parallel operations

[Max Weiss]

I´m writing a program in which I receive data from a GPIB and a RS485
port. I´m trying to optimize the program, to make it as fast as I can.

Therefore I have built two parallel loops in one VI, one for the RS485
and one for the GPIB. The data from both loops´re concatenated after to
save them in a file.
The operations in the RS485-loop take exactly 400 ms, the operations in
the GPIB-loop need also 400ms. If I run the VI with the two parallel
loops it takes 700ms.
Why?
Normally the VI should need only 400ms because the single loops work
with different resources and each need only 400ms because the connected
devices´re so slow - not my computer. My computer is not working to
capacity.
What can I do to have to independent tasks? Do I have to
write two VIs,
one for the GPIB and one for the RS485?



--
Ciao
Max


* Max Weiss/Kaiserstr. 188/76133 Karlsruhe/0721 2030339/Germany *
* max@mvmpc9.ciw.uni-karlsruhe.de/DB8MWE *

[TWGomez]

Make sure that they start at the same time for them to end at the same time. Either by data flow or you could use Rendevous or some other synchro method.

[johnsold]

Make sure each loop has a wait function. This allows LV's internal scheduler to switch tasks between the two loops. If one or both loops lack a wait function that loop can tie up the CPU until it completes. Even a wait of zero ms will allow the parallelism.

Lynn