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社区首页 >专栏 >Python多核心运算 (Multi-Core Computing)

Python多核心运算 (Multi-Core Computing)

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杨丝儿
发布2022-03-01 13:14:18
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发布2022-03-01 13:14:18
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文章被收录于专栏:杨丝儿的小站杨丝儿的小站

one argument process

Notice that args should be itrable. like index. But we can use a little trick to tackle none iterable ones.

代码语言:javascript
复制
def func(resolver):
    return resolver.getFormatedVocaloidDataInDict()

We put a “,” after none iterable args.

代码语言:javascript
复制
results = [pool.apply_async(func, args=(resolverX,)) for resolverX in [resolver for i in range(num_cores)]]

template

代码语言:javascript
复制
# import datetime
import multiprocessing as mp

# # initialise the pool
num_cores = int(mp.cpu_count())
# print("本地计算机有: " + str(num_cores) + " 核心")
pool = mp.Pool(num_cores)

# # preparation processes
processes = [pool.apply_async(func0, args=(arg0,)) for arg0 in argList]
processes.append(pool.apply_async(func1, args=(argX,)))

# start_t = datetime.datetime.now()
results = [p.get() for p in processes]
# end_t = datetime.datetime.now()

# elapsed_sec = (end_t - start_t).total_seconds()
# print("多进程计算 共消耗: " + "{:.2f}".format(elapsed_sec) + " 秒")
  1. func0 and func1 can be lambda func.
  2. prepare processes not starting any processes, so cost are really small.
  3. if func has return we use .get(), or .start() is enough

example

代码语言:javascript
复制
import math
import datetime
import multiprocessing as mp


def func(name, resolver):
    return{name: resolver.getFormatedVocaloidDataInDict()}


if __name__ == '__main__':

    start_t = datetime.datetime.now()

    num_cores = int(mp.cpu_count())
    print("本地计算机有: " + str(num_cores) + " 核心")

    pool = mp.Pool(num_cores)

    results = [pool.apply_async(func, args=(name,resolverX)) for name, resolverX in [(i, resolver) for i in range(num_cores)]]
    
    results = [p.get() for p in results]

    end_t = datetime.datetime.now()
    elapsed_sec = (end_t - start_t).total_seconds()
    print("多进程计算 共消耗: " + "{:.2f}".format(elapsed_sec) + " 秒")

questions

jupyter notebook not support multiprocessing package -> try multiprocess instead of multiprocessing https://stackoverflow.com/questions/48846085/python-multiprocessing-within-jupyter-notebook

progress bar -> https://www.jianshu.com/p/1d6e0d07eb4a

gpu acceleration -> https://www.cnblogs.com/noluye/p/11517489.html

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目录
  • one argument process
  • template
  • example
  • questions
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