Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var maxLength = 1000;
    var logEntries = 10000;
    
    var pslog = [];
    function pushShiftLog(message) {
      if (pslog.length >= maxLength) {
        pslog.shift();
      }
      pslog.push(message);
    }
    
    var dblog = 1;
    var dblog1 = [];
    var dblog2 = [];
    function doubleBufferLog(message) {
      if (dblog === 1 && dblog1.length >= maxLength) {
        dblog2 = [];
        dblog = 2;
      }
    
      if (dblog === 2 && dblog2.length >= maxLength) {
        dblog1 = [];
        dblog = 1;
      }
      
      if (dblog === 1) {
        dblog1.push(message);
      } else if (dblog === 2) {
        dblog2.push(message);
      }
    }
  };
</script>

Test runner

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for (var I = 0; I < logEntries; I ++) {
pushShiftLog("message");
}

for (var I = 0; I < logEntries; I ++) {
doubleBufferLog("message");
}

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