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remotecall_fetch

remotecall_fetch(func, id, args...)

Perform fetch(remotecall(...)) in one message. Any remote exceptions are captured in a RemoteException and thrown.

Examples

1. Perform a remote function call and fetch the result:

   julia> result = remotecall_fetch(sqrt, 2, 4.0)
   2.0

   This example performs a remote function call to calculate the square root of 4 on the worker with id 2. The result is fetched and stored in the variable result.

2. Handle remote exceptions:

   julia> try
             remotecall_fetch(div, 2, 5, 0)
         catch ex
             ex
         end
   RemoteException(Any[DivideError()])

   In this example, a remote function call is made to divide 5 by 0 on worker 2. Since dividing by zero raises a DivideError, the exception is captured in a RemoteException and thrown.

3. Pass multiple arguments to the remote function:

   julia> remotecall_fetch(+, 2, 3, 4, 5)
   12

   Here, the + function is called on worker 2 with the arguments 3, 4, and 5. The result, which is the sum of the arguments, is fetched.

Common mistake example:

julia> result = remotecall_fetch(sqrt, 2, -4.0)
ERROR: DomainError with -4.0:
NaN result for non-NaN input.

In this case, the sqrt function is called on worker 2 with a negative value (-4.0). This results in a DomainError because the square root of a negative number is not defined. It's important to ensure that the arguments passed to the remote function are valid to avoid such errors.

See Also

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