allowsGroupOpacity • shouldRasterize for layer which not redrawn ## Database ## Data Needs • Threading • I/O Performance • Query Performance • Migration • Model Relationship ## CoreData or Realm CoreData • Build in Support • Package Size • GUI Support ## Realm • Great Threading Support • Faster • But Fat ## Threading CoreData Notification Realm Sync When Commit use Batch update ## Network

Introduction II Julia v1.3 Release Notes 2 New language features 3 Language changes 4 Multi-threading changes 5 Build system changes 6 New library functions 7 Standard library changes Libdl 31 Parallel Computing ..... 273 32 Coroutines ..... 275 32.1 Channels ..... 275 33 Multi-Threading (Experimental) ..... 279 33.1 Setup ..... 279 33.2 The @threads Macro ..... 279 33.3 Atomic 57.8 Combinatorics ..... 739 58 Tasks ..... 743 59 Scheduling ..... 749 60 Multi-Threading ..... 757 60.1 ccall using a threadpool (Experimental) ..... 762 61 Low-level synchronization

Channels ..... 315 24.3 More task operations ..... 319 24.4 Tasks and events ..... 320 25 Multi-Threading 321 25.1 Starting Julia with multiple threads 321 25.2 Threadpools 323 25.3 The @threads Macro Channels ..... 1143 49.4 Low-level synchronization using schedule and wait ..... 1150 50 Multi-Threading 50.1 Atomic operations ..... 1159 50.2 ccall using a libuv threadpool (Experimental) ..... 1172 Julia runtime 1928 106.18 Bounds checking 1930 106.19 Proper maintenance and care of multi-threading locks 1932 106.20 Arrays with custom indices 1936 106.21 Module loading 1939 106.22 Inference

Communicating with Channels 315 24.3 More task operations 319 24.4 Tasks and events ..... 320 25 Multi-Threading ..... 321 25.1 Starting Julia with multiple threads ..... 321 25.2 Threadpools ..... 323 25 Channels ..... 1145 49.4 Low-level synchronization using schedule and wait ..... 1152 50 Multi-Threading 50.1 Atomic operations ..... 1161 50.2 ccall using a libuv threadpool (Experimental) ..... 1174 runtime ..... 1931 106.18 Bounds checking ..... 1933 106.19 Proper maintenance and care of multi-threading locks ..... 1935 106.20 Arrays with custom indices ..... 1938 106.21 Module loading ..... 1942

Channels ..... 315 24.3 More task operations ..... 319 24.4 Tasks and events ..... 320 25 Multi-Threading 321 25.1 Starting Julia with multiple threads 321 25.2 Threadpools 323 25.3 The @threads Macro Channels ..... 1142 49.4 Low-level synchronization using schedule and wait ..... 1149 50 Multi-Threading 50.1 Atomic operations ..... 1158 50.2 ccall using a libuv threadpool (Experimental) ..... 1171 Channels ..... 1142 49.4 Low-level synchronization using schedule and wait ..... 1149 50 Multi-Threading 50.1 Atomic operations ..... 1158 50.2 ccall using a libuv threadpool (Experimental) ..... 1171

Host provides view (e.g. NSView) - Host requests view (e.g. NSView) - We create an OS window ## Threading model - Hosts can call us from any thread Each host may do this differently ![Image](/uploads

runserver #再次运行应用程序 ## ★schedule 模块 # pip3 install schedule import schedule import time import threading # 定义任务 def job(var1): print("Hello " + var1) # schedule.every(5).seconds.do(job scheduler_thread(): while True: schedule.run_pending() time.sleep(1) # 启动调度器线程 thread = threading.Thread(target=scheduler_thread) thread.start() schedule.run_all() # 立即运行所有作业 schedule.run_all(delay_seconds=10) 293702602386475 ### ★多线程 threading.Thread 类 python 多线程（multi-thread）适用于 I/O 密集型的任务，对于计算密集型任务应该使用多进程（multi-process） Python3 有两个标准库 _thread 和 threading 提供对线程的支持 python2 为 thread 和 threading 模块 ## ★简单线程_thread

for I/O 完成 ..... 601 16.2 threading — Higher-level threading interface ..... 606 16.3 thread — Multiple threads of control ..... 616 16.4 dummy_threading — 可直接替代 threading 模块 ..... 618 16.5 dummy_thread dummy_thread — Drop-in replacement for the thread module ..... 618 16.6 multiprocessing—Process-based “threading” interface 618 16.7 mmap—内存映射文件支持 670 16.8 readline—GNU readline 接口 673 16.9 rlcompleter—GNU is empty. Instead, the preferred approach is to use the threading.Timer class instead. 示例: >>> import time >>> from threading import Timer >>> def print_time(): ... print

for I/O 完成 ..... 601 16.2 threading —Higher-level threading interface ..... 606 16.3 thread —Multiple threads of control ..... 616 16.4 dummy_threading —可直接替代 threading 模块 ..... 618 16.5 dummy_thread dummy_thread —Drop-in replacement for the thread module ..... 618 16.6 multiprocessing—Process-based “threading” interface 618 16.7 mmap—内存映射文件支持 670 16.8 readline—GNU readline 接口 673 16.9 rlcompleter—GNU is empty. Instead, the preferred approach is to use the threading.Timer class instead. 示例: >>> import time >>> from threading import Timer >>> def print_time(): ... print