From ed5438692d74b04a2fc59bdb8e2b223129df8f67 Mon Sep 17 00:00:00 2001 From: Georgios Andreadis Date: Tue, 17 Mar 2020 11:56:11 +0100 Subject: Apply performance interference only to (on average) one VM This matches more accurately how real deployments operate. --- .../opendc/core/workload/PerformanceInterferenceModel.kt | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) 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 78d5cd82..e2032ff1 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 @@ -1,6 +1,7 @@ package com.atlarge.opendc.core.workload import com.atlarge.opendc.core.resource.Resource +import kotlin.random.Random /** * Meta-data key for the [PerformanceInterferenceModel] of an image. @@ -24,10 +25,17 @@ data class PerformanceInterferenceModel( if (intersectingItems.isEmpty()) { return 1.0 } - return intersectingItems + val score = intersectingItems .filter { it.minServerLoad <= currentServerLoad } .map { it.performanceScore } - .min() ?: 1.0 + .min() + + // Apply performance penalty to (on average) only one of the VMs + return if (score != null && Random.nextInt(items.size) == 0) { + score + } else { + 1.0 + } } } -- cgit v1.2.3