{"id":10008035,"date":"2023-07-05T10:59:02","date_gmt":"2023-07-05T02:59:02","guid":{"rendered":"https:\/\/ityet.com\/?p=10008035"},"modified":"2023-07-05T10:59:02","modified_gmt":"2023-07-05T02:59:02","slug":"redis-issue-%e5%88%86%e6%9e%90%ef%bc%9a%e6%b5%81%e6%95%b0%e6%8d%ae%e8%af%bb%e5%86%99%e5%af%bc%e8%87%b4%e7%9a%84%e6%ad%bb%e9%94%81%e9%97%ae%e9%a2%981","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008035","title":{"rendered":"Redis Issue \u5206\u6790\uff1a\u6d41\u6570\u636e\u8bfb\u5199\u5bfc\u81f4\u7684\u201c\u6b7b\u9501\u201d\u95ee\u9898(1)"},"content":{"rendered":"<p>Redis \u9879\u76ee\u4e2d\uff0c\u4e00\u4e2a\u540d\u4e3a &#8220;[BUG] Deadlock with streams on redis 7.2&#8221; \u7684 <a href=\"https:\/\/link.segmentfault.com\/?enc=DSsfWygKJTrVealJ6EV69w%3D%3D.Ywo9vAz992cg2b9Y4nXtk1Zy6IHq7TcOAdViYpCZmurU2654n8dFw1WaEp2o0nPY\" rel=\"nofollow\">issue 12290<\/a> \u5438\u5f15\u4e86\u6211\u7684\u6ce8\u610f\u3002\u8fd9\u4e2a bug \u4e2d\uff0credis \u670d\u52a1\u5668\u5728\u5904\u7406\u7279\u5b9a\u7684\u5ba2\u6237\u7aef\u8bf7\u6c42\u65f6\u9677\u5165\u4e86\u6b7b\u5faa\u73af\uff0c\u8fd9\u4e2a\u73b0\u8c61\u5728 redis \u8fd9\u6837\u7684\u9ad8\u6027\u80fd\u3001\u9ad8\u53ef\u9760\u6027\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u662f\u6781\u4e3a\u7f55\u89c1\u7684\u3002<\/p>\n<p>\u8fd9\u4e2a Issue \u4e0d\u4ec5\u4ec5\u662f\u4e00\u4e2a\u666e\u901a\u7684 bug \u62a5\u544a\uff0c\u5b83\u5b9e\u9645\u4e0a\u662f\u4e00\u6b21\u6df1\u5165\u63a2\u7d22 Redis \u5185\u90e8\u673a\u5236\u7684\u5b66\u4e60\u8fc7\u7a0b\u3002\u4ece\u95ee\u9898\u7684\u53d1\u73b0\uff0c\u5230\u590d\u73b0\u6b65\u9aa4\u7684\u8be6\u7ec6\u63cf\u8ff0\uff0c\u518d\u5230\u95ee\u9898\u7684\u6df1\u5165\u5206\u6790\uff0c\u6700\u540e\u5230\u89e3\u51b3\u65b9\u6848\u7684\u63d0\u51fa\uff0c\u6bcf\u4e00\u6b65\u90fd\u5145\u6ee1\u4e86\u6311\u6218\u548c\u53d1\u73b0\u3002\u65e0\u8bba\u4f60\u662f Redis \u7684\u4f7f\u7528\u8005\uff0c\u8fd8\u662f\u5bf9\u6570\u636e\u5e93\u5185\u90e8\u673a\u5236\u611f\u5174\u8da3\u7684\u5f00\u53d1\u8005\uff0c\u6211\u76f8\u4fe1\u4f60\u90fd\u80fd\u4ece\u8fd9\u4e2a issue \u4e2d\u83b7\u5f97\u6709\u4ef7\u503c\u7684\u542f\u793a\u3002<\/p>\n<p>\u5728\u5f00\u59cb\u7814\u7a76\u8fd9\u4e2a bug \u4e4b\u524d\uff0c\u6211\u4eec\u5148\u7b80\u5355\u4e86\u89e3\u4e0b\u8fd9\u91cc\u7684\u80cc\u666f\u77e5\u8bc6\uff1aredis \u7684<a href=\"https:\/\/link.segmentfault.com\/?enc=OUBofZ9WyD90SYjnfoeAJw%3D%3D.hPH0jUe%2BUCGzx%2Fd9dD6TnOfauz%2F1S1bUUANL1O5zqQ5LP1UHxHhwhGsgho%2FvGWYyXkOYPfQCq5%2BjQel%2FMF1waw%3D%3D\" rel=\"nofollow\">\u6d41\u6570\u636e\u7c7b\u578b<\/a>\u3002<\/p>\n<h2>Redis