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Full Discussion: High Performance Computing
Special Forums UNIX and Linux Applications High Performance Computing High Performance Computing Post 302278833 by otheus on Wednesday 21st of January 2009 09:30:23 AM
Old 01-21-2009
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Originally Posted by humbletech99
1. CPU intensive computation of a single task
Q1: What percentage of the operations are floating point? Do you need double-precision? (Usually the answer is yes).

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2. Parallel computation of a task broken down into pieces
What's the expected ratio between computation time and communication time between the pieces. Medium ratio: do some computation, then send intermediate results to all neighbors, then do some more computation. Low ratio: compute, send a result, wait for a message, compute, send a result, and so on. High ratio: the CPUs crunch, crunch, crunch, then finally send results to a central task which does a final computation.

This is important in deciding what kind of network capacity you will need.
[/quote]?

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3. Storage across many commodity nodes with scalability and i/o performance
How about reliability? Commodity nodes means high rate of disk failures and/or node failures. Can you bear with frequent filesystem downtime? Or will you need high availability on this filesystem?

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4. The solutions do not need to be geographically dispersed, same server room is fine.
Does your budget include life operating costs? Does your server room have specifications for lb/ft^2 ? One institution I worked at discovered that the building was designed for a certain amount of weight density -- even in the server room. It turns out that putting more than about 8 computer racks in the room exceeded this density! So we had the room, but adding more racks might make the floor unstable, especially given that this building was in a geographically active area (about 1 4+ quake every 2 to 3 years).
 

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page_util_quote(n)					      Parser generator tools						page_util_quote(n)

__________________________________________________________________________________________________________________________________________________

NAME
page_util_quote - page character quoting utilities SYNOPSIS
package require page::util::quote ?0.1? package require snit ::page::util::quote::unquote char ::page::util::quote::quote'tcl char ::page::util::quote::quote'tclstr char ::page::util::quote::quote'tclcom char _________________________________________________________________ DESCRIPTION
This package provides a few utility commands to convert characters into various forms. API
::page::util::quote::unquote char A character, as stored in an abstract syntax tree by a PEG processor (See the packages grammar::peg::interpreter, grammar::me, and their relations), i.e. in some quoted form, is converted into the equivalent Tcl character. The character is returned as the result of the command. ::page::util::quote::quote'tcl char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser, will regenerate the character in question and is 7bit ASCII. The string is returned as the result of this command. ::page::util::quote::quote'tclstr char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser and will generate a human readable representation of the character in question. The string is returned as the result of this command. The string does not use any unprintable characters. It may use backslash-quoting. High UTF characters are quoted to avoid problems with the still prevalent ascii terminals. It is assumed that the string will be used in a double-quoted environment. ::page::util::quote::quote'tclcom char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser when used within a Tcl comment. The string is returned as the result of this command. BUGS, IDEAS, FEEDBACK This document, will undoubtedly contain bugs and other problems. Please report such in the category page of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have. KEYWORDS
page, parser generator, quoting, text processing COPYRIGHT
Copyright (c) 2007 Andreas Kupries <andreas_kupries@users.sourceforge.net> page 1.0 page_util_quote(n)
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