Q: Today I'm loading a file of 10GB OASIS on my workstation. It's the biggest file in our database. The workstation has 16GB of memory. Why was the loading extremely slow?
A: There are many factors that may impact the loading speed of layout file in DESIGNrev. In this case, the memory becomes the limitation factor. OASIS files usually have much smaller size than GDSII files. That means it has more compression internally in the file. So when opening OASIS files, it usually takes more memory than the GDSII file because some contents need to be uncompressed in the memory to be displayed properly. When the workstation running out of physical memory, it uses harddrive to swap. And harddrives are usually much slower than RAM.
A rule of thumb is that your memory should be at least 3X of the OASIS file size to load it all into memory. However, the compression rates may vary for different files.