streams \u4ecb\u7ecd<\/h2>\n<p>\u4e3a\u4e86\u652f\u6301\u66f4\u5f3a\u5927\u548c\u7075\u6d3b\u7684\u6d41\u5904\u7406\u80fd\u529b\uff0cRedis \u5728 5.0 \u652f\u6301\u4e86<a href=\"https:\/\/link.segmentfault.com\/?enc=%2Bj2MdEh6QwBLHlsKg8x0MQ%3D%3D.NAL0OxZjlWexOv199ihicaRx8Ha8rJHgyggwt0gZ6xKxZf7FQpyhgJFcYAHnu307B%2F6NYYsCi6%2F2%2Fut0wL0cpg%3D%3D\" rel=\"nofollow\">\u6d41\u6570\u636e\u7c7b\u578b<\/a>\uff0c \u5305\u542b XADD, XREAD \u548c XREADGROUP\u3002<\/p>\n<ul>\n<li><code>XADD<\/code> \u547d\u4ee4\u5141\u8bb8\u7528\u6237\u5411 Redis \u6d41\u4e2d\u6dfb\u52a0\u65b0\u7684\u6d88\u606f\u3002\u6bcf\u4e2a\u6d88\u606f\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684 ID \u548c\u4e00\u7ec4\u5b57\u6bb5-\u503c\u5bf9\u3002\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u975e\u5e38\u9002\u5408\u8868\u793a\u65f6\u95f4\u5e8f\u5217\u6570\u636e\uff0c\u4f8b\u5982\u65e5\u5fd7\u3001\u4f20\u611f\u5668\u8bfb\u6570\u7b49\u3002\u901a\u8fc7 XADD\uff0c\u7528\u6237\u53ef\u4ee5\u5c06\u8fd9\u4e9b\u6570\u636e\u5b58\u50a8\u5728 Redis \u4e2d\uff0c\u7136\u540e\u4f7f\u7528\u5176\u4ed6\u547d\u4ee4\u8fdb\u884c\u67e5\u8be2\u548c\u5904\u7406\u3002<\/li>\n<li><code>XREAD<\/code> \u547d\u4ee4\u7528\u4e8e\u4ece\u4e00\u4e2a\u6216\u591a\u4e2a\u6d41\u4e2d\u8bfb\u53d6\u6570\u636e\u3002\u4f60\u53ef\u4ee5\u6307\u5b9a\u4ece\u6bcf\u4e2a\u6d41\u7684\u54ea\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u8bfb\u53d6\uff0c\u4ee5\u53ca\u6700\u591a\u8bfb\u53d6\u591a\u5c11\u6761\u6d88\u606f\u3002\u8fd9\u4e2a\u547d\u4ee4\u9002\u5408\u4e8e\u7b80\u5355\u7684\u6d41\u5904\u7406\u573a\u666f\uff0c\u4f8b\u5982\uff0c\u4f60\u53ea\u9700\u8981\u4ece\u6d41\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u800c\u4e0d\u9700\u8981\u8ddf\u8e2a\u8bfb\u53d6\u7684\u8fdb\u5ea6\u3002<\/li>\n<li><code>XREADGROUP<\/code> \u547d\u4ee4\u662f Redis \u6d88\u8d39\u8005\u7ec4\u529f\u80fd\u7684\u4e00\u90e8\u5206\u3002\u6d88\u8d39\u8005\u7ec4\u5141\u8bb8\u591a\u4e2a\u6d88\u8d39\u8005\u5171\u4eab\u5bf9\u540c\u4e00\u4e2a\u6d41\u7684\u8bbf\u95ee\uff0c\u540c\u65f6\u8fd8\u80fd\u8ddf\u8e2a\u6bcf\u4e2a\u6d88\u8d39\u8005\u7684\u8fdb\u5ea6\u3002\u8fd9\u79cd\u529f\u80fd\u5bf9\u4e8e\u6784\u5efa\u53ef\u6269\u5c55\u7684\u6d41\u5904\u7406\u7cfb\u7edf\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u6709\u591a\u4e2a\u6d88\u8d39\u8005\u540c\u65f6\u8bfb\u53d6\u540c\u4e00\u4e2a\u6d41\uff0c\u6bcf\u4e2a\u6d88\u8d39\u8005\u5904\u7406\u6d41\u4e2d\u7684\u4e00\u90e8\u5206\u6d88\u606f\u3002\u901a\u8fc7 XREADGROUP\uff0c\u6bcf\u4e2a\u6d88\u8d39\u8005\u90fd\u53ef\u4ee5\u8bb0\u4f4f\u5b83\u5df2\u7ecf\u8bfb\u53d6\u5230\u54ea\u91cc\uff0c\u4ece\u800c\u5728\u4e0b\u6b21\u8bfb\u53d6\u65f6\u4ece\u6b63\u786e\u7684\u4f4d\u7f6e\u5f00\u59cb\u3002<\/li>\n<\/ul>\n<p>\u6211\u4eec\u53ef\u4ee5\u7528 XREADGROUP \u547d\u4ee4\u4ece\u4e00\u4e2a\u7279\u5b9a\u7684\u6d41\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u5982\u679c\u8fd9\u4e2a\u6d41\u5f53\u524d\u6ca1\u6709\u65b0\u7684\u6570\u636e\uff0c\u90a3\u4e48\u53d1\u51fa XREADGROUP \u547d\u4ee4\u7684\u5ba2\u6237\u7aef\u5c31\u4f1a\u8fdb\u5165\u4e00\u79cd<code>\u963b\u585e\u7b49\u5f85<\/code>\u72b6\u6001\uff0c\u76f4\u5230\u6d41\u4e2d\u6709\u65b0\u7684\u6570\u636e\u4e3a\u6b62\u3002\u540c\u6837\u7684\uff0c\u6211\u4eec\u53ef\u4ee5\u7528 XADD \u547d\u4ee4\u5411\u6d41\u4e2d\u6dfb\u52a0\u65b0\u7684\u6570\u636e\uff0c\u5f53\u65b0\u7684\u6570\u636e\u88ab\u6dfb\u52a0\u5230\u6d41\u4e2d\u540e\uff0c\u6240\u6709\u5728\u8fd9\u4e2a\u6d41\u4e0a&#8221;\u7b49\u5f85&#8221;\u7684\u5ba2\u6237\u7aef\u5c31\u4f1a<code>\u88ab\u5524\u9192<\/code>\uff0c\u7136\u540e\u5f00\u59cb\u5904\u7406\u65b0\u7684\u6570\u636e\u3002<\/p>\n<p>\u6ce8\u610f\u8fd9\u91cc\u7684&#8221;\u7b49\u5f85&#8221;\u5e76\u4e0d\u662f\u6211\u4eec\u901a\u5e38\u7406\u89e3\u7684\u90a3\u79cd\u8ba9\u6574\u4e2a\u670d\u52a1\u5668\u505c\u4e0b\u6765\u7684\u963b\u585e\u3002\u5b9e\u9645\u4e0a\uff0c\u53ea\u6709\u53d1\u51fa XREADGROUP \u547d\u4ee4\u7684\u90a3\u4e2a\u5ba2\u6237\u7aef\u4f1a\u8fdb\u5165&#8221;\u7b49\u5f85&#8221;\u72b6\u6001\uff0c\u800c Redis \u670d\u52a1\u5668\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u5904\u7406\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u3002\u8fd9\u5c31\u610f\u5473\u7740\uff0c\u5373\u4f7f\u6709\u4e00\u4e9b\u5ba2\u6237\u7aef\u5728\u7b49\u5f85\u65b0\u7684\u6570\u636e\uff0cRedis \u670d\u52a1\u5668\u4e5f\u80fd\u4fdd\u6301\u9ad8\u6548\u7684\u8fd0\u884c\u3002<\/p>\n<p>\u66f4\u591a\u5185\u5bb9\u53ef\u4ee5\u53c2\u8003 Redis \u5b98\u65b9\u6587\u6863\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=KfLoaPyIn%2F8lmdV9VcjKlw%3D%3D.6A6RtDFYjvYLLH8Shuyzo49LEzHI3n2QpHzYDKEI4L3049t9cKZpMBDBUdGzluZWNJkRX%2FaAFHWpVUe1G3QJkg%3D%3D\" rel=\"nofollow\">Redis Streams tutorial<\/a>\u3002<\/p>\n<h2>Bug \u590d\u73b0<\/h2>\n<p>\u597d\u4e86\uff0c\u6211\u4eec\u53ef\u4ee5\u6765\u6df1\u5165\u7814\u7a76\u8fd9\u4e2a bug \u4e86\uff0c\u9996\u5148\u6211\u4eec\u6765\u770b\u4e0b\u590d\u73b0\u811a\u672c\u3002\u4e00\u5171\u4e24\u4e2a\u811a\u672c\uff0c\u4e00\u4e2a\u6d88\u8d39\u8ba2\u9605\u8005\uff0c\u4e00\u4e2a\u53d1\u5e03\u8005\uff0c\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li>subscriber.py\uff1a\u8fd9\u4e2a\u811a\u672c\u521b\u5efa\u4e86\u4e00\u7ec4\u8ba2\u9605\u8005\uff0c\u6bcf\u4e2a\u8ba2\u9605\u8005\u90fd\u5c1d\u8bd5\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a &#8216;test&#8217; \u7684\u4efb\u52a1\u961f\u5217\uff0c\u5e76\u6301\u7eed\u4ece\u8be5\u961f\u5217\u4e2d\u8bfb\u53d6\u65b0\u7684\u6d41\u3002\u5982\u679c\u6ca1\u6709\u65b0\u7684\u6d41\uff0c\u8ba2\u9605\u8005\u4f1a\u6682\u505c 5 \u79d2\u949f\uff0c\u7136\u540e\u7ee7\u7eed\u5c1d\u8bd5\u8bfb\u53d6\u3002\u5982\u679c\u8bfb\u53d6\u5230\u65b0\u7684\u6d41\uff0c\u8ba2\u9605\u8005\u4f1a\u6253\u5370\u51fa\u65b0\u7684\u6d41\u3002\u8fd9\u4e2a\u811a\u672c\u4f1a\u6301\u7eed\u8fd0\u884c\uff0c\u76f4\u5230\u6240\u6709\u7684\u8ba2\u9605\u8005\u8fdb\u7a0b\u90fd\u7ed3\u675f\u3002<\/li>\n<li>feeder.py\uff1a\u8fd9\u4e2a\u811a\u672c\u5728\u540c\u4e00\u4e2a\u4efb\u52a1\u961f\u5217\u4e2d\u6dfb\u52a0\u65b0\u7684\u4efb\u52a1\u3002\u5b83\u521b\u5efa\u4e86\u4e00\u7ec4\u53d1\u5e03\u8005\uff0c\u6bcf\u4e2a\u53d1\u5e03\u8005\u90fd\u4f1a\u5728\u4efb\u52a1\u961f\u5217\u4e2d\u6dfb\u52a0\u65b0\u7684\u4efb\u52a1\uff0c\u5e76\u5728\u6bcf\u6b21\u6dfb\u52a0\u4efb\u52a1\u540e\u6682\u505c 0.1 \u79d2\u949f\u3002\u8fd9\u4e2a\u811a\u672c\u4f1a\u6301\u7eed\u8fd0\u884c\uff0c\u76f4\u5230\u6240\u6709\u7684\u53d1\u5e03\u8005\u8fdb\u7a0b\u90fd\u7ed3\u675f\u3002<\/li>\n<\/ul>\n<p><code>subscriber.py<\/code> \u4ee3\u7801\u5982\u4e0b<\/p>\n<pre><code class=\"python\">import time\nfrom multiprocessing import Process\nfrom redis import Redis\n\nnb_subscribers = 3\n\ndef subscriber(user_id):\n    r = Redis(unix_socket_path='cache.sock')\n    try:\n        r.xgroup_create(name='tasks_queue', groupname='test', mkstream=True)\n    except Exception:\n        print('group already exists')\n\n    while True:\n        new_stream = r.xreadgroup(\n            groupname='test', consumername=f'testuser-{user_id}', streams={'tasks_queue': '&gt;'},\n            block=2000, count=1)\n        if not new_stream:\n            time.sleep(5)\n            continue\n        print(new_stream)\n\n\nprocesses = []\nfor i in range(nb_subscribers):\n    p = Process(target=subscriber, args=(i,))\n    p.start()\n    processes.append(p)\n\nwhile processes:\n    new_p = []\n    for p