Increase io priority on Windows?

Question

Originally my producer function would just write the data, now I have a second thread that is responsible for writing the data. The producer function does a memcpy into a circular buffer and triggers the consumer thread to start writing.

When I use the 2 threaded scheme I get the desired thread isolation, program stability and the ability to variable computation before writing - but the io performance is 50% worse.

My theory is that there is some kind of priority that can be set per thread that I want to adjust. Is this possible.

I am using 2 SSDs in a RAID0 data stripping configuration.

Answer 1

What do you mean by "io performance is 50% worse"? According to your resource monitor it is as high as it can be: disk queue is full, disk active time is 100%. If you mean write speed jumps - they have nothing to do with any possible thread priority. They are cause by disk head positioning due to files fragmentation, fs table modifications and so on.