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README
Apache-2.0

并发编程框架FFRT

简介

FFRT: Function Flow Runtime, 一种并发编程框架,提供以数据依赖的方式构建异步并发任务的能力;包括数据依赖管理、任务执行器、系统事件处理等。并采用基于协程的任务执行方式,可以提高任务并行度、提升线程利用率、降低系统线程总数;充分利用多核平台的计算资源,保证系统对所有资源的集约化管理。最终解决系统线程资源滥用问题,打造极致用户体验。

功能介绍详见: FFRT用户指南(docs/user_guide.md)

目录


├── benchmarks                  # 性能对比测试用例
├── docs                        # 用户指南
├── examples                    # 使用案例
├── interfaces                  # 对外接口目录
│   └── kits
│       ├── c
│       └── cpp
├── scripts
├── src
│   ├── core                    # 依赖管理模块
│   ├── dfx                     # 维测功能
│   │   ├── bbox                # 黑匣子功能实现
│   │   ├── log                 # 日志功能
│   │   └── trace               # trace功能
│   ├── eu                      # 执行单元
│   ├── internal_inc            # 对内接口目录
│   ├── queue
│   ├── sched
│   ├── sync
│   └── util
├── test
└── tools
    └── ffrt_trace_process

约束

编译构建

Linux编译:

快速编译执行example用例:

    ./scripts/run_example.sh

LOG配置

  1. LOG输出函数可以查看头文件ffrt_log_api.h
  2. 提供4个日志级别: FFRT_LOG_ERROR = 0, FFRT_LOG_WARN = 1, FFRT_LOG_INFO = 2, FFRT_LOG_DEBUG = 3, 可通过静态编译宏FFRT_LOG_LEVEL来设置日志级别,默认为ERROR
  3. 可通过环境变量FFRT_LOG_LEVEL动态设置ffrt日志级别。示例,设置日志DEBUG级别:
    export FFRT_LOG_LEVEL=3  //3为FFRT_LOG_DEBUG的值

Benchmarks

测试场景

  1. fork_join:通过构造fork/join执行时间,模拟线程创建和堵塞场景;
  2. fib:通过构造斐波那契序列,模拟嵌套调用场景;
  3. face_story:通过构造人脸数据,模拟人脸检测场景;

测试方法

    cd benchmarks
    ./benchmarks count //count表明执行次数

测试结果

  1. 测试数据和分析归档到benchmarks/output/tag_${stamp}/benchmark_${stamp}.svg,其中stamp是最近一次commit提交时间
  2. 测试结果已取平均
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