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Finally, additional optimizations such as buffer management help eliminate other bottlenecks that can reduce performance. Split file processing allows multiple threads to operate concurrently on the same file. Multi-node cooperation allows different nodes to take part in the same task. Double buffering allows individual operations within a single task to be overlapped using asynchronous I/O. Multi-threading is used to ensure that nodes are kept as busy as possible. Mutil is a set of standard utilities that employ multiple types of parallelism and other optimizations to achieve maximum performance on modern file systems. Several existing services have been integrated with Mesh to provide resource discovery and query, high performance file transfer, and job management.

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Mesh uses a remote command model, which is based on stock SSH clients and the syntax and commands already understood by users, thus requires no additional software or knowledge to utilize effectively. Mesh adheres to fundamental security principles and was designed to be compatible with strong security mechanisms including two-factor authentication, SSH bastions, and restrictive firewalls. Resources may be added to a Mesh-based grid in a matter of minutes using just five small files and two environment variable settings. Mesh is a secure, lightweight grid middleware that is based on the addition of a single sign-on capability to the built-in public key authentication mechanism of SSH using system call interposition. FreeMe can also be used in a single-user configuration.

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Original emails are kept in an archive that can be queried on demand. Options include ignoring uninteresting messages, resending messages on demand, or sending them in a consolidated digest format to dramatically reduce the number of messages received. Emails can be processed as they are received in procmail-like fashion or read from an existing inbox.

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It allows each administrator to manage their individual subscriptions with the ability to match full regular expressions against any email field, providing fine-grained filtering. This software is NASA open source.įiltering and Reorganization of Excessive Email Emanation (FreeMe)įreeMe reduces admin email clutter during large-scale outages within HPC environments while highlighting messages of interest. Output associated with the local and remote files is then multiplexed together into the standard unified format associated with the original command to present all files as if they were local. Remote files are processed transparently using a persistent SSH connection to the associated host(s). These internal versions determine if files on the command line are local or remote.

Instead, BASSHFS uses the aliasing and function mechanisms of the bash shell to intercept supported program invocations and remap those to its own versions. This tool is similar SSHFS except it does not require FUSE kernel support.

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This software is NASA open source.īallast details and download links Bash-Accessible SSH File System (BASSHFS)īASSHFS allows users to perform simple tasks on remote file systems as if they were locally mounted. Ballast includes a simple client, a lightweight data server, and a data collection agent. This gives ballast the unique ability to perform user-specific load balancing, which has several benefits including separating users who have historically generated high loads and providing a common login interface to users who may be separated based on other criteria such as system accessibility. Ballast is invoked as part of the SSH login process, hence has access to the user name, which is not available in traditional load balancers. The following NAS-developed software tools can be downloaded for use on your own system.īallast is a tool for balancing user load across SSH servers based on configurable criteria such as CPU load and system availability. This work includes software for scientific visualization, supercomputer benchmarking, computational fluid dynamics, and simulation grid processing. NAS experts develop and adapt software programs to complement and enhance the work performed on our supercomputers.