OptiX was unable to open the disk cache with sufficient privileges

Question

My program using OptiX crashes with the following error:

OptiX API error 1550: OptiX was unable to open the disk cache with sufficient privileges

Where is this disk cache located, so that I can fix permissions there?

Answer 1

TL;DR:

sudo chmod -R u+rw /var/tmp/OptixCache

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The OptiX cache files had been created by another user first, which resulted in this permission error.

When faced with similar situations, using strace can help locate which files are being opened by a binary:

strace -f -e trace=openat <your_binary> <arguments>