diff options
Diffstat (limited to 'controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/cost/Cost.java')
| -rw-r--r-- | controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/cost/Cost.java | 41 |
1 files changed, 23 insertions, 18 deletions
diff --git a/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/cost/Cost.java b/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/cost/Cost.java index 6de1c5371bd..5acd51e0d2e 100644 --- a/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/cost/Cost.java +++ b/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/cost/Cost.java @@ -11,25 +11,20 @@ import java.util.List; import java.util.Map; /** - * Calculate cost, hardware utilization and waste for applications. + * Calculate cost, hardware utilization and waste for Vespa. * <p> * Cost refers to the total cost ownership aka TCO. * <p> * We define a target utilization for each cluster in an application and compares this - * to the actual utilization to get a number for ideal cost (if ideally scaled) and waste. - * <p> - * The target utilization is defined with the following in mind: - * 1 Application stats to see contention on CPU above 80% - * 2 It is scaled for a 50/50 load balancing between two zones (thus must be able to serve the other zone) - * 3 Peaks are 2x average wrt CPU - * 4 Memory contention is rising when over 80% + * to the actual utilization. Cost is then the TCO for the hardware used multiplied with + * the relative utilization. Waste is the difference between target and ideal cost. * * @author smorgrav */ public interface Cost { /** - * Get application costs for all applications across all zones + * Get application costs for all applications across all zones. * * @return A list of all application costs in all zones */ @@ -51,11 +46,11 @@ public interface Cost { } /** - * Get application costs for a specific application deployement + * Get application costs for a specific application. * * @param zone The zone - the combination of a environment and region e.g 'test.us-east-1' * @param app ApplicationId e.g tenant:application:instance - * @return A list of applications cost in given zone + * @return The cost of one application */ default CostApplication getApplicationCost(Zone zone, ApplicationId app) throws NotFoundCheckedException { @@ -73,14 +68,26 @@ public interface Cost { } /** - * Provides target utilization - default targets ARE XXX + * Provides target utilization - default targets are cased on the following assumptions: + * + * 1. CPU contention starts to be noticeable at 80% and spikes are 2x average + * 2. Query load is perfectly load-balanced between two zones, cpu needs to handle fail-over - thus 2x load + * 3. Memory contention (and especially sys cpu usage from memory management) increases after 90% + * 4. Memory consumptions spikes over average with ~20% + * 5. Memory and disk usage is independent of query load + * + * The default targets are: + * CPU: 0.2 + * MEM: 0.7 + * DISK: 0.7 + * DISKBUSY: 0.3 * * @param zone The zone - the combination of a environment and region e.g 'test.us-east-1' * @param app ApplicationId e.g tenant:application:instance * @return Target utilization */ default CostResources getTargetUtilization(Zone zone, ApplicationId app) { - return new CostResources(0.8, 0.3, 0.4, 0.3); + return new CostResources(0.7, 0.2, 0.7, 0.3); } /** @@ -90,18 +97,16 @@ public interface Cost { /** * Provides information about the clusters in the application like - * what hardware that it is using, the TCO for the hardware and number of hosts. + * what hardware that it is using, the TCO for the hardware and the hostnames in the cluster. * * @param zone The zone - the combination of a environment and region e.g 'test.us-east-1' * @param app ApplicationId e.g tenant:application:instance - * @return Map between clusterid -> costclusterinfo + * @return Map between clusterid -> info */ Map<String, CostClusterInfo> getClusterInfo(Zone zone, ApplicationId app); /** - * Provides ratio of available hardware used. - * <p> - * Used to calculate the utilization of the hardware. + * Provides the ratio of available hardware used (e.g cpu, mem, disk) each in the range: [0,1]. * * @param zone The zone - the combination of a environment and region e.g 'test.us-east-1' * @param app ApplicationId e.g tenant:application:instance |