Multiple process usage

[tugrul512bit]

Is this thread-safe in itself? What happens if OS writes/reads myfile.txt while I have a process also reading/writing myfile.txt?

What if different files are accessed concurrently?

Do we get graphics card's asynchronous features (like pci-e both ways usage, read+write concurrently)?

I have 2x K420 cards and a GT1030 card. Can I use 3 instances and somehow join all for 6GB(2 each) memory without losing threadsafeness? Can I have 2-3 instances on 1 graphics card to have more threading?

[twobombs]

AFAIK 5x yes