in processes:\n        if p.is_alive():\n            new_p.append(p)\n    processes = new_p\n    time.sleep(5)\n\nprint('all processes dead')<\/code><\/pre>\n<p><code>feeder.py<\/code> \u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"python\">import time\nimport uuid\n\nfrom multiprocessing import Process\n\nfrom redis import Redis\n\nnb_feeders = 1\n\ndef feeder():\n    r = Redis(unix_socket_path='cache.sock')\n    while True:\n        fields = {'task_uuid': str(uuid.uuid4())}\n        r.xadd(name='tasks_queue', fields=fields, id='*', maxlen=5000)\n        time.sleep(.1)\n\nprocesses = []\nfor _ in range(nb_feeders):\n    p = Process(target=feeder)\n    p.start()\n    processes.append(p)\n\nwhile processes:\n    new_p = []\n    for p in processes:\n        if p.is_alive():\n            new_p.append(p)\n    processes = new_p\n    time.sleep(5)\n\nprint('all processes dead')<\/code><\/pre>\n<p>\u6ce8\u610f\u8fd9\u91cc <code>unix_socket_path<\/code> \u8981\u6539\u4e3a\u81ea\u5df1 server \u914d\u7f6e\u7684 socket path\u3002\u6211\u4eec\u5148\u542f\u52a8\u53d1\u5e03\u8005 feeder.py \u5f80\u6d41\u91cc\u9762\u5199\u6570\u636e\uff0c\u518d\u7528 subscriber.py \u6765\u6d88\u8d39\u6d41\u3002\u9884\u671f\u7684\u6b63\u5e38\u8868\u73b0(Redis server v=7.0.8\u4e0a\u5c31\u662f\u8fd9\u4e2a\u8868\u73b0)\u662f subscriber \u4f1a\u6301\u7eed\u53d6\u51fa feeder \u5f80\u6d41\u91cc\u9762\u5199\u5165\u7684\u6570\u636e\uff0c\u540c\u65f6 redis \u8fd8\u80fd\u54cd\u5e94\u5176\u4ed6 client \u7684\u8bf7\u6c42\uff0cserver \u7684 CPU \u5360\u7528\u4e5f\u662f\u5728\u4e00\u4e2a\u5408\u7406\u7684\u6c34\u5e73\u4e0a\u3002<\/p>\n<p>\u4f46\u662f\u5728 7.2.0 \u7248\u672c(\u6e90\u7801\u662f 7.2.0-rc2\uff0c\u7f16\u8bd1\u597d\u7684 server \u7248\u672c\u662f v=7.1.241)\u4e0a\uff0c\u8fd9\u91cc\u5c31\u4e0d\u592a\u6b63\u5e38\u4e86\u3002\u6211\u4eec\u76f4\u63a5\u4ece <a href=\"https:\/\/link.segmentfault.com\/?enc=eIo2ph3yew1Xddxrshe%2BPA%3D%3D.bz%2FDAMDHdPFIQuwllTxtxJ9k%2FltGs68bjE83fYu2WCE56XV8zjUwd0dKo5ZOem12Bf%2FK%2BBJG2WhxtCpEiMDNig%3D%3D\" rel=\"nofollow\">Github Release 7.2-rc2<\/a> \u4e0b\u8f7d Reids 7.2 \u7684\u6e90\u7801\uff0c\u7136\u540e\u7f16\u8bd1\u4e8c\u8fdb\u5236\u3002\u8fd9\u91cc\u7f16\u8bd1\u6307\u4ee4\u5e26\u4e0a\u8fd9\u4e24\u4e2a Flag <code>make REDIS_CFLAGS=&quot;-Og -fno-omit-frame-pointer&quot;&quot;<\/code>\uff0c\u65b9\u4fbf\u540e\u7eed\u5206\u6790\u5de5\u5177\u80fd\u591f\u62ff\u5230\u5806\u6808\u4fe1\u606f\u3002\u590d\u73b0\u6b65\u9aa4\u5f88\u7b80\u5355\uff0c\u542f\u52a8 