [Recommended for first time users]

Create a python virtual environment

python3 -m venv venv

This will create python virtual environment folder called venv in your current working directory

Activate the virtual environment

source venv/bin/activate

You need to activate the virtual environment in order to use it. Remeber this command, as you need to do this at the start of any session where you need to use Toil.

Update pip in the virtual environment

pip install --upgrade pip

This step only needs to be done once per virtual environment

Install toil in the virtual environment

Iris

Install latest version of Toil pip install toil[cwl]

Juno

Option 2 - Alternative Installation Methods

An alternative installation method using conda is included with the pluto-cwl repo here.

Resources:

• official installation documentation

Install Node.js

Check if node is installed on your system with which node

If Node is not installed. Create a node folder in your shared workspace (/work/... on juno).

In the node folder run:

wget https://nodejs.org/dist/v17.8.0/node-v17.8.0-linux-x64.tar.xz
tar xvfJ node-v17.8.0-linux-x64.tar.xz
export PATH=$PATH:$PWD/node-v17.8.0-linux-x64/bin

Make sure to add the node path to your .profile so you don't need to load every time you log in to juno. You can get the full node path by running which node

Singularity

Iris

module load migration-testing/singularity/3.7.1

Juno

Setup the singularity cache:

Follow this link to setup the cache:

Setup Singularity cache

Environment Variables

The following environment variables should be set before running a CWL pipeline

Required

• export CWL_SINGULARITY_CACHE=[cache]: as shown above, a directory with read/write access where Singularity containers are cached

• export SINGULARITYENV_LC_ALL=en_US.UTF-8

Recommended

If you have an sla or specific LSF or SLURM requirements, you can configure toil to pass extra arguments to its worker jobs

SLURM

TOIL_SLURM_ARGS: Arguments for sbatch for the SLURM batch system

Example: export TOIL_SLURM_ARGS='--partition test01'

LSF

Optional

The environment variables here are for informative purposes. Not recommended for first time users.

• If you are automatically generating the cwl-cache

  • SINGULARITY_CACHEDIR

  • If you are running a large pipeline you might need to set up dockerhub authentication, so you do not hit the rate limit

    • SINGULARITY_DOCKER_USERNAME: Dockerhub login username

    • SINGULARITY_DOCKER_PASSWORD: Dockerhub login password

Create the demo CWL and yaml file hello.cwl:

#!/usr/bin/env cwl-runner
cwlVersion: v1.0
class: CommandLineTool
baseCommand: ['echo']
stdout: stdout.txt
requirements:
  DockerRequirement:
    dockerPull: alpine:latest

inputs:
  message:
    type: string
    inputBinding:
      position: 1

outputs:
  stdout_txt:
    type: stdout

285B

hello.cwl

Open

hello.yaml

message: Hello world!

The file is also on the file system:

Juno

/juno/work/ci/first_time_setup/hello.cwl

Pull Singularity container and then run the CWL

Iris

1. Insert the toil command into a slurm script, such as hello-world.slurm

#!/bin/bash

#SBATCH --job-name=toil_cwl

#SBATCH --partition=test01        # Replace with the correct partition name

#SBATCH --time=02:00:00            # Wall time (hh:mm:ss)

#SBATCH -o single.%j.out

#SBATCH -e single.%j.err


source venv/bin/activate           # Activate your virtual environment
mkdir singularity_cache
mkdir tmp

#Export queue name

export TOIL_SLURM_ARGS='--partition test01' ;



# Navigate to your workflow directory (if needed)

#cd /path/to/your/workflow



# Run your workflow

export TMPDIR=$PWD/tmp
export CWL_SINGULARITY_CACHE=$PWD/singularity_cache
export SINGULARITYENV_LC_ALL=en_US.UTF-8



toil-cwl-runner \
--batchSystem slurm \
--jobStore file:job-store-name \
--singularity \
--disableCaching \
--logFile cwltoil.log \
--logDebug \
--preserve-environment SINGULARITY_DOCKER_USERNAME SINGULARITY_DOCKER_PASSWORD TMPDIR \
--outdir hello-world \
hello.cwl hello.yaml

1. Run command sbatch hello-world.slurm

2. The standard output and standard error are directed to single.%j.out and single.%j.err where "%j" is replaced by the job number

Juno

If you get the response Hello World, you are all set! Congrats you finished your first cwl run!