Quartus® Prime Pro Edition User Guide: Design Compilation

ID 683236
Date 4/01/2024
Document Table of Contents

1.15.4. Enable Intermediate Fitter Snapshots

To save compilation time, the Compiler does not save the planned, placed, routed, or retimed snapshots by default during full compilation.

However, you can turn on Enable Intermediate Fitter Snapshots (Assignments > Settings > Compiler Settings) to generate and preserve snapshots for the Plan, Place, Route, and Retime stages any time you run full compilation. You can also run any intermediate Fitter stage independently to generate the snapshot for that stage.

With the Enable Intermediate Fitter Snapshots option enabled, multiple snapshots are saved during the Fitter stages, allowing more flexible iteration of intermediate Fitter steps. For example, you can resume and rerun from the Place snapshot as opposed to starting from the Fitter Plan stage, saving compilation time. However, with this option enabled, you might incur extra runtime to write the intermediate snapshots during Fitter stage and disk space consumption is more in order to accommodate the additional snapshots.

Note: The Enable Intermediate Fitter Snapshots option is off by default. However, if Run Fast Forward Timing Closure Recommendations during compilation option is on, then the Enable Intermediate Fitter Snapshots option is forced enabled.