http://www.sun.com/technical-computing/ISV/PTCFaq.html#MORETHAN2G
Current Sun workstations (e.g., Ultra-80) can hold up to 4 GB of RAM, thus making large memory requirements practical. Future workstation models will be capable of holding even more RAM.
One example is the PTC Division MockUp application, which is supported in the 64-bit mode on Sun. It can handle huge assemblies by taking full advantage of the large amounts of RAM and virtual address space in the system.
Uniprocessor and Multiprocessor Systems
Currently, the most popular multiprocessing model is Symmetric Multi-Processing (SMP). All Sun workstations and servers use it. Briefly, SMP means that CPUs installed in the computer have equal status; all of them can equally execute both application and kernel code. Every CPU has its own hardware cache. Any CPU can access any data that the applications use. Such access can be performed in parallel. When the application modifies data, the MP hardware ensures that all CPUs see the same data values. This feature is called "cache coherency".
To take advantage of the multiple CPUs in the same machine, you can run multiple applications at the same time. In this case, the kernel will automatically distribute the load among CPUs. Alternatively, a single application can create multiple threads running in parallel, thus taking advantage of multiple CPUs.
Pro/ENGINEER is partially multithreaded, which means that certain operations can be performed in parallel when multiple CPUs are available. A brief description of the MP/MT features of Pro/ENGINEER is available at:
http://www.sun.com/technical-computing/ISV/PTCFaq.html#MP
On Sun systems, Pro/ENGINEER is statically linked with a special malloc() package allowing faster memory allocation when multiple threads manage their memory simultaneously. Sun Microsystems owns a patent for this technology ("Memory Allocation in a Multithreaded Environment", by Greg Nakhimovsky, http://www.uspto.gov).
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