simulator: Perform usage propagation only on change

This change updates the logic in SimAbstractMachine to only propagate
usages when the value has changed.

1 files changed, 7 insertions, 1 deletions

diff --git a/simulator/opendc-simulator/opendc-simulator-compute/src/main/kotlin/org/opendc/simulator/compute/SimAbstractMachine.kt b/simulator/opendc-simulator/opendc-simulator-compute/src/main/kotlin/org/opendc/simulator/compute/SimAbstractMachine.kt
index 1f26c9c9..252a40ec 100644
--- a/simulator/opendc-simulator/opendc-simulator-compute/src/main/kotlin/org/opendc/simulator/compute/SimAbstractMachine.kt
+++ b/simulator/opendc-simulator/opendc-simulator-compute/src/main/kotlin/org/opendc/simulator/compute/SimAbstractMachine.kt
@@ -101,11 +101,17 @@ public abstract class SimAbstractMachine(private val clock: Clock) : SimMachine
         for ((cpu, source) in resources) {
             val consumer = workload.getConsumer(ctx, cpu)
             val adapter = SimSpeedConsumerAdapter(consumer) { newSpeed ->
+                val _speed = _speed
+                val _usage = _usage
+
                 val oldSpeed = _speed[cpu.id]
                 _speed[cpu.id] = newSpeed
                 totalSpeed = totalSpeed - oldSpeed + newSpeed
 
-                updateUsage(totalSpeed / totalCapacity)
+                val newUsage = totalSpeed / totalCapacity
+                if (_usage.value != newUsage) {
+                    updateUsage(totalSpeed / totalCapacity)
+                }
             }
 
             launch { source.consume(adapter) }