Freedom251 › GPU Cluster Management Software

HTCondor

Free plan APILinuxMacSelf-hostedWebWindows

What HTCondor is

HTCondor coordinates networked machines to run submitted computing jobs, including large batches such as thousands of runs across multiple data sets. It finds available machines, can use otherwise idle machines in a pool, and can restart a job elsewhere if its current machine becomes unavailable. ClassAds match machine resource offers with each job’s requirements and preferences. Users do not need login accounts on the machines running their jobs; file transfers and split execution support that access model. HTCondor can draw on clusters, cloud resources, and international grids, and flocking can connect multiple installations. It supports transfers to and from S3-compatible storage, including Google Cloud Storage through its S3 interoperability API, but not whole buckets or directories. The software is free under Apache License 2.0 and supports Linux, macOS, and Windows, as well as web, API, and self-hosted use. It includes Python bindings and user and administrator guides. Community support is available through a mailing list; fee-based contract support offers guaranteed resolution and faster turnaround.

Who it suits

HTCondor suits academic, government, and commercial organizations managing computational workloads across pools of networked machines. Its job scheduling and resource options may be useful for teams running repeated workloads over multiple data sets.

What it does well

Can restart jobs when a machine becomes unavailable
ClassAds match machine offers to job needs
Users need no login on execution machines
Supports S3-compatible file transfers
Includes Python bindings and administrator guides

What to know first

Cannot transfer whole storage buckets or directories
Freemium API keys do not access the API
Contract support is fee-based

Getting started

Visit https://htcondor.com/ and review the download information.
Choose a feature release or an LTS release.
Use the platform that fits your deployment: Linux, macOS, Windows, web, API, or self-hosted.
Consult the user or administrator quick-start guide, or the manual.

Verdict

HTCondor is suited to coordinating jobs across machines without requiring users to log in to each execution machine. Its storage-transfer limit and the need to purchase API access are important considerations.

Questions

Is HTCondor free?

Yes. Its pricing model is free, with a free plan and no free trial.

Which platforms does HTCondor support?

The listed platforms are API, Linux, macOS, self-hosted, web, and Windows.

Is HTCondor open source?

The HTCondor Software Suite is licensed under Apache License, Version 2.0.

What support is available?

Free, community-based best-effort support is available through the htcondor-users mailing list. Fee-based internal support offers guaranteed problem resolution, faster turnaround, telephone access, and a high-priority email address.

Can HTCondor transfer files to cloud storage?

It supports transfers to and from S3-compatible storage, including Google Cloud Storage through its S3 interoperability API. It does not transfer entire buckets or directories.

Where is HTCondor based?

Its headquarters are in Madison, Wisconsin, United States.

Facts from HTCondor's own pages

Access model: HTCondor does not require users to have a login account on the machines where their jobs run, using file transfer and split execution mechanisms. · htcondor.com, 30 Sept 2026
Audience: The site says HTCSS is used by academic, government, and commercial organizations to manage computational workloads. · htcondor.com, 30 Sept 2026
Cloud and grid use: The overview says HTCondor can use clusters, cloud resources, or international grids, and the product page describes flocking multiple HTCondor installations together. · htcondor.org, 29 Sept 2026
Cloud storage integration: HTCondor supports file transfers to and from S3-compatible storage, including Google Cloud Storage through its S3 interoperability API, but does not support transferring entire buckets or directories. · htcondor.readthedocs.io, 29 Sept 2026
Community support: Free, community-based best-effort support is available through the htcondor-users mailing list. · htcondor.org, 29 Sept 2026
Contract support: Fee-based internal support offers guaranteed problem resolution, faster turnaround, telephone access, and a high-priority email address. · htcondor.org, 29 Sept 2026
Documentation: The site provides user and administrator quick-start guides and a manual that can be viewed online or downloaded. · htcondor.com, 30 Sept 2026
Execution model: HTCondor can run jobs without requiring users to have login accounts on the machines where the jobs run. · htcondor.org, 29 Sept 2026
Headquarters: Madison, Wisconsin, United States · htcondor.com, 28 Sept 2026
HTCondor-CE integration: HTCondor-CE supports Grid Engine, HTCondor, LSF, PBS Pro, Torque, and Slurm as local batch systems. · htcondor.com, 30 Sept 2026
Job scheduling: Users submit jobs to HTCondor, which finds available machines and starts running the jobs there. · htcondor.com, 30 Sept 2026
License: HTCondor Software Suite is licensed under Apache License, Version 2.0. · htcondor.org, 29 Sept 2026
Platforms: The product page says Linux, macOS, and Windows are supported. · htcondor.org, 29 Sept 2026
Purpose: HTCondor creates a High-Throughput Computing environment by using the computing power of networked machines, clusters, cloud resources, and international grids. · htcondor.com, 30 Sept 2026
Python: The site says HTCondor comes with Python bindings. · htcondor.com, 30 Sept 2026
Recovery: If a machine running a job becomes unavailable, HTCondor can automatically restart the job on another machine. · htcondor.com, 30 Sept 2026
Release channels: The download page describes feature releases for new features and bug fixes, and LTS releases for bug fixes to a fixed feature set. · htcondor.com, 30 Sept 2026
Resource matching: HTCondor uses ClassAds to match and rank resource offers against job requests, considering resource properties and priority values. · htcondor.com, 30 Sept 2026
Scale: The overview describes using HTCondor to submit many jobs at once, including thousands of runs across multiple data sets. · htcondor.org, 29 Sept 2026
Security support: HTCondor provides security fixes for the current feature version and current LTS version, and supports the previous LTS for approximately twelve months after a new LTS release. · htcondor.com, 30 Sept 2026
Security updates: The security page says fixes are provided for the current feature and LTS versions and, after a new LTS release, for the previous LTS version for approximately twelve months. · htcondor.org, 29 Sept 2026
Upgrade limits: The site says older LTS channels eventually stop receiving additional bug fixes and that changing to a new LTS feature set requires a manual decision. · htcondor.com, 30 Sept 2026
Vulnerability reporting: The security page asks people to report suspected or confirmed vulnerabilities to [email protected] and says the team will coordinate a disclosure timeline with the reporter. · htcondor.com, 30 Sept 2026
Workload scale: HTCondor is useful for running jobs thousands of times across different data sets, and can run jobs on otherwise idle machines in the pool. · htcondor.com, 30 Sept 2026

Where HTCondor stands on Freedom251

GPU Cluster Management Software#7 of 21