turboblast 2026.3.9.post3

client to launch submitit slurm batch processing on HPC

turboblast

Purpose

turboblast is a Python library for submitting high-throughput job arrays to a Slurm cluster using submitit. It is designed for workflows where you have a large list of command-line tasks (e.g. processing satellite files) that need to be distributed across many compute nodes in parallel.

The core idea is simple: you provide a text file where each line is a set of arguments, and turboblast dispatches each line as an independent Slurm task running a bash script of your choice. Large input lists are automatically split into chunks of 1000 to stay within Slurm array limits.

Dependencies

Package	Role
submitit	Submits and monitors Slurm job arrays from Python
Python ≥ 3.10	Required runtime

Installation

pip install turboblast

Or with conda:

conda install -c conda-forge turboblast

Usage

Prepare your inputs

Create a plain text file where each line contains the arguments for one task:

# inputs.txt
--input /data/file_001.nc --output /results/
--input /data/file_002.nc --output /results/
--input /data/file_003.nc --output /results/

Write your bash script

turboblast will call bash your_script.sh <args> for each line. Example:

#!/bin/bash
# process.sh
python my_processor.py "$@"

Submit the job array

turboblaster \
  --listing-input inputs.txt \
  --bash-slurm-exec process.sh \
  --slurm-partition gpu \
  --timeout-min 60 \
  --mem-gb 8 \
  --cpus-per-task 4 \
  --slurm-array-parallelism 50 \
  --output-dir submitit_logs

Full CLI reference

usage: turboblaster [-h] [--num-tasks NUM_TASKS] [--timeout-min TIMEOUT_MIN]
                    [--mem-gb MEM_GB] [--cpus-per-task CPUS_PER_TASK]
                    [--slurm-partition SLURM_PARTITION]
                    --listing-input LISTING_INPUT
                    --bash-slurm-exec BASH_SLURM_EXEC
                    [--output-dir OUTPUT_DIR]
                    [--slurm-array-parallelism SLURM_ARRAY_PARALLELISM]

options:
  --listing-input            Path to a file containing input lines (one task per line) [required]
  --bash-slurm-exec          Path to the bash script to execute for each task [required]
  --num-tasks                Number of tasks (unused if reading from file) [default: 20]
  --timeout-min              Timeout in minutes for each task [default: 20]
  --mem-gb                   Memory in GB for each task [default: 2]
  --cpus-per-task            Number of CPUs per task [default: 1]
  --slurm-partition          Slurm partition to use [default: cpu]
  --output-dir               Directory to store submitit logs [default: submitit_logs_array]
  --slurm-array-parallelism  Max number of tasks running concurrently [default: 20]

Submitit logs (.out / .err files) are written to a timestamped subdirectory under --output-dir:

submitit_logs/
└── 20260309T143000/
    ├── 12345_0_0.out
    ├── 12345_1_0.out
    └── ...

Monitor a specific task with:

tail -f submitit_logs/20260309T143000/12345_0_0.out

Project structure

turboblast/
├── src/
│   └── turboblast/
│       ├── __init__.py       # Package entry point, exposes __version__
│       ├── blaster.py        # Core logic: argument parsing, job submission, task execution
│       └── logo.py           # ASCII art logo used in the CLI help message
├── tests/
│   ├── test_package.py       # Package metadata tests (version check)
│   └── test_blaster.py       # Unit tests for blaster.py
├── pyproject.toml            # Build config, dependencies, tool settings
└── README.md