XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX''"> 5.3 Memory and General Requirements
Patran memory requirements vary according to model size and actions performed. The following guidelines are based on typical use. Solvers or other software that run concurrently with Patran may increase RAM, swap (also referred to as virtual memory), and disk space requirements.
RAM and Swap Guidelines
Patran typically generates memory, “memalloc”, or “PDB” errors when it is unable to obtain sufficient memory. Memory in this context is the sum of physical RAM and paging (swap) space.
Since RAM memory is much faster than disk-based swap memory, increasing the amount of RAM typically improves performance. A good general rule is to provide 25% to 30% of total memory as RAM. Consult your operating system documentation for additional information.
See
UNIX Shell Resource Limits, 73 for additional information on accessing memory.
Memory and Disk Space Requirements
The following tables show disk space, swap, and RAM guidelines for small, medium, and large analysis models. Patran may actually run with fewer resources than shown, but these minimums are recommended. The installation indicates required disk space when installing.
Table 5‑2 Memory Type | Minimum | Standard | Large Models |
Free Random Access Memory (RAM) per user | 128 -256 MB | 256 - 512 MB | 512 MB - 4 GB |
Paging Disk Space (Swap) | 384 MB | 512 MB | 768 MB - 2 GB |
Scratch Disk Space (/tmp) | 50 MB | Solver Dependent | Solver Dependent |
Scratch Disk Space (/var/tmp) | 10 MB | 10 MB | 10 MB |
Table 5‑3 | Minimum | Standard | Large Models |
Random Access Memory (RAM) | 128 - 256 MB | 256 -512 MB | 512 MB - 4 GB |
Paging Disk Space (Swap) | 300 - 512 MB | 500 MB - 1 GB | 1.5 GB |