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Title: Data Formats/File Systems/Parallel - The Galley Parallel File System A filesystem designed for parallel computers. Description of file structure, papers, and source code.
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The Galley Parallel File System
The Galley Parallel File System
Based on the results of several workload
characterization studies we performed, we have designed and
implemented Galley, a new parallel file system that is intended to meet
the needs of parallel scientific applications.
Galley was designed to run on networks of workstations (NOWs) or
parallel supercomputers. It currently runs on networks of IBM RS/6000s
(such as our FLEET Lab) and the IBM SP-2
parallel supercomputer (such as Babbage
at NASA Ames Research Center).
Galley was implemented using a model of distinct Compute Processors and I/O
Processors. That is, the nodes in the network or parallel machine are
partitioned into two sets: one that runs users' applications and one that
runs Galley's I/O servers. Even though most NOWs, and some parallel
machines, have disks on each node, Galley uses the distinct CP/IOP model
since it leads to more predictable performance and reduces the performance
impact that one user's application may have on another.
To use the Galley Parallel File System, a user's application must be linked
with the Galley runtime library. The runtime library establishes
connections with the system's I/O servers, and handles all communication
between the client's code and the servers. When an application makes a call
to a Galley routine, the runtime library converts the request into an
internal format, and passes it on to the I/O servers via message passing.
The runtime library then controls the flow of data from the IOP to the
application's address space, or vice versa.
Features
Support for many common access
patterns
Complete control over parallelism
New three-dimensional file structure
Support for libraries
Asynchronous I/O
Low memory and computational overhead
Designed to be portable
More Information
Three-dimensional file structure
Application interface
Manual pages
Papers
Galley: A New Parallel File System for Parallel Applications.
Ph.D. Thesis.
The Galley Parallel File System.
This paper is a combination of the two papers below, with updated
performance results, and will appear in the journal Parallel
Computing.
The Galley Parallel File System.
Appeared in ICS '96.
Performance of the Galley Parallel File System. Appeared in
IOPADS '96
Galley makes no pretense to be anything but an experimental file system,
and is missing many of the features that would be required in a
'production' file system. Most importantly, Galley does not provide any
sort of security or support for
recovery from IOP crashes ( i.e., fsck).
Source code
The full source code for Galley is now
available for downloading. The code isn't as clean or as fully commented
as I would have liked, but I don't have time to really do a good job on it.
I'm not planning to do any sort of support (unfortunately, this includes
bugfixes), partly since I believe the non-competition clause of my new
employment agreement will prohibit it, and partly because I don't expect
to have time. If somebody else here at Dartmouth takes up the Galley
banner, someone will make an announcement
to that effect.
Finally, if you find this code useful please let me know.
Nils A. Nieuwejaar
nils@cs.dartmouth.edu
Last modified Monday, September 2, 1996
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A | filesystem | designed | for | parallel | computers. | | Description | of | file | structure, | papers, | and | source | code. |
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http://www.cs.dartmouth.edu/~dfk/nils/galley.html
The Galley Parallel File System 2008 August
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A filesystem designed for parallel computers. Description of file structure, papers, and source code.
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