Welcome to the Scyld ClusterWare HPC User's Guide. This manual is for those who will use ClusterWare to run applications, so it presents the basics of ClusterWare parallel computing — what ClusterWare is, what you can do with it, and how you can use it. The manual covers the ClusterWare architecture and discusses the unique features of Scyld ClusterWare HPC. It will show you how to navigate the ClusterWare environment, how to run programs, and how to monitor their performance.

Because this manual is for the user accessing a ClusterWare system that has already been configured, it does not cover how to install, configure, or administer your Scyld cluster. You should refer to other parts of the Scyld documentation set for additional information, specifically:

Also not covered is use of the Linux operating system, on which Scyld ClusterWare is based. Some of the basics are presented here, but if you have not used Linux or Unix before, a book or online resource will be helpful. Books by O'Reilly and Associates are good sources of information.

This manual will provide you with information about the basic functionality of the utilities needed to start being productive with Scyld ClusterWare.


We welcome any reports on errors or difficulties that you may find. We also would like your suggestions on improving this document. Please direct all comments and problems to

When writing your email, please be as specific as possible, especially with errors in the text. Please include the chapter and section information. Also, please mention in which version of the manual you found the error. This version is Scyld ClusterWare HPC, First Edition, published October 2006.