Redis server\uff0c\u63a5\u7740\u8fd0\u884c feeder.py \u548c subscriber.py \u8fd9\u4e24\u4e2a\u811a\u672c\u3002\u6211\u4eec\u4f1a\u770b\u5230\u8ba2\u9605\u8005\u5728\u5904\u7406\u90e8\u5206\u6d41\u4e4b\u540e\u4f1a\u963b\u585e\u4f4f\uff0c\u4e0d\u518d\u6709\u8f93\u51fa\u3002\u540c\u65f6 Redis \u8fdb\u7a0b\u7684 CPU \u76f4\u63a5\u98d9\u5230\u4e86100%\uff0c\u65b0\u7684 redis client \u4e5f\u8fde\u4e0d\u4e0a\u53bb\u670d\u52a1\u5668\u4e86\uff0c\u5982\u4e0b\u56fe\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc8E6b\" alt=\"cpu \u8dd1\u6162\uff0c\u540c\u65f6\u65b0\u7684 client \u4e5f\u8fde\u63a5\u5931\u8d25\" title=\"cpu \u8dd1\u6162\uff0c\u540c\u65f6\u65b0\u7684 client \u4e5f\u8fde\u63a5\u5931\u8d25\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc8E6c\" alt=\"subscriber \u4e00\u76f4\u88ab\u963b\u585e\" title=\"subscriber \u4e00\u76f4\u88ab\u963b\u585e\" loading=\"lazy\"><br \/>\u6740\u4e86\u4e24\u4e2a\u811a\u672c\u540e\uff0c\u95ee\u9898\u4f9d\u7136\u5b58\u5728\uff0c\u9664\u975e\u91cd\u542f server \u624d\u884c\u3002<\/p>\n<h2>ebpf \u5206\u6790<\/h2>\n<p>\u6211\u4eec\u5148\u4e0d\u53bb\u770b Issue \u4e0a\u5bf9\u4e8e\u95ee\u9898\u539f\u56e0\u7684\u5206\u6790\uff0c\u76f4\u63a5\u7528\u4e00\u822c\u65b9\u6cd5\u6765\u5206\u6790\u8fd9\u91cc CPU \u5360\u7528\u9ad8\u7684\u539f\u56e0\u3002\u5206\u6790 CPU \u9996\u9009 profile \u91c7\u6837\uff0c\u7136\u540e\u8f6c\u6210\u706b\u7130\u56fe\u6765\u770b\u3002\u8fd9\u91cc\u5f3a\u70c8\u63a8\u8350 brendangregg \u7684\u535a\u5ba2 <a href=\"https:\/\/link.segmentfault.com\/?enc=IoE7y2foQ8IISnpaifJ3eg%3D%3D.idh9w9TfWQ067I1qN3lspaBC61bMaFIKnDSUV49zobH%2Bj7vkJ%2BdpByGgDSpCi63jIiOiJUplgg2%2BClPaPRx7ng%3D%3D\" rel=\"nofollow\">CPU Flame Graphs<\/a>\uff0c\u4ecb\u7ecd\u4e86\u9488\u5bf9\u4e0d\u540c\u8bed\u8a00\u7684\u670d\u52a1\uff0c\u5982\u679c\u7528\u5de5\u5177\u6765\u5206\u6790 CPU \u5360\u7528\u3002\u5bf9\u4e8e Redis \u6765\u8bf4\uff0c\u5b98\u65b9\u4e5f\u7ed9\u51fa\u4e86\u6587\u6863\uff0c\u6211\u4eec\u8fd9\u91cc\u53c2\u8003\u5b98\u65b9\u7684 <a href=\"https:\/\/link.segmentfault.com\/?enc=QeSoFY5i5pQMH56UyUnefg%3D%3D.Ew4R8I640k%2FaLnfNlJ4eTT4xcGusuAlcAOtLrePxDG8kW91iAjSZbwd684iaxHOSsWgc3DDkr3bIZspK6L9vCQ%3D%3D\" rel=\"nofollow\">Redis CPU profiling<\/a>\uff0c\u7528 ebpf \u751f\u6210 CPU \u706b\u7130\u56fe\u3002<\/p>\n<p>\u5982\u4f55\u5b89\u88c5 bcc-tools \u53ef\u4ee5\u770b\u5b98\u65b9\u6587\u6863\uff0c\u8fd9\u91cc\u4e0d\u5c55\u5f00\u4e86\uff0c\u7136\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u7528 profile \u5de5\u5177\u6765\u505a cpu \u91c7\u6837\u3002<\/p>\n<pre><code class=\"shell\">$ profile -F 999 -f --pid $(pgrep redis-server)  60 &gt; redis.folded.stacks\n$ ..