Analytica Specifications

Analytica User GuideAppendicesAnalytica Specifications

Hardware and Software

CPUs supported	Pentium or higher and equivalent AMD processors recommended
System Software	Windows XP, Vista, Windows 7, Server
Memory requirements	128 MB (512 MB+ recommended)
Application size	Approximately 6 MB
Maximum memory usable by Analytica process	Analytica 64-bit: 128GB (limited by max pagefile size) Analytica 32-bit: 4GB on Windows x64 3GB if /3GB flag added in C:\boot.ini 2GB without /3GB flag in C:\boot.ini

Objects

Number of system objects	738
Maximum user-defined objects	31,900
Maximum number of local variables	No fixed limit

Uncertainty

Probability methods	Random Latin HyperCube Median Latin HyperCube Monte Carlo
Maximum sample size	99,999,999 for Analytica Enterprise, Optimizer, Power Player, and ADE 30,000 (other editions) limited by available memory
Random sampling methods	Minimal Standard L’Ecuyer Knuth

Numbers and arrays

Number precision	15 significant digits for floating-point numbers 9 digits for integers
Maximum elements in a dimension	99,999,999 (Analytica Enterprise, Optimizer, Power Player, and ADE) 30,000 (other editions)
Maximum dimensions in an array	15

Memory usage

The Memory Usage window displays the amount of memory available on your system, as well as the memory currently in use by all applications, including Windows itself. The memory available on your system is the sum of all physical memory installed on your system and the pagefile on your hard disk, which is used to complement the physical memory.

To display the Memory Usage window, select Show Memory Usage from the Window menu. The memory usage displays in two sizes, depending on whether you check Expanded View. The expanded view contains a large number of memory statistics.

Tip

The above window appears automatically when Analytica runs low on memory.

If you require additional memory to run your model at a given sample size, you can take several steps to increase the amount of memory available to Analytica:

1. Close other open applications.

All applications require a segment of memory to operate, and this reduces the memory available to Analytica.

2. Increase the size of your computer’s page file.

3. Analytica is a 32-bit process, and like all 32-bit process, the Windows operating system limits the maximum amount of memory that can be used by a 32-bit process to a default limit of 2GB. In Windows XP and Vista, this limit can be increased to 3GB by editing the system file C:\boot.ini. For the line corresponding to your operating in that file, append /3GB and /USERVA options. For example, after your edit, the line may be:

multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Windows XP" /3GB /USERVA

After making the edit, a system reboot is required for this to take effect.

4. Consider adding more physical memory to your computer.

If you are limited by the 3GB per process ceiling, then adding more memory will not increase available space, although it may speed up execution when other applications are also open. Analytica 64-bit will directly benefit from any RAM you add.

5. Add a solid-state drive to your computer and locate your page file on it.

6. Consider ways to reorganize your model. Are there dimensions that can be removed from the model, or especially from problematic high-dimensional results. The Performance Profiler (in Analytica Enterprise) can help you pinpoint variables that consume a lot of memory.

For additional ideas for coping with memory limitations, see Managing Memory and CPU Time for large models.

Selecting the Sample SizeAnalytica SpecificationsIdentifiers Already Used