From 896c6e2fa2cb84be2f383b39bf81c40101647694 Mon Sep 17 00:00:00 2001
From: Georgios Andreadis <info@gandreadis.com>
Date: Wed, 1 Apr 2020 18:32:04 +0200
Subject: Optimizes the performance interference model logic

Credits to Fabian for the idea!
---
 .../atlarge/opendc/core/workload/PerformanceInterferenceModel.kt  | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'opendc/opendc-core')

diff --git a/opendc/opendc-core/src/main/kotlin/com/atlarge/opendc/core/workload/PerformanceInterferenceModel.kt b/opendc/opendc-core/src/main/kotlin/com/atlarge/opendc/core/workload/PerformanceInterferenceModel.kt
index e2032ff1..ea110934 100644
--- a/opendc/opendc-core/src/main/kotlin/com/atlarge/opendc/core/workload/PerformanceInterferenceModel.kt
+++ b/opendc/opendc-core/src/main/kotlin/com/atlarge/opendc/core/workload/PerformanceInterferenceModel.kt
@@ -16,12 +16,16 @@ const val IMAGE_PERF_INTERFERENCE_MODEL = "image:performance-interference"
 data class PerformanceInterferenceModel(
     val items: Set<PerformanceInterferenceModelItem>
 ) {
-    fun apply(colocatedWorkloads: Set<Resource>, currentServerLoad: Double): Double {
+    private var intersectingItems: List<PerformanceInterferenceModelItem> = emptyList()
+
+    fun computeIntersectingItems(colocatedWorkloads: Set<Resource>) {
         val colocatedWorkloadIds = colocatedWorkloads.map { it.name }
-        val intersectingItems = items.filter { item ->
+        intersectingItems = items.filter { item ->
             colocatedWorkloadIds.intersect(item.workloadNames).size > 1
         }
+    }
 
+    fun apply(currentServerLoad: Double): Double {
         if (intersectingItems.isEmpty()) {
             return 1.0
         }
-- 
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