{"id":93750,"date":"2020-04-14T19:20:33","date_gmt":"2020-04-14T11:20:33","guid":{"rendered":"http:\/\/4563.org\/?p=93750"},"modified":"2020-04-14T19:20:33","modified_gmt":"2020-04-14T11:20:33","slug":"%e4%b8%80%e4%b8%aa-python-gc-%e9%97%ae%e9%a2%98%ef%bc%8c%e8%99%bd%e7%84%b6%e8%a2%ab%e8%a7%a3%e5%86%b3%e4%ba%86%ef%bc%8c%e4%bd%86%e6%98%af%e8%bf%98%e6%98%af%e4%b8%8d%e6%87%82%e4%b8%ba%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=93750","title":{"rendered":"\u4e00\u4e2a Python GC \u95ee\u9898\uff0c\u867d\u7136\u88ab\u89e3\u51b3\u4e86\uff0c\u4f46\u662f\u8fd8\u662f\u4e0d\u61c2\u4e3a\u4ec0\u4e48"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  \u4e00\u4e2a Python GC \u95ee\u9898\uff0c\u867d\u7136\u88ab\u89e3\u51b3\u4e86\uff0c\u4f46\u662f\u8fd8\u662f\u4e0d\u61c2\u4e3a\u4ec0\u4e48               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : aladdindingding <\/span>  <span><i><\/i> 22<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\"> <\/p>\n<p>\u5c31\u662f\u6211\u4eec\u6709\u4e00\u4e2a redis \u7684\u516c\u5171\u6587\u4ef6\u81ea\u5b9a\u4e49\u4e86\u4e00\u4e2a\u65b9\u6cd5\u4f7f\u7528\u4e86 pipline\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff1a \u6bd4\u5982\u8fd9\u4e2a\u662f\u4e00\u6b21\u4ece\u4e00\u4e2a list \u4e00\u6b21 pop \u51fa\u591a\u4e2a\u5143\u7d20<\/p>\n<pre><code>def lpopn(self, name, n):  \"\"\"\u4e00\u6b21 pop \u591a\u4e2a\u5143\u7d20\"\"\"     pipe = self.pipeline()     pipe.lrange(name, 0, n - 1)     pipe.ltrim(name, n, -1)     raw_list, is_succ = pipe.execute()     return raw_list <\/code><\/pre>\n<p>\u4e4b\u524d\u5199\u4e86\u4e00\u4e2a\u811a\u672c\u7528\u6765\u6536\u96c6 redis \u4e2d\u7684\u6570\u636e\u5165\u5e93\u7528\u4e86\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u5bfc\u81f4\u811a\u672c\u8fd0\u884c\u65f6\u53d1\u73b0\u4e86\u5185\u5b58\u6cc4\u6f0f\uff0c\u7136\u540e\u4f7f\u7528\u5185\u5b58\u76d1\u63a7\u5de5\u5177\u5b9a\u4f4d\u5230\u4e86\u662f\u8fd9\u4e2a redis.client.Pipeline \u8fd9\u4e2a\u5bf9\u8c61\u5360\u7528\u4e86\u5927\u91cf\u5185\u5b58\uff0c\u4e4b\u524d\u8bb0\u5f97\u6709 python \u7684\u5751\u8bf4\u7684\u662f \u5982\u679c\u5728\u5faa\u73af\u5f15\u7528\u4e2d\u7684\u5bf9\u8c61\u5b9a\u4e49\u4e86 del,\u90a3\u4e48 python gc \u4e0d\u80fd\u8fdb\u884c\u56de\u6536\uff0c\u7136\u540e\u6211\u5c31\u70b9\u8fdb pipeline \u91cc\u9762\u770b\u786e\u5b9e\u662f\u5b9a\u4e49\u4e86 del<\/p>\n<pre><code>class Pipeline(BasePipeline, Redis):     \"Pipeline for the Redis class\"     pass      class BasePipeline(object):   # \u7701\u7565\u4e86\u5176\u4ed6\u65b9\u6cd5     def __del__(self):         try:             self.reset()         except Exception:             pass <\/code><\/pre>\n<p>\u7136\u540e\u6211\u5c31\u6539\u6210 \u811a\u672c\u91cc\u9762\u5168\u5c40\u521b\u5efa\u4e00\u4e2a pipline \u5bf9\u8c61\u4f20\u8fdb\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u7136\u540e\u95ee\u9898\u5c31\u89e3\u51b3\u4e86\uff0c\u4f46\u662f\u4e0d\u660e\u767d\u8fd9\u4e2a pipeline \u600e\u4e48\u5c31\u5faa\u73af\u5f15\u7528\u4e86\u5462\uff0c\u4e0d\u77e5\u9053\u662f\u4e0d\u662f\u8fd9\u4e2a\u539f\u56e0\uff0c\u5e0c\u671b\u6709 v \u53cb\u80fd\u89e3\u7b54\u4e00\u4e0b\u7591\u60d1\uff0c\u7ed9\u70b9\u601d\u8def<\/p>\n<\/p><\/div>\n<div> <b>\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (<span>4<\/span>)        <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<ul>\n<li data-pid=\"1166774\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : linw1995 <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             \u5e94\u8be5\u662f\u6267\u884c self.reset() \u7ed9 pipeline \u5e26\u6765\u65b0\u7684\u5f15\u7528\uff1f\u5bfc\u81f4\u56de\u6536\u4e0d\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n<li data-pid=\"1166775\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u4e3b<\/span> <span>\u8cc7\u6df1\u5927\u4f6c : aladdindingding <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             @linw1995 reset()\u5e94\u8be5\u662f\u91cd\u7f6e redis \u4e8b\u52a1\u4e00\u4e9b\u53c2\u6570\u7684 \u5e94\u8be5\u6ca1\u6709\u5e26\u6765\u65b0\u7684\u5f15\u7528\u5427                                                            <\/div>\n<\/p><\/div>\n<\/li>\n<li data-pid=\"1166776\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : xiaolinjia <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             \u6211\u770b\u4ed6\u5b9a\u4e49\u4e86 enter \u548c exit \u9b54\u6cd5\u65b9\u6cd5\u3002\u4e0d\u5982\u8bd5\u8bd5<br \/>with self.pipeline() as pipe: \uff1f<br \/>\u4e0d\u8fc7\u6211\u770b\u4ed6\u4ee3\u7801\u662f\u4e00\u6837\u7684\uff0c\u5927\u6982\u662f del \u7684\u65f6\u5019\u51fa\u5f02\u5e38\u4e86\uff1f\u5bfc\u81f4 reset \u6ca1\u6267\u884c\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n<li data-pid=\"1166777\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : linw1995 <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             @aladdindingding \u4f60\u53d1\u7684\u4ee3\u7801\u53c8\u4e0d\u5168\u3002\u5efa\u8bae\u7528 tracemalloc \u770b\u770b\u662f\u4e0d\u662f redis.client.Pipeline, \u518d\u7528 objgraph \u770b\u770b\u53c8\u6ca1\u6709\u88ab\u751f\u5b58\u5468\u671f\u957f\u7684\u5bf9\u8c61\u5f15\u7528\u5230\u3002\u6ca1\u6709\u5c31\u5e94\u8be5\u662f\u88ab `__del__` \u7ed9\u590d\u6d3b\u4e86\u3002https:\/\/www.python.org\/dev\/peps\/pep-0442\/                                                            <\/div>\n<\/p><\/div>\n<\/li>\n<li>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u4e2a Python GC \u95ee\u9898\uff0c\u867d&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/93750"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=93750"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/93750\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=93750"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=93750"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=93750"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}