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The sales pitch for grid is faster it, more efficient computing, the idea that i wont have computers with 3% utiization in my grid/server estate.

It’s application dependent. Let’s say you’ve taken the desktop risk calculations and put them on the grid.  When the trader presses calculate, a small job is sent to the grid, and the results sent back to the desktop.  On that basis you’re only using it during normal business hours, at night it might be idle. 

In order to get the full benefit of grid, you need to load it up, use it for numerous applications running at different times, if you don’t you’ll be supporting/paying for a grid that has low utilization and by doing the maths becomes an expensive exercise. 

This could mean you take the desktop calculation during the day and put them on grid, your overnight risk reports, coupled with your settlement transacations, put them all on grid, you’ve now got three applications running throughout the day, keeping it busy, funding the infrastructure.  If when in use it’s not at 100%, that’s not the end of the world, you’ve got spare capacity, you need to leave room for growth anyway, an evolving process..

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