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O =f@1Capriccio: Scalable Threads for Internet Services 2 wR. Von Behren, J. Condit, F. Zhou, C. Necula, E. Brewer U.California, Berkeley SOSP 2003 Presented by: Stefan Birrer*xPYZ        4 AMain Contribution   Scalable user-level thread package Alternative to Event-based models Kernel-thread models Scalability to 100,000 threads Efficient for Internet ServersN#(>#(>   B Key Features  Scalability with user-level threads Cooperative scheduling Asynchronous disk I/O Efficient thread operations - O(1) Linked stack management Resource-aware scheduling :$Q3$Q3  COutline  Related Work and  Debate Capriccio Scalability Linked Stack Management Resource-Aware Scheduling b D Related Work  Events vs. Threads (Ouserhout, Laura and Needham, Adya, SEDA) User-level thread packages (Filaments, NT Fibers, State Threads, Scheduler Activations) Kernel Threads (NTPL, Pthreads) Stack Management (Lazy Threads)   E2Debate  event-based side  ,Event-based arguments by Ousterhout (Why threads are bad?, 1996) Events are more efficient (context switching, locking overheads with threads) Threads - hard to program (deadlocks, synchronization) Poor thread support (portability, debugging) Many event-based implementation (Harvest, Flash, SEDA) :A8A8 - F0Debate  other arguments  fNeutral argument by Lauer and Needham (On the duality of OS system structures, 1978) Pro-thread arguments by Behren, Condit, Brewer (Why events are bad?, 2003) Greater code readability No  stack-ripping Slow thread performance - implementation artifact High performance servers more sensitive to scheduling& 4 GWhy user-level threads?   Decoupling from the OS/kernel OS independence Kernel variation Address application-specific needs Cooperative threading  more efficient synchronization Less  kernel crossing Better memory management:FgFg  HImplementation  Non-blocking wrappers for blocking I/O Asynchronous disk I/O where possible Cheap synchronization Efficient O(1) thread operations   I Benchmarks ]   (left) Capriccio scales to 100,000 threads (right) Network I/O throughput with Capriccio only has 10% overhead over epoll With asynchronous I/O disk performance is comparable in Capriccio vs. other thread packages .+0]   J#Disadvantages of user-level threads $ yNon-blocking wrappers of blocking I/O increase kernel crossings Difficult to integrate with multiple processor scheduling z KDynamic Linked Stacks   Problem: Conservative stack allocations per thread are unsuitable for programs with many threads. Solution: Dynamic stack allocation with linked chunks alleviates VM pressure and improves paging behavior. Method: Compile-time analysis and checkpoint injection into the code.   LWeighted Call Graph ]   MChallenging cases   qFunction pointers are only determined at run-time. External function calls require conservative stack allocation. r NApache 2.0.44 Benchmark   Given 2 KB  max-path only 10.6% call sites required check-pointing code. Overhead in the number of instructions was 3-4%. { OResource-Aware Scheduling  Key idea: View an application as a sequence of stages separated by blocking points. Method: Track resources (CPU, memory, file descriptors) used at each stage and schedule threads according to resources.   PBlocking Graph ]   Q Pitfalls   CMaximum capacity of a particular resource is difficult to determine (e.g: internal memory pools) Thrashing is not easily detectable. Non-yielding threads lead to unfairness and starvation in cooperative scheduling. Blocking graphs are expensive to maintain (for Apache 2.0.44 stack trace overhead is 8% of execution time). D  RWeb Server Performance ]   S Conclusion  Capriccio demonstrates a user-level thread package that achieves High scalability Efficient stack management Scheduling based on resource usage Drawbacks Performance not comparable to event-based systems High overhead in stack tracing Lack of sufficient multi-processor supportNAP |AP |    T Future Work  Extending Capriccio to work with multiple processors Reducing the kernel crossings with batching asynchronous network I/O Disambiguate function pointers in stack allocation Improving resource-aware scheduling Tracking variance in resource usage Better detection of thrashing :BB  /L        (   0` .T3f` T3f3f` 999MMM` lff3f3޲` eoHff33Ҷ` ff!` T3f3f___>?" dd@$?nPd@ d " @ ` n?" dd@   @@``PR   @ ` `(p>>  H@ (    s *] "0@ z T Click to edit Master title style! !  c $] "0j ] RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  Nff??"?  Nff??"? F  "  Nff??"  Nff??"   Nff??"  Nff??"?  c $0 ] "` ] b*(2Z  B޽h))? ? 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Bustamante AquaLab05Fabian E. Bustamante65Microsoft PowerPoint@H)@}@ OQ@3J\WGSg  )'    """)))UUUMMMBBB999|PP3f333f3333f3ffffff3f̙3ff333f333333333f33333333f33f3ff3f3f3f3333f33̙33333f333333f3333f3ffffff3f33ff3f3f3f3fff3ffffffffff3ffff̙fff3fffff3fff333f3f3ff3ff33f̙̙3̙ff̙̙̙3f̙3f333f3333f3ffffff3f̙3f3f3f333f3333f3ffffff3f̙3f3ffffffffff!___www@4'A x(xKʦ """)))UUUMMMBBB999|PP3f3333f333ff3fffff3f3f̙f3333f3333333333f3333333f3f33ff3f3f3f3333f3333333f3̙33333f333ff3ffffff3f33f3ff3f3f3ffff3fffffffff3fffffff3f̙ffff3ff333f3ff33fff33f3ff̙3f3f3333f333ff3fffff̙̙3̙f̙̙̙3f̙3f3f3333f333ff3fffff3f3f̙3ffffffffff!___wwweeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮϮ՜.+,0    On-screen ShowEast Texas Data ServiceTl Times New RomanTahomaArial WingdingsVerdana Helvetica aqualab012Capriccio: Scalable Threads for Internet ServicesMain Contribution Key FeaturesOutline Related WorkDebate event-based sideDebate other argumentsWhy user-level threads? Implementation Benchmarks$Disadvantages of user-level threadsDynamic Linked Stacks Weighted Call Graph Challenging cases Apache 2.0.44 Benchmark Resource-Aware SchedulingBlocking Graph Pitfalls Web Server Performance Conclusion Future Work  Fonts UsedDesign Template Slide Titles,_Ԭ0Fabian E. BustamanteFabian E. Bustamante  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~      !"#$%&'()*,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUWXYZ[\]_`abcdejRoot EntrydO)PicturesCurrent User^SummaryInformation(+DUPowerPoint Document(DocumentSummaryInformation8V