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Some sort of load management is needed \#)0}\#)0}  Goals for Load Management$Graceful degradation  (refer to graph) as offered load exceeds capacity, the service maintains high throughput with a linear response-time penalty impacts all clients equally, or based on some policy Currently, this doesn t exist in the Web  (sudden crash) Reasons: Traditional operating systems designs transparent resource virtualization => little or no control of resources Models of concurrency Processes and threads have high overhead => concurrency limit (B&I>(B&I  >Threads vs Events (Threads)$?Thread-based concurrency: one thread per request Widely used, easy to program When number grows (several hundreds), performance degradation is severe, due to overhead Bounded thread pools A limit is placed on the number of threads allowed per service Avoids throughput degradation in web servers Introduces unfairness 1w?C1w?C   Threads vs Events (Events)$Event-driven concurrency Small number of threads (usually 1 per CPU) Infinite loop processes events from a queue Events are generated by application or OS Example: disk/network I/O, timers etc Task processing is a finite state machine Events trigger transitions Server maintains its own continuation state for each task Scales better than thread-based design Increased complexity on the event scheduler (critical component) Assumption: event-handling threads don t block Not always true (file I/O is blocking in most OSes) ,,*&*/4,,*&*    /4 Event-Driven Server Design$Scheduler: main thread FSM: a request or flow of execution Based on incoming events, scheduler triggers the appropriate FSM(s) Scheduler must control each FSM increased complexity performance degradation when number of FSMs increases*KK  Threads vs Events: Comparison$&Threaded server throughput degradation '& *Event-driven server throughput degradation++ 'Staged Event-Driven Architecture (SEDA)(($Goals Support massive concurrency Event-driven execution where possible Efficient and scalable I/O primitives Simplify construction of well-conditioned services Abstractions hide away details of scheduling and resource management Modular construction of applications Enable introspection Application Should support adaptive behavior reacting to load condition. Support self-tuning resource management System dynamically adjusts parameters to meet load requirementsL3jJ(@ @ *j  J  (@%SEDA: Details (finite stage machine?)&&$Stage: Fundamental unit for SEDA A stage is a self-contained component containing Event handler Processes batch of events, signals more events and places them on queue or other stages Incoming event queue May be finite Thread pool Managed by thread pool controller nRX "0 W     !  SEDA: Details$Controller  allows adaptive resources Observes runtime characteristics of a stage Adjusts resource allocation and scheduling to meet demands Can operate with local (state) or global (system) knowledge Examples Thread pool controller Adjusts the number of threads within a stage Samples the input queue and adds a thread when queue length > threshold Removes idle threads Batching controller Sets the number of events processed by event handler Observes output rate of events, decreases batching factor until throughput begins to degrade If throughput degrades, it is increased slightly Sudden drops in load reset batching factor to max value ' '    #Thread pool controller: performance$$$  Batch controller: performance$   SEDA: Details$;Applications following architecture Networks of stages linked by event queues Threads are constrained to a single stage Direct communication between threads of different stages is not possible Event queues are used for message passing and IPC Improved modularity Downside: latency Stages can manage load independently Since queue is finite, application can act accordingly in the presence of heavy load Modular/component design facilitates debugging and performance analysis One can place stages for inspection purposes without interfering with system operation 6%**{&&W%**{  &&W        Sandstorm $A SEDA-based Internet services platform Implemented in Java Provides asynchronous socket I/O High performance, exhibits graceful degradation and can handle socket connections in the orders of thousands Made possible since there are many sockets per thread Also provides asynchronous file IO Since OS doesn t provide nonblocking file I/O, this is obtained using a bounded thread pool and blocking I/O Provides familiar Unix-like interface (read, write etc) (5m7#(5m7  #  $$Asynchronous Sockets Layer$wThree stages Read: Responds to network I/O readiness events and reads data from sockets, putting new packets to the application event queue Write: Accepts outgoing packets and schedules them for writing to the appropriate socket, then establishes new outgoing connections Listen: Accepts new TCP connections and pushes connection events to the application event queue  f zX  Application: Haboob Web Server$   Haboob: Performance$ "Gnutella Client (Resource Control)##(Queue threshold allowed due to Gnutella s robust (redundancy) Dynamic thread allocation  load conditioning SEDA: Conclusions$!Massive concurrency dictates different approaches in server design Event-driven models outperform thread-based models in robustness and scalability Application must play a part in system resource management SEDA uses the event-driven model in conjunction with dynamic resource control to achieve robustness, modularity, concurrency and scalability Traditional OS design may be insufficient for meeting the demands of high-performance internet applications New OSes can provide applications with greater control over scheduling and resource usageTCZCZR/  0` ̙33` ` ff3333f` 333MMM` f` f` 3>?" dd@,|?" dd@   " @ ` n?" dd@   @@``PR    @ ` ` p>> $(    6b P  T Click to edit Master title style! !  0e   RClick to edit Master text styles Second level Third level Fourth level Fifth level!     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Bustamante70Microsoft PowerPoint@yP@ Jx@j<Gg  :  y--$xx--'@Times New Roman-.  2 q1."SystemN-@Times New Roman-. 42 $SEDA: An Architecture for Well .-@Times New Roman-.  2 $-.-@Times New Roman-. 42 0Conditioned Scalable Internet .-@Times New Roman-. 2 <@Services.-@Times New Roman-. :2 K"Matt Welsh, David Culler and Eric .-@Times New Roman-. 2 TFBrewer.-՜.+,0T    On-screen ShowNTUA Times New RomanBlank Presentation.pot Bitmap ImageGSEDA: An Architecture for Well-Conditioned Scalable Internet Services Problem: Web Serving ChallengesGoals for Load ManagementThreads vs Events (Threads)Threads vs Events (Events)Event-Driven Server DesignThreads vs Events: Comparison(Staged Event-Driven Architecture (SEDA)&SEDA: Details (finite stage machine?)SEDA: Details$Thread pool controller: performanceBatch controller: performanceSEDA: Details SandstormAsynchronous Sockets LayerApplication: Haboob Web ServerHaboob: Performance#Gnutella Client (Resource Control)SEDA: Conclusions  Fonts UsedDesign TemplateEmbedded OLE Servers Slide Titles,_0Fabian E. 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