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Thanks for the detailed responses.
I will try to implement some of the ideas.

I.

Actually I use the file for exchanging data between 2 processes - 1 is only writing and the other is only reading. This is done each 30 ms.

Besides that, I need the data in the file anyway for...

After my previous thread, I think I found out what causes the long delays.

I run this program on several Linux computers, and the sometimes (after the file with the arrays becomes big) the fwrite...

I set a timer using setitimer to expire every 30 ms.
Usually it does. But sometimes it takes ~ 700 ms between 2 successive arousals (expirations). The timing is crucial for me.

The process with...