Re: PipsiCAD3D memory limit

From: Bertrand H. Biritz <>
Date: Wed, 26 Jan 2011 21:58:59 -0500

Hello Chris,

Thank you for the prompt and very helpful reply!

I will use the energy cuts from the Pipsicad_SimpleGeo program to hopefully decrease the number of tracks.
We are pretty much containing the lower energy spectrum and will be more interested in the tracks which
punch through our first layer of shielding.


On Jan 26, 2011, at 5:43 AM, Chris Theis wrote:

> Hello Bertrand,
> the limitation actually comes from the operating system& CPU architecture. Let's say that you have for example 4GB memory in your system but in reality what is available is significantly less because of several factors. On one hand you have to subtract any shared RAM used by your graphics adapter and maybe some additional hardware requiring RAM. Thus, what you eventually get is usually< 3GB which is available. Under 32 bit Windows there is the current limit of a maximum of 2GB per user program. So in the end you will exceed this limit with the data file that you want to load. More details can be found at (
> In order be able to use more memory you will have to use a 64 bit Windows version which can address more memory. However, the 32 bit version of the software will still have an upper limit of 4GB because of the operating system. In order to be able to use>4GB you would need a 64 bit OS + a 64-bit native version of SimpleGeo& the plugins.
> To address your problem there are basically two things you can do at this moment: on one hand I can provide you with a version that, due to some tricks, allows for using up to 3GB memory under 32 bit Windows. However, you should keep in mind that this is the max. amount and usually you have other programs running in parallel which require memory as well. In addition you could use the Linux program that creates the data files in order to apply filters (e.g. on the energy range) to create smaller data files.
> Hope that helps
> Chris
>> -----Original Message-----
>> From: [mailto:owner-fluka-
>>] On Behalf Of Bertrand H. Biritz
>> Sent: 25 January 2011 22:49
>> To: fluka-discuss
>> Subject: PipsiCAD3D memory limit
>> Dear Fluka users,
>> I am running a simulation with 10,000 initial events where the .tracks files are
>> around 1.9 GB. When I try to load one into the PipsiCAD3D SimpleGeo plugin I
>> eventually get an "out of memory" error message and then file is not loaded.
>> I initially thought this was because I only had 2GB of RAM but even on a
>> machine with 4GB of RAM I get this error message.
>> Besides decreasing the number of initial particles, is there a way of avoiding
>> this issue?
>> Thanks,
>> Bertrand
Received on Thu Jan 27 2011 - 11:42:12 CET

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