python处理多进程,当创建多余60个进行,报错ValueError: need at most 63 handles, got a sequence of length 63

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python处理多进程,当创建多余60个进行,报错ValueError: need at most 63 handles, got a sequence of length 63
主要代码块如下:

    def main(self):
        print(f'Parent process {os.getpid()}')
        p = Pool(60)  # 用Pool进程池,创建进程,超过60会报错ValueError: need at most 63 handles, got a sequence of length 63
        result = []
        rurntime = time.time() # 用于记录执行时长
        i = 0  # 用于记录执行的任务数
        for i in range(100):
            result.append(p.apply_async(self.pool_rum, args=(i,)))
        p.close()
        p.join()
        for res in result:
            print(res.get())
        print('All subprocesses done')