WAS v8.5 > WebSphere applications > Service integration > MediationsConcurrent mediations
Several messages might be mediated concurrently, to achieve maximum throughput for a selected mediated destination.
Maximum number of messages that can be mediated concurrently at a selected destination is capped for each messaging engine by the maximum size of the mediation thread pool.
We can specify that a mediation operates concurrently by setting the Allow Concurrent mediation property to True, using the dmgr console. If message ordering is important, do not allow concurrent mediations. By default (Allow Concurrent mediation is set to False), a single message is mediated at a time.
Related
Configure the mediation thread pool
Modify the properties of a mediation
Reference:
Mediation thread pool properties