Re: [EnergyPlus_Support] Speeding up E+ simulation time with ruby script.

[Fred Buhl <wfbuhl@xxxxxxx>]

Nice job, Phylroy. I'll echo Edwin's comments. Generally speaking, EnergyPlus is not particularly
well-suited to parallelization. However some folks have used multiple cpus successfully when doing
optimization.

Fred Buhl

On 12/7/2009 9:06 AM, Edwin Lee wrote:

Phylroy

One issue about this is that there is a history effect carried from one time step to another in EnergyPlus.  If you just re-initialize to a different day of the year, there are a number of transient components in EnergyPlus which will start out with different values than if you ran an annual simulation straight through.  May be fine for whatever case you are wanting, but in many cases, I could see this adding inaccuracy to the simulation. 

On the other hand, an 8x boost sure is appealing though!  If there is little transient effect in the simulation, that is a nice tool.

Edwin

On Mon, Dec 7, 2009 at 11:00, Phylroy <phylroy.lopez@xxxxxxxxx> wrote:

 

Hey,

I just posted a file that will divide the annual simulation period into the number of cpus present on your system and run the slices on separate threads.

All that remains is for you to write a script to sum or append the results together for what you wish to examine.

This has deceased that simulation time by roughly 8x on our 8 core systems.

Here is the script the code is rather straight-foward. You will need ruby installed on your system.

http://f1.grp.yahoofs.com/v1/gCYdS218IhkWpX26bNjiFFvdlaOuFZatdpHi03pCWl_31hFtjHZ3tzRw5Gb3iM-NE73gylgX3i3EtfhMZXp4h3f9F-4GUHJotn8L/Utilities/AnnualSimulationSplitter.rb

Phylroy

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