CurveBS I/O processing flow Before introducing IO processing flow, we first describe the overall architecture, data organization and topology structure of CURVE. CurveBS uses the central the NEBDServer, which affects services in few seconds. CurveBS IO processing flow Overall process The flow of user's read and write request to curve: 1. The user initiates a request (fd=1 6. At last, the Client notifies the user that the request is completed.Chunkserver processing flow CopysetNode is essentially a wrapper around the RAFT algorithm. The Copyset module encapsulates

vec[index] = 0; // valid vec.clear(); vec[index] = 2; // invalid }Goals – Control Flow Validate based of control flow for: if/else, for loops, etc... void foo() { my_vector vec = { /* ... */ });Control Flow Record and validate control flow enum class control_flow { if_, else_if, for_, return_, /*...*/ }; if (cond) { M::addflow::if_>; } M::addflow::end_scope>;Macro }));Control Flow - Parsing Parse string of code into a control flow enum value constexpr control_flow parse_control(std::string_view str) { if (str == "{") return control_flow::start_scope;

is destroyed Stack-based (automatic) data objects • Is symmetry to define state based on control-flow (static lexical scoping) • Edge cases managed by the C++ Standard (Guaranteed!) “The compiler giveth is destroyed Stack-based (automatic) data objects • Is symmetry to define state based on control-flow (static lexical scoping) • Edge cases managed by the C++ Standard (Guaranteed!) “The compiler giveth taketh away” Heap-based (dynamic) data objects • Is symmetry to define state independent of control-flow (static lexical scoping) • Edge cases managed by the developer “The developer giveth, and the developer

● Lifetime safety ● Data Flow Analysis● DFA analyzes the data: ● Function parameters/ arguments ● Function return value ● Fields and global variables Data Flow Analysis – Condition is always }Data Flow Analysis – void linked_list::process() { for (node *pt = head; pt != nullptr; pt = pt->next) { delete pt; } } Local variable may point to deallocated memoryData Flow Analysis recursion ● Unused values ● Null dereference ● Escape analysis ● Dangling pointers Data Flow Analysis – class Deref { int* foo() { return nullptr; } public: void bar()

Exceptions were designed for ? • Program has encountered a serious error, and getting out of this control flow to prevent data corruption or other damage is more important than trying to continue onward. • handling if the event doesn't occur often, that is, if the event is truly exceptional How much of your flow (upper-bound) should be taking exception paths ? • Does anyone measure this ? How do I handle “frequent” functionality (as opposed to logging and reset) 66 Bloomberg Exceptional Control Flow68 Bloomberg Exceptional Control Flow bool process(const Info& data) { try { Msg request = apply(data); return send(request);

Pomodoro is a technique for increasing productivity and focus by getting yourself into a state a Flow. Basic requirements ① A kitchen timer ② A short to-do list [2] ③ A little discipline [2] • Turn timetable according to your to-dos, to your time, or even to the seasonWhy does this work? (Theory) Flow: The Psychology of Optimal Experience by Mihaly Csikszentmihalyi [3] From Amazon.com Psychologist revealed that what makes an experience genuinely satisfying is a state of consciousness called flow. During flow, people typically experience deep enjoyment, creativity, and a total involvement with life

write • The diagram illustrates that, just like a road without bottlenecks allows for smooth traffic flow, we need to ensures that all operations run efficiently. Fanchen Su, XOffsetDatastructure, CppCon Encoding and Zero Decoding • As illustrated in the diagram, our solution enables free and efficient flow of data through all stages: reading, writing, sending and receiving data. • The ability to freely XOffsetDatastructure, CppCon 2024 61 Send & Recv Send & Recv Read & Write Read & Write Read & Write Data Flow4. Performance Statistics The performance statistics of XOffsetDatastructure are presented in this

Cash Flow Over Ten Years to $389B… 113 *Note: Big Six USA technology companies include Apple, Nvidia, Microsoft, Alphabet / Google, Amazon, & Meta Platforms / Facebook. FCF calculated as cash flow from Amazon Meta 2014 2019 2024 Free Cash Flow, $B Tech Big Six (USA) = Loaded With Cash to Spend on AI & CapEx Big Six* Public Technology Companies – Free Cash Flow ($B) – 2014-2024, per Capital IQ…Big Six* with market capitalizations in excess of $1 trillion – most with gross margins of +50% plus free cash flow – attacking the same opportunity at the same time in a relatively transparent world, adding in high

policies for low priority tasks. TiKV ensures that higher priority tasks are executed first by adding flow control to low priority tasks. PD cert- �→ allowed �→ -cn Modified Starting from v8.4.0, configur- when handling a large number of DELETE versions #17269 @AndreMouche • Support dynamically modifying flow-control configurations for write operations #17395 @glorv • Improve the speed of Region Merge in Y Y Y Y Y Y Y Y JSON type Y Y Y Y Y Y Y E E E E E Vectort types E N N N N N N N N N N N Control flow functions Y Y Y Y Y Y Y Y Y Y Y Y String functions Y Y Y Y Y Y Y Y Y Y Y Y Numeric functions and

policies for low priority tasks. TiKV ensures that higher priority tasks are executed first by adding flow control to low priority tasks. PD cert- �→ allowed �→ -cn Modified Starting from v8.4.0, configur- when handling a large number of DELETE versions #17269 @AndreMouche • Support dynamically modifying flow-control configurations for write operations #17395 @glorv • Improve the speed of Region Merge in Y Y Y Y Y Y Y Y JSON type Y Y Y Y Y Y Y E E E E E Vectort types E N N N N N N N N N N N Control flow functions Y Y Y Y Y Y Y Y Y Y Y Y String functions Y Y Y Y Y Y Y Y Y Y Y Y Numeric functions and