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[EnergyPlus_Support] Re: Multi-threading EnergyPlus
Thank you for all your responses, much appreciated.
I thought I would add a bit more background to the discussion.
Until now I have run multiple, concurrent simulations using multiple
E+ installations. This is of course run on a multi-cored machine.
The trouble comes when I only have one large simulation. My only
option until now is to split up the 12 month simulation into multiple
parts (eg Jan-Feb, Mar-Apr etc), run each as a separate thread and
combine the results. This method has its inefficiencies and is only
scalable to a relatively small number of threads. Hence the reason for
the original post.
I guess this leaves me with 2 questions:
1. Is it possible (or worth) obtaining the source code and compiling
the software for native multi-threading? Does the code lend itself to
such a compilation?
2. If the answer is no, are there any further ideas as to how to
create a "simulated" multi-threaded environment similar to the one I
mentioned above?
Thanks again
Andrew
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Bing Dong"
<bingcat2007@...> wrote:
>
> We also find the same phenomena when we are running on a four-core
server.
>
> On Tue, May 6, 2008 at 11:37 PM, Crawley, Drury <Drury.Crawley@...>
> wrote:
>
> > EnergyPlus only runs a single thread--no multithreading (yet).
> >
> > But I recently went from a single core 1.8 GHz machine (with 1 GB
> > memory) to a dual-core 1.2 GHz PC (with 2 GB memory). The set of
> > example files ran almost twice as fast on the new dual-core PC. Two
> > reasons--the extra memory and the unloaded second core.
> >
> > ________________________________
> >
> > From:
EnergyPlus_Support@xxxxxxxxxxxxxxx<EnergyPlus_Support%40yahoogroups.com>
> >
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx<EnergyPlus_Support%40yahoogroups.com>]
> > On Behalf Of Bing Dong
> > Sent: Tuesday, May 06, 2008 11:22 PM
> > To:
EnergyPlus_Support@xxxxxxxxxxxxxxx<EnergyPlus_Support%40yahoogroups.com>
> > Subject: Re: [EnergyPlus_Support] Multi-threading EnergyPlus
> >
> >
> > I believe that NREL is running E+ on clusters.
> >
> > Bing
> >
> > On Tue, May 6, 2008 at 8:49 PM, Edwin Lee
<leeed2001@...<leeed2001%40gmail.com>
> > <mailto:leeed2001%40gmail.com <leeed2001%2540gmail.com>> > wrote:
> >
> > > As far as I know, (and I will in no way claim to be an expert in the
> > > subject), the calculation engine in E+ (successive substitution)
does
> > not
> > > gain anything from being run on multiple cores of a pc or a pc
> > cluster. In
> > > a program like Fluent, the domain can be broken into separate
chunks,
> > and
> > > only data at each boundary need be communicated. For E+, information
> > is
> > > flying all over the place. One thing people use multiple
computers for
> > is
> > > to start multiple instances of E+ to run multiple simulations at the
> > same
> > > time.
> > >
> > > If anyone out there has any more to say, please fill in the gaps or
> > > correct
> > > me - or back me up :) -
> > >
> > > Edwin
> > >
> > > On Tue, May 6, 2008 at 7:13 PM, andrew.tsakmakis <
> > > andrew.tsakmakis@... <andrew.tsakmakis%40arup.com> <mailto:
> > andrew.tsakmakis%40arup.com <andrew.tsakmakis%2540arup.com>>
> > <andrew.tsakmakis%40arup.com>>
> > > wrote:
> > >
> > >
> > > > Hello,
> > > >
> > > > Is there a pre-compiled, multi-threaded version of EnergyPlus for
> > use
> > > > on multicore PC's or clusters available? (preferably windows but
> > could
> > > > be linux)
> > > >
> > > > Many Thanks
> > > > Andrew
> > > >
> > > >
> > > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
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