Fortran asynchronous I/O: does it use threads

[qqjzhao]

Hi,

I'm using ifort andFortran asynchronous I/O in my code. When I debug the program, some time I notice that one thread is created for each call of asynchronousread() or write(). For some time no new thread is created. My question is that whether I could use threading information to check ifasynchronous i/o is enabled.

And I'd like to know a bit about how the aio**() is get called or some debugging/tracing tools working with asynchronous I/O.

Best

[Steven_L_Intel1]

Yes, asynchronous I/O uses threads. Only sequential, unformatted I/O of whole arrays is actually done asynchronously. There is no independent way I know of to check.