14.2.1                    Configuration

In the case of using two or more GPU devices concurrently, the queue system is used. Every time QW-Simulator GPU launches it looks for the first device from the queue that is not yet occupied by another instance of QW-Simulator GPU. If each device from the queue is occupied then the search loops back. This process is continued.

In GPU tab in Preferences dialogue there is a list of all devices available on the current machine. The order in the queue is given in the first Preference column. Devices on the list are always sorted by this column. Symbol "--" means that this device is not in the queue and will not be used while other preferences are available. Adding/removing device from the queue can be performed by using Add/Remove button. Buttons with up and down arrows allow user shifting the order in the queue.

The option of using higher precision floating point (double) operations for S-Parameters/FD-Probing is available. Projects considering very low frequencies in those postprocessing and/or with very small time step (determined by a size of the smallest FDTD cell) could suffer with substantial numerical error when using single precision floating point. Since many graphics cards, especially older types, provide poor double precision support (resulting in slowdowns) we leave it to the user to decide if the option is required. For Nvidia Tesla, high-end GeForce or similar cards we suggest enabling this option permanently.