\/FlameGraph\/flamegraph.pl redis.folded.stacks &gt; redis.svg<\/code><\/pre>\n<p>profile \u662f BCC\uff08BPF Compiler Collection\uff09\u5de5\u5177\u96c6\u4e2d\u7684\u4e00\u4e2a\u5de5\u5177\uff0c\u7528\u4e8e\u91c7\u96c6 CPU \u7684\u5806\u6808\u8ddf\u8e2a\u4fe1\u606f\u3002\u8fd9\u4e2a\u547d\u4ee4\u7684\u53c2\u6570\u542b\u4e49\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>-F 999\uff0c\u8bbe\u7f6e\u91c7\u6837\u9891\u7387\u4e3a 999 Hz\uff0c\u5373\u6bcf\u79d2\u91c7\u6837 999 \u6b21\uff0c\u91c7\u6837\u9891\u7387\u9009\u62e9\u5947\u6570 999 \u662f\u4e3a\u4e86\u907f\u514d\u4e0e\u5176\u4ed6\u6d3b\u52a8\u4ea7\u751f\u540c\u6b65\uff0c\u4ece\u800c\u53ef\u80fd\u5bfc\u81f4\u8bef\u5bfc\u6027\u7684\u7ed3\u679c\u3002\u5982\u679c\u91c7\u6837\u9891\u7387\u4e0e\u7cfb\u7edf\u4e2d\u7684\u67d0\u4e9b\u5468\u671f\u6027\u6d3b\u52a8\uff08\u5982\u5b9a\u65f6\u5668\u4e2d\u65ad\u3001\u4e0a\u4e0b\u6587\u5207\u6362\u7b49\uff0c\u4e00\u822c\u90fd\u662f\u5076\u6570\u5468\u671f\uff0c\u6bd4\u5982 100Hz\uff09\u540c\u6b65\uff0c\u90a3\u4e48\u91c7\u6837\u7ed3\u679c\u53ef\u80fd\u4f1a\u504f\u5411\u4e8e\u8fd9\u4e9b\u6d3b\u52a8\uff0c\u4ece\u800c\u5bfc\u81f4\u5206\u6790\u7ed3\u679c\u7684\u504f\u5dee\u3002<\/li>\n<li>-f \u6298\u53e0\u5806\u6808\u8ddf\u8e2a\u4fe1\u606f\uff0c\u4f7f\u5176\u66f4\u9002\u5408\u751f\u6210 Flame Graphs\u3002<\/li>\n<li>&#8211;pid $(pgrep redis-server)\uff0c\u6307\u5b9a\u8981\u91c7\u96c6\u7684\u8fdb\u7a0b ID\uff0c\u8fd9\u91cc\u4f7f\u7528 pgrep redis-server \u6765\u83b7\u53d6 redis-server \u8fdb\u7a0b\u7684 PID\u3002<\/li>\n<li>60\uff0c\u91c7\u96c6\u7684\u6301\u7eed\u65f6\u95f4\uff0c\u5355\u4f4d\u4e3a\u79d2\uff0credis \u5b98\u65b9\u6587\u6863\u7ed9\u7684 profile \u547d\u4ee4\u53ef\u80fd\u4e0d\u9002\u7528\u67d0\u4e9b\u7248\u672c\u3002<\/li>\n<\/ul>\n<p>\u63a5\u7740\u4f7f\u7528\u4e86 <a href=\"https:\/\/link.segmentfault.com\/?enc=tYALI9Ctc1arqGijolmPdA%3D%3D.paBwwfK7z1Rjdlqz%2FOVFkXNCZ8cx5CwgikBrjqaluXDBs25o9%2BxfTeY4KOhQlLCuOX%2BWLn1mZZIVdEohxSpCpJhSA7nTTVcVqLTC7gexBIQ%3D\" rel=\"nofollow\">flamegraph.pl<\/a> \u811a\u672c\uff0c\u5b83\u662f <a href=\"https:\/\/link.segmentfault.com\/?enc=383yNrBNNq34kXm6ZkXeQw%3D%3D.wgf1Ot554yUAKQLdQsbTKhr3ctxZEr8qGGl8tet1EgfKtQXKJvAb760Fo7Hy4Vhb\" rel=\"nofollow\">FlameGraph<\/a> \u5de5\u5177\u96c6\u4e2d\u7684\u4e00\u4e2a\u811a\u672c\uff0c\u7528\u4e8e\u5c06\u5806\u6808\u8ddf\u8e2a\u4fe1\u606f\u8f6c\u6362\u4e3a