Knowing the amount of memory needed to analyze a circuit and the subsectioning will help you to estimate the processing time for your simulation. Your ability to predict this will improve with experience. Clicking on the Estimate Memory button in the Analysis Box dialog box opens the Estimate Memory dialog box and translates and subsections your project. A simple status popup appears to indicate that the circuit is being subsectioned. When the subsectioning is complete, the memory use estimate and the subsectioning information, listed by level and total amounts, appears in the dialog box. You may click on the View Subsections button to open a viewer which displays the subsectioning of your circuit. You may view all metalization levels and their subsectioning.
You may also use the command Sonnet ⇒ Analysis ⇒ Estimate Memory from the main menu of the layout window to obtain an estimate of the memory required to analyze your circuit.