多线程thread和多进程Process 代码:log.info("=== test multiple thread singleton ===") import time, threading def singleThreadDo(): log.info("--- singleThreadDo ---") cur_thread = threading.current_thread() cur_thread_name = cur_thread.name curThreadTokenSingleton = MsTtsTokenSingleton() ...
importthreadingimporttimedeftest_thread_safety():globalshared_variable shared_variable=0lock=threading.Lock()# 线程任务defworker():nonlocalshared_variablefor_inrange(100):withlock:local_var=shared_variable time.sleep(0.01)# 模拟一些复杂的计算shared_variable=local_var+1threads=[threading.Thread(target=...
比如L.append(x)和L.pop()就是原子操作，所以是thread安全。如果操作不是原子的，或者涉及修改多个列表...
Thread safety is a computer programming concept applicable in the context of multi-threaded programs. A piece of code is thread-safe if it functions correctly during simultaneous execution by multiple threads. In particular, it must satisfy the need for multiple threads to access the same shared d...
queue.PriorityQueue基于heapq实现,加了thread-safety。性能上会慢 queue.PriorityQueue只有queue的基本操作,没有heapq灵活 heapq详解 Heap queue algorithm heap[k] <= heap[2*k+1]andheap[k] <= heap[2*k+2] 和textbook上的堆算法有两点不同: 1. index从0开始 2. 小顶堆。textbook更多是大顶,便于原地排序...
for t inThreadList: t.join() 性能 python GIL 性能 启动一个执行死循环的线程,CPU占有率可以达到100% 启动与CPU核心数量相同的N个线程,在4核CPU上可以监控到CPU占用率仅有160%,也就是使用不到两核。 即使启动100个线程,使用率也就170%左右,仍然不到两核。
DB-API2 规范中 threadsafety 字段取值 7. 创建连接池 使用PooledDB 连接池,我们首先要创建一个连接池对象。 def __init__( self, creator, mincached=0, maxcached=0, maxshared =0, maxconnections=0, blocking=False, maxusage=None, setsession=None, reset=True, failures=None, ping=1,args, *kw...
Following PEP 703, the GIL is expected to be removed in main line Python in a few years. Python 3.13 is the first version to support disabling it (as a build-time option, mainly for testing). The success of this multi-year long procedure...
3.1.2.2 dmPython.threadsafety 支持线程的安全级别。当前值为 1,线程可以共享模块,但不能共享连接。 3.1.2.3 dmPython.paramstyle 支持的标志参数格式。当前值为‘qmark’,支持‘?’按位置顺序绑定,不支持按名称绑定参数。 例如: ("insert into test(c1, c2) values(?, ?)", 1, 2) 3.1.2.4 dmPytho...
都是用multiprocessing解决的, 但是随之而来的就是内存占用, context switch,IPC, 和 fork-safety 相关...