Overview

• Benefits nf-core institutional profiles
• Information to gather before writing
• Step-by-step example of profile
• How to test a draft profile

Today

🏫 Global institutional profile: a Nextflow configuration file usable by all nf-core pipelines to work efficiently on institutional-level cluster(s). Stored on nf-core/configs.

• Pipeline institutional profiles: future bytesize

Why use?

• 🚀 efficiency: computing resource, time
• 🛄 portable: assists reproducibility
• ⌚ saves time: write it once, everyone benefits

Recap

General info about nf-core & configs: bytesize #2

📄 Nextflow configuration file: simple text file containing a set of properties (parameters, etc.)

• Different levels!
  • ./nextflow.config
  • $HOME/.nextflow/config
  • -c
  • nf-core profiles: nf-core/configs

Example:

nextflow run nf-core/eager -profile uppmax

nextflow run nf-core/eager -profile shh,sdag

nextflow run nf-core/mag -profile shh,sdag

order matters: furthest right has precedence!

Preparation!

Topics to cover

1. 📛 names
2. 🛑 resource limits
3. 📆 scheduling systems
4. 📦 containers

Names

• 📛 Do you have recognisable and descriptive name?
  • Short is good (abbreviations OK!)
  • Precise but compact

Resource limits

• To effectively use nf-core retry ✨:

  • 💾 Largest node's memory

  • 💻 Largest node's CPU

  • ⌚ Longest queue's walltime

  • 📁 Scratch usage?

Scheduling systems

• For Nextflow to submit for you:
  • 📅 What scheduler (check Nextflow docs!)?
  • 🐍 Queues/partitions?
  • 🛑 Submission limits?
  • 🛠️ Additional configurations (e.g. module load)?

Containers

• For robust reproducibility:
  • 📦 Which container engine (check nf-core docs!)?
  • 📁 Common cache locations?
  • 🛠️ Additional parameters?

Writing!

To start

• 🍴 Fork nf-core/configs
• 🌲 Make a branch
• 📖 Open Nextflow documentation

To start

• ✍🏽 Create two new files:
  • conf/<your_cluster>.conf
  • docs/<your_cluster>.md
• 📛 Add profile name to:
  • nfcore_custom.config
  • README.md
  • .github/workflows/main.yml

Scope: params

params {
  config_profile_description = '<cluster_name> cluster profile provided by nf-core/configs.'
  config_profile_contact = '<your_name> (<your_github_handle>)'
  config_profile_url = 'https://<institutional_url>.com'
  max_memory = 2.TB
  max_cpus = 128
  max_time = 720.h
  igenomes_base = '/<path>/<to>/igenomes/' // optional!
}

In conf/<your_cluster>.conf

Scope: process

Simple example

process {
  executor = 'slurm'
  maxRetries = 2
}

Complex example

process {
  executor = 'sge'
  queue = { task.time <= 2.h ? 'short' : task.time <= 24.h ? 'medium': 'long'
  maxRetries = 2
  clusterOptions = { '-l h_vmem=${task.memory.toGiga()}G' }
}

In conf/<your_cluster>.conf

Scope: executor

executor {
  queueSize = 8
  submitRateLimit = '10 sec'
}

In conf/<your_cluster>.conf

Scope: container

singularity {
  enabled = true
  autoMounts = true
  cacheDir = '/<path>/<to>/<your>/<image_cache>'
}

In conf/<your_cluster>.conf

Scope: profiles

<...>

profiles {
  red {
    params {
      config_profile_description = '<your_institution_name> 'red' cluster cluster profile provided by nf-core/configs.'
      max_memory = 2.TB
      max_cpus = 128
      max_time = 720.h
    }
  }

  blue {
    params {
      config_profile_description = '<your_institution_name> 'blue' cluster profile provided by nf-core/configs.'
      max_memory = 256.GB
      max_cpus = 64
      max_time = 24.h
    }
  }
}

(Or use hostnames )
In conf/<your_cluster>.conf

Documentation!

What to include?

• 🗺️ Where the cluster is based
• 🛑 Summary of parameters
  • e.g. resource limits, queues
• 👨‍💻 Instructions for user-level configuration
  • e.g. cache directories
• 🖧 Available 'sub'-profiles

In docs/<your_cluster>.md

Testing and submission!

Test profile from your fork

nextflow run nf-core/<fav_pipeline> \
-profile <your_cluster_name>,test \
--custom_config_base 'https://raw.githubusercontent.com/<your_github_user>/configs/<your_branch>'

⚠️ Expect trial and error!

Submit to nf-core/configs!

• 📑 Make a PR to nf-core/configs

• 📢 On slack: #request-review

• 🥳 Once approved, merge, and publicise!

• 👩🏼‍💻 From now on:

  ​​​​nextflow run nf-core/<fav_pipeline> \
  ​​​​-profile <your_cluster_name>
  ​​​​<...>