SVG \u683c\u5f0f\u7684 Flame Graphs\u3002\u6700\u7ec8\u751f\u6210\u7684 CPU \u706b\u7130\u56fe\u5982\u4e0b\uff0c\u8fd9\u91cc\u624b\u52a8\u8fc7\u6ee4\u4e86\u6781\u5c11\u90e8\u5206 unknow \u7684\u8c03\u7528\u5806\u6808\uff08\u4e0d\u7136\u56fe\u7247\u770b\u8d77\u6765\u592a\u957f\u4e86\uff0c\u6709\u70b9\u5f71\u54cd\u9605\u8bfb\uff09\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc8E6C\" alt=\"CPU \u706b\u7130\u56fe\" title=\"CPU \u706b\u7130\u56fe\" loading=\"lazy\"><\/p>\n<p>\u901a\u8fc7\u706b\u7130\u56fe\uff0c\u6211\u4eec\u627e\u5230\u4e86 CPU \u8dd1\u6ee1\u7684\u6267\u884c\u5806\u6808\uff0c\u4e0b\u4e00\u7bc7\u6587\u7ae0\uff0c\u6211\u4eec\u7ee7\u7eed\u5206\u6790\u4e3a\u5565\u4e00\u76f4\u5728\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801\u4e86\u3002<\/p>\n<blockquote><p>\u672c\u6587\u7531selfboot \u53d1\u8868\u4e8e\u4e2a\u4eba\u535a\u5ba2\uff0c\u91c7\u7528\u7f72\u540d-\u975e\u5546\u4e1a\u6027\u4f7f\u7528-\u76f8\u540c\u65b9\u5f0f\u5171\u4eab 3.0 \u4e2d\u56fd\u5927\u9646\u8bb8\u53ef\u534f\u8bae\u3002<br \/>\u975e\u5546\u4e1a\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u4f5c\u8005\u53ca\u51fa\u5904\u3002\u5546\u4e1a\u8f6c\u8f7d\u8bf7\u8054\u7cfb\u4f5c\u8005\u672c\u4eba<br \/>\u672c\u6587\u6807\u9898\u4e3a\uff1aRedis Issue \u5206\u6790\uff1a\u6d41\u6570\u636e\u8bfb\u5199\u5bfc\u81f4\u7684\u201c\u6b7b\u9501\u201d\u95ee\u9898(1)<br \/>\u672c\u6587\u94fe\u63a5\u4e3a\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=0Rrnu%2BSUY7xJTlm0FIsC0Q%3D%3D.g3EeZXKZZm%2FezSHVHvZWkrjPlkMe%2BqnE5U%2BxRrcvf%2FIsr6aFCahkxTwiX%2FE3bEOiTqo6JpyDBybq9tBsCGZcmw%3D%3D\" rel=\"nofollow\">https:\/\/selfboot.cn\/2023\/06\/14\/bug_redis_deadlock_1\/<\/a><\/p><\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000043971279\">https:\/\/segmentfault.com\/a\/1190000043971279<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Redis \u9879\u76ee\u4e2d\uff0c\u4e00\u4e2a\u540d\u4e3a &#8220;[BUG] Deadlock with streams on re [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008035","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008035","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008035"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008035\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008035"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008035"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}