QoS for (Web) Applications Velocity EU 2011

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1 QoS for (Web) Applications Velocity EU 2011 Intelligent Activity Metering Self Regulated Software Signals & Control

2 Self Adaptive Software Self Adaptive Software evaluates its own behavior and changes behavior when the evaluation indicates that it is not accomplishing what the software is intended to do, or when better functionality or performance is possible. DARPA

3 Feedback Loops Evidence Observation 1 Action 4 Feedback Loop 2 Relevance Reaction Self Regulated Judgement 3 Consequence Evidence, Relevance, Conseqence, Action

4 Self Observation Observe & Optimize Control & Collect Measure Observe, Optimize, Control, Collect

5 Self Control Disturbances Goals Control Process Tolerance AutoTune Controller Threshold AutoTune Probe Metering Sensor Run AutoTune Monitor Reading Control, Process, Sensor

6 DIRT - Data in Realtime Local Remote Past Present Predicted Remote, Past, Local, Present, Predicted

7 % => PP.PPPP Profile Protect Police Prioritize Predict Provision Profile,Protect,Police,Prioritize,Predict,Provide

8 Profile instrument, measure, and collect performance data for a significant portion of an application code base

9 Protect supervisory routines that are embedded into the runtime to govern the execution flow & consumption of resources

10 Police watching for non-compliant behavior & taking corrective measures to enforce call flow contracts and agreements

11 Prioritize differentiating the quality of service that is offered to applications, activities and actors

12 Predict controllers that use past & current in-flight data & models to predict behavior & consumption and then to optimize

13 Provide resource capacity planning based on inflight activities & predicted their predicted requirements - in internet time

14 QoS for Networks The ability of the network to provide better or special service to a set of packets/dataflows to the detriment of other packets/dataflows

15 Traffic Characteristics Bandwidth the number of bits per second that can be expected to be transmitted Delay the elapse time between when a packet is first sent and when it arrives Jitter the variation in the arrival rate, or delay introduced, of packets sent at a uniform rate Packet loss all routers lose, drop of discard packets for a number of reasons

16 Traffic Planning Identify traffic and its requirements in terms of service levels Divide and Associate traffic into classes of service levels Define policies for each class of service level which cause some change in the traffic characteristic mentioned previously

17 Traffic Service Classification differentiating one packet from another by examining fields inside of the packet s header in some cases this classification is performed automatically and adaptively based on traffic patterns and resource consumption behavior

18 Traffic Congestion Management using queues and schedulers which split traffic across queues and schedulers based on service classification associated with a packet or flow

19 Traffic Policing and Shaping Policing traffic contracts which define how much data can be sent Shaping smoothing the peaks & troughs of data transmission in order to optimize or guarantee performance & bandwidth.

20 QoS for Applications The ability of the runtime to provide better or special service to a set of calls/threads to the detriment of other calls/threads.

21 Call Characteristics Throughput the number of requests/calls per second that can expect to receive a valid response Response Time the time between a request/call is sent (received) & when it s response is received (sent) Response Time Variation the variation in the response time of requests/calls Exceptions & Errors faults can occur in runtimes such as timeouts caused by contention and corruption

22 Call Planning Identify request/call patterns and their requirements in terms of service levels Divide and Associate request/call patterns into classes of service levels. Define policies for each class of service level which cause some change in the request/call characteristic mentioned previously

23 Call Service Classification differentiation is typically done by examining the execution context associated with a request/call

24 Call Congestion Management managed using concurrency and control constructs such as semaphores/latches/locks which are generally backed by implicit or explicit queues consisting of parked threads during contention

25 Call Policing & Shaping Policing call contracts which define how many calls can be sent Shaping it tries to conform the call rate to the call contract using some form of delay mechanism such as waiting and parking

26 Network-to-Application Mapping Network Packet Flow Router Datalink Buffer Queue Application Call Thread Method Call Site Resource Semaphore

27 The Application is the Network code execution point (method, call site, activity) bottleneck point (consumption, coordination, contention) code execution flow path QoS service (re-)classification point QoS reservation extension or (re-)prioritization point QoS queuing, prioritization, rate limiting

28 Activity Based (Resource) Metering metering has the potential to revolutionize the software design, development, testing, and management a metering standard would define a model, concepts and mechanism which can be used across languages and processing boundaries to control and cost consumption

29 Methods of Measurement Method Metering Metric Analysis Causality Correlation Accuracy Event Sampled Allocation Thread Process Assignment Direct Apportioned

30 Metering Measurement Model Model Activity Resource Device Probe Meter Develop Code Counter Design Behavior Usage Data Group Metering

31 QoS Enablement public int func(...) { } reserve(func) release(units) QoS Resource Rate Limiting Priority Queueing Reservation Lanes

32 Demo: Prioritization Ln: Pool L4: L3: L2: L1:

33 Demo: Resource Reservation Give Take Permit Pool

34 Demo: Rate Limiting Leaky Bucket

35 QoS Reservation Lanes lane #1 within range not in range priority level capacity limit lane #2 not in range lane #N within range within range resource pool

36 Fairer Web Page Servicing with Performance Credits User WebPage Resource

37 Fairer Web Page Servicing with Performance Credits

38 A Cloud Cortex Context PaaS Application Open API APM Chargeback Extensions Open API CARS Metering BI Open API Plugins QoS Control Open API PaaS Runtime Consumption APM: Application Performance Management CARS: Cost Aware Runtimes & Services BI: Business Intelligence QoS: Quality of Service

39 Cloud Services Client cl sf://... cl:clock.time= sf:clock.time= sf:cpu.time= sf:io.bytes= sf:charge.unit= sf:db.time= sf:db.count= s3:clock.time= s3:io.bytes= s3:charge.unit= Response sf:clock.time= sf:cpu.time= sf:io.bytes= sf:charge.unit= sf:db.time= sf:db.count= s3:clock.time= s3:io.bytes= s3:charge.unit= sf s3 aws.amazon.com salesforce.com db Response s3:clock.time= s3:io.bytes= s3:charge.unit= Metering Management Service

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