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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.
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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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PMWHICHCONTEXT(3)					     Library Functions Manual						 PMWHICHCONTEXT(3)

NAME
pmWhichContext - identify the current PMAPI context C SYNOPSIS
#include <pcp/pmapi.h> int pmWhichContext(void); cc ... -lpcp DESCRIPTION
An application using the Performance Metrics Application Programming Interface (PMAPI) may manipulate several concurrent contexts, each associated with a source of performance metrics, e.g. pmcd(1) on some host, or an archive log of performance metrics as created by pmlog- ger(1). pmWhichContext returns a handle for the current PMAPI context, that may be used in the associated PMAPI routines that require a handle to identify a PMAPI context. SEE ALSO
PMAPI(3), pmDestroyContext(3), pmDupContext(3), pmNewContext(3) and pmUseContext(3). DIAGNOSTICS
PM_ERR_NOCONTEXT no current context Performance Co-Pilot PCP PMWHICHCONTEXT(3)
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