float process(float x) { auto const y = std::vector (16); ... } > clang++ -fsanitize=realtime main.cpp > ./a.out ==86660==ERROR: RealtimeSanitizer: unsafe-library-call Intercepted call to real-time Attribute real-time functions with [[clang::nonblocking]] 2. Compile and link with -fsanitize=realtime 🤝How RealtimeSanitizer works RealtimeSanitizerTracking and interception Real-time context noundef i32 @_Z8dispatchv() #1 { call void @__rtsan_realtime_enter() %1 = call noundef i32 @_Z16calculate_resultv() call void @__rtsan_realtime_exit() ret i32 %1 } define noundef i32 @_Z8dispatchv()

down ev- ery few milliseconds. We also used libfaketime to simulate some node clocks, both CLOCK_REALTIME and CLOCK_MONOTONIC, running up to 5x faster than oth- ers. PingCAP had written their own Jepsen appends of unique elements to lists. We include realtime dependencies (e.g. T1 com- pletes before T2 begins) in our analysis. TiDB doesn’t formally promise realtime guarantees, but our results hold both with transactional anomalies dur- ing clock skew, including running CLOCK_MONOTONIC faster or slower than realtime on various nodes, is disconcerting: we believe this should lead to anoma- lies. One possible cause

workloads Isolation between OLTP and OLAP workloads (HATtrick Bench) Realtime synchronization and strong consistency Raft Learner Read Realtime update of columnar store The big issue is the balance between • Too many IOPS • Transaction support needs to store multiple versions • Sort Merge is slow Realtime update of columnar store The solution of DeltaTree, the storage engine of TiFlash • Introduces

Getting started with socket.io Remarks Socket.IO is a javascript library for realtime web applications. It enables realtime, bi-directional communication between web clients and servers. It has two parts:

non-automated) If non-realtime implementation of dynamic memory management functions is used in the project, then memory shall only be allocated and deallocated during non-realtime program phases © 2020

tables. • Realtime rollups: The materialization expression can include aggregation expressions in which case, Vitess will create a rolled up version of the source table which can be used for realtime analytics this process. -enable_realtime_stats boolean Required for the Realtime Stats view. If set, vtctld will maintain a streaming RPC to each tablet (in all cells) to gather the realtime health stats. -enable_transaction_limit The target tables can be copies, aggregations or views. The target tables are kept in sync in near-realtime. You can specify multiple tables to materialize using the json_spec parameter. Parameters JSON

19.7.2.4. 检查实时 检查实时内核版本 内核版本 在 OpenShift Container Platform 集群中，始终使用最新版本的 realtime 内核。如果您不确定集群中正在 使用的内核版本，您可以将当前的 realtime 内核版本与发行版本进行比较。 先决条件 先决条件 已安装 OpenShift CLI(oc)。 以具有 cluster-admin 权限的用户身份登录。 1. 运行以下命令来获取集群版本： 2. 获取发行镜像 SHA 号： 3. 运行发行镜像容器，并提取与集群当前发行版本一起打包的内核版本： 输 输出示例 出示例 这是版本附带的默认 realtime 内核版本。 注意 注意 [main] summary=Configuration changes profile inherited from performance 边缘网 网络 络的集群 的集群 271 注意 注意 realtime 内核由内核版本中的字符串 .rt 表示。 验证 验证 检查为集群当前发行版本列出的内核版本是否与集群中运行的实际实时内核匹配。运行以下命令检查运行 的 realtime 内核版本： 1. 打开到集群节点的远程 shell 连接： 2. 检查 realtime 内核版本： 输 输出示例 出示例 19.7.3. 检查是否应用推荐的集群配置

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 1.2.1 RealTime Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 1.2 1.2 User Guide 1.2.1 RealTime Feature 1.2.1.1 Coming Soon. 1.2.2 PyFlink + Flink ML 1.2.2.1 Coming Soon. 1.3 Frequently Asked

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 1.2.1 RealTime Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 1.2 1.2 User Guide 1.2.1 RealTime Feature 1.2.1.1 Coming Soon. 1.2.2 PyFlink + Flink ML 1.2.2.1 Coming Soon. 1.3 Frequently Asked

tables. • Realtime rollups; The materialization expression can include aggregation expressions in which case, Vitess will create a rolled up version of the source table which can be used for realtime analytics this process. -enable_realtime_stats boolean Required for the Realtime Stats view. If set, vtctld will maintain a streaming RPC to each tablet (in all cells) to gather the realtime health stats. -enable_transaction_limit