{"id":3196,"date":"2024-04-02T15:46:16","date_gmt":"2024-04-02T07:46:16","guid":{"rendered":"https:\/\/www.yatenglg.cn\/blog\/?p=3196"},"modified":"2024-04-02T15:46:54","modified_gmt":"2024-04-02T07:46:54","slug":"python-%e5%85%b1%e4%ba%ab%e5%86%85%e5%ad%98","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=3196","title":{"rendered":"python \u5171\u4eab\u5185\u5b58"},"content":{"rendered":"\n<p>multiprocessing.shared_memory&nbsp;&#8212; \u53ef\u4ece\u8fdb\u7a0b\u76f4\u63a5\u8bbf\u95ee\u7684\u5171\u4eab\u5185\u5b58<\/p>\n\n\n\n<h2>\u6587\u4ef6shared_memory1.py\u521b\u5efa\u5171\u4eab\u5185\u5b58\uff0c\u5e76\u4ece\u5185\u5b58\u4e2d\u8bfb\u53d6\u6570\u636e\u8fdb\u884c\u5904\u7406<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code># -*- coding: utf-8 -*-\n# @Author  : LG\n\nfrom multiprocessing.shared_memory import SharedMemory\nimport numpy as np\nimport time\n\n\ndef main():\n    # \u521b\u5efa\u5171\u4eab\u5185\u5b58\n    int_buffer = SharedMemory(name='shared_memory_int', create=True, size=4)\n    str_buffer = SharedMemory(name='shared_memory_str', create=True, size=1024)\n    np_buffer = SharedMemory(name='shared_memory_numpy', create=True, size=48)  # 2x3, float64\n    tag_buffer = SharedMemory(name='shared_memory_tag', create=True, size=1)\n\n    # \u5199\u5165\u6807\u8bc6\u7b26\n    tag_buffer.buf&#91;:1] = int(0).to_bytes(1, 'little')\n\n    while True:\n        tag = int.from_bytes(tag_buffer.buf&#91;:1], 'little')\n        if tag == 1:\n            int_arg = int.from_bytes(int_buffer.buf&#91;:4], 'little')\n            str_length = int.from_bytes(str_buffer.buf&#91;:4], 'little')\n            str_arg = bytes(str_buffer.buf&#91;4:4+str_length]).decode('utf-8')\n            np_data = np.ndarray(shape=(3, 2), dtype=np.float64, buffer=np_buffer.buf)\n\n            # deal with\n            int_arg = int_arg * 10\n            str_arg = str_arg + ' | deal with finished!'\n            np_data = np_data + 3\n            print('int: ', int_arg)\n            print('str: ', str_arg)\n            print('np : ', np_data)\n\n            # \u5199\u5165\u6807\u8bc6\u7b26\n            tag_buffer.buf&#91;:1] = int(0).to_bytes(1, 'little')\n\n        time.sleep(0.001)\n\nif __name__ == '__main__':\n    main()<\/code><\/pre>\n\n\n\n<h2>\u6587\u4ef6shared_memory2.py\u5c06\u6570\u636e\u5199\u5165\u5171\u4eab\u5185\u5b58\uff0c\u7531shared_memory1.py\u8fdb\u884c\u5904\u7406<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code># -*- coding: utf-8 -*-\n# @Author  : LG\n\nfrom multiprocessing.shared_memory import SharedMemory\nimport numpy as np\nimport datetime\nimport random\nimport time\n\ndef main():\n    int_buffer = SharedMemory(name='shared_memory_int')\n    str_buffer = SharedMemory(name='shared_memory_str')\n    np_buffer = SharedMemory(name='shared_memory_numpy')\n    tag_buffer = SharedMemory(name='shared_memory_tag')\n\n    while True:\n        int_arg = random.randint(0, 1024)\n        str_arg = 'Hello World! - {}'.format(datetime.datetime.now())\n        np_data = np.random.rand(2, 3)\n\n        print('int: ', int_arg)\n        print('str: ', str_arg)\n        print('np : ', np_data)\n\n        # \u5199\u5165\u4fe1\u606f\n        int_buffer.buf&#91;:4] = int(int_arg).to_bytes(4, 'little')\n\n        # \u524d\u56db\u4f4d\u5199\u5165\u5b57\u7b26\u4e32\u957f\u5ea6\uff0c\u56db\u4f4d\u540e\u5f00\u59cb\u5199\u5165\u5b57\u7b26\u4e32\n        b_str_arg = str_arg.encode('utf-8')\n        str_buffer.buf&#91;:4] = int(len(b_str_arg)).to_bytes(4, 'little')\n        str_buffer.buf&#91;4:4+len(b_str_arg)] = b_str_arg\n\n        np_array = np.ndarray(np_data.shape, dtype=np_data.dtype, buffer=np_buffer.buf)\n        np_array&#91;:] = np_data&#91;:]\n\n        # \u5199\u5165\u6807\u8bc6\u7b26\n        tag_buffer.buf&#91;:1] = int(1).to_bytes(1, 'little')\n\n        time.sleep(random.randint(0, 3000)\/1000)\n\n\nif __name__ == '__main__':\n    main()<\/code><\/pre>\n\n\n\n<p>\u672c\u65b9\u5f0f\u540c\u6837\u9002\u7528\u4e8e\u4e0d\u540c\u7f16\u7a0b\u8bed\u8a00\u4e0d\u540c\u8fdb\u7a0b\u4e4b\u95f4\u76f8\u4e92\u5904\u7406\u6570\u636e\uff0c\u5982python\u4e0ec++<\/p>\n\n\n\n<h2><\/h2>\n","protected":false},"excerpt":{"rendered":"<p>multiprocessing.shared_memory&nbsp;&#8212; \u53ef\u4ece\u8fdb\u7a0b\u76f4\u63a5\u8bbf\u95ee\u7684\u5171\u4eab\u5185&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3196"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3196"}],"version-history":[{"count":2,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3196\/revisions"}],"predecessor-version":[{"id":3198,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3196\/revisions\/3198"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3196"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}