- Condor High-Throughput Computing System
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Condor Developer(s) University of Wisconsin–Madison Stable release 7.6.4 Stable / October 24, 2011 Preview release 7.7.2 / October 12, 2011 Operating system Microsoft Windows, Mac OS X, Linux Type High-Throughput Computing License Apache License 2.0 Website Official website Condor is an open source high-throughput computing software framework for coarse-grained distributed parallelization of computationally intensive tasks.[1] It can be used to manage workload on a dedicated cluster of computers, and/or to farm out work to idle desktop computers — so-called cycle scavenging. Condor runs on Linux, Unix, Mac OS X, FreeBSD, and contemporary Windows operating systems. Condor can seamlessly integrate both dedicated resources (rack-mounted clusters) and non-dedicated desktop machines (cycle scavenging) into one computing environment.
Condor is developed by the Condor team at the University of Wisconsin–Madison and is freely available for use. Condor follows an open source philosophy (it's licensed under the Apache License 2.0)[2]. It can be downloaded from their Web site or by installing the Fedora Linux Distribution. It is also available on other platforms, like Ubuntu from the repositories.
By way of example, the NASA Advanced Supercomputing facility (NAS) Condor pool consists of approximately 350 SGI and Sun workstations purchased and used for software development, visualization, email, document preparation, etc. [3] Each workstation runs a daemon that watches user I/O and CPU load. When a workstation has been idle for two hours, a job from the batch queue is assigned to the workstation and will run until the daemon detects a keystroke, mouse motion, or high non-Condor CPU usage. At that point, the job will be removed from the workstation and placed back on the batch queue.
Condor can run both sequential and parallel jobs. Sequential jobs can be run in several different "universes", including "vanilla" which provides the ability to run most "batch ready" programs, and "standard universe" in which the target application is re-linked with the Condor I/O library which provides for remote job I/O and job checkpointing. Condor also provides a "local universe" which allows jobs to run on the "submit host".
In the world of parallel jobs, Condor supports the standard MPI and PVM (Goux, et al. 2000) in addition to its own Master Worker "MW" library for extremely parallel tasks.
Condor-G allows Condor jobs to use resources not under its direct control. It is mostly used to talk to Grid and Cloud resources, like pre-WS and WS Globus, Nordugrid ARC, UNICORE and Amazon EC2. But it can also be used to talk to other batch systems, like Torque/PBS and LSF. Support for Sun Grid Engine is currently under development as part of the EGEE project.
Condor supports the DRMAA job API. This allows DRMAA compliant clients to submit and monitor Condor jobs. The SAGA C++ Reference Implementation provides a Condor plug-in (adaptor), which makes Condor job submission and monitoring available via SAGA's Python and C++ APIs.
Other Condor features include "DAGMan" which provides a mechanism to describe job dependencies.
Condor is one of the job scheduler mechanisms supported by GRAM (Grid Resource Allocation Manager), a component of the Globus Toolkit.
Condor was the scheduler software used to distribute jobs for the first draft assembly of the Human Genome.
Whilst Condor makes good use of unused computing time, leaving computers turned on for use with Condor will increase energy consumption and associated costs. The University of Liverpool[4] has demonstrated an effective solution for this problem using a mixture of Wake-on-LAN and commercial power management PowerMAN (Software).[5]. Starting from version 7.1.1, Condor can hibernate and wake machines based on user-specified policies without the need for third-party software[6].
See also
References
- ^ Thain, Douglas; Tannenbaum, Todd; Livny, Miron (2005). "Distributed Computing in Practice: the Condor Experience". Concurrency and Computation: Practice and Experience 17 (2–4): 323–356. doi:10.1002/cpe.938. http://www.cs.wisc.edu/condor/doc/condor-practice.pdf.
- ^ Condor License Agreement
- ^ Condor Testimonials of High Throughput Computing
- ^ University of Liverpool Condor Project
- ^ University of Liverpool case study with Data Synergy PowerMAN software
- ^ Release notes for Condor v7.1.1
External links
Categories:- Free software programmed in C++
- Parallel computing
- Grid computing
- Job scheduling
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