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I want to know is it possible to combine processing power of two or more system and if yes than how can we do it?
for example two systems with Pentium 4 processor 2.66 ghz combine there processing power
Well, it is certainly possible to combine their power consumptions...
Whether a task is parallelisable is to an extent a function of data dependencies (well, independent tasks are. independent and don't thus fall prey to data dependencies, but that doesn't always help as much as you might think).
Which will use more power and be slower than a more modern dual-core. A current quad/hexa core would be tons faster. Clustering makes sense in some situations, but not (IMO) with P4s, or other old, slow, single core systems.
Agreed. Not to mention the fact that unless the app you're trying to run is written/compiled to take advantage of a cluster/parallel system, it probably won't run much faster to start with.