You mean
reducing the subdiv cache? That helped but instead I got warning that the memory per thread is low (something like that) and that it might affect performance.
As far as memory usage is concerned I'm not sure but I remember it was around 1.19GB (must check.) I have a pretty strong machine that generally works like a dream so I don't really believe it's too much for her. I removed all grass objects and instead used planetary grass shader by Martin - no success.
The render does fine with following settings - AA cranked down to 3 (
), bucket size 64x64, subdiv cache at about 320 and threads to 1-16. Fortunately detail is still at 0.863 with res of 1280x768...
Though it works I still get nightmares at bedtime, knowing that the problem is still somewhere there. In case you have any other ideas, I invite you to share.