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  1. Core Server
  2. SERVER-9580

Multiple tailable cursors against the same collection shows high cpu usage on server

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    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 2.4.3
    • Component/s: Performance
    • None
    • ALL
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      install node.js
      npm install -g mubsub

      Code
      ---------------------------------------
      var mubsub = require('mubsub');

      var client = mubsub('mongodb://localhost:27017/test?poolSize=5',

      {safe: true}

      );
      var channel = client.channel('mubsub');

      channel.subscribe(console.log);
      channel.subscribe(console.log);
      channel.subscribe(console.log);
      channel.subscribe(console.log);
      channel.subscribe(console.log);
      channel.subscribe(console.log);
      channel.subscribe(console.log);
      channel.subscribe(console.log);
      channel.subscribe(console.log);

      Show
      install node.js npm install -g mubsub Code --------------------------------------- var mubsub = require('mubsub'); var client = mubsub('mongodb://localhost:27017/test?poolSize=5', {safe: true} ); var channel = client.channel('mubsub'); channel.subscribe(console.log); channel.subscribe(console.log); channel.subscribe(console.log); channel.subscribe(console.log); channel.subscribe(console.log); channel.subscribe(console.log); channel.subscribe(console.log); channel.subscribe(console.log); channel.subscribe(console.log);
    • 0

      Open multiple tailable cursors with or without awaitdata against a capped collection causes sustained high cpu (on my machine about 30% cpu). A single cursor is about 5% cpu.

      Confirmed using the node.js driver and java driver.

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              Created:
              Updated:
              Resolved: