Status: New
Owner: ----
New issue 2131 by [email protected]: Array.splice() slows down at
arrays larger than 114467
http://code.google.com/p/v8/issues/detail?id=2131
I'm getting an astronomical difference in speeds for running splice(0,1)
for arrays of lengths 114467 and 114468 respectively.
Running this benchmark:
var t;
function startBench(){t=new Date().getTime();}
function stopBench(){console.log(new Date().getTime()-t);}
var arr=[];
for (var i = 114467; i > 0; i--) {
arr.push([i - 1, i]);
}
var arr2=[];
for (var i = 114468; i > 0; i--) {
arr2.push([i - 1, i]);
}
startBench();
for(i=0;i<1000;i++){
arr.splice(0,1);
}
stopBench();
startBench();
for(i=0;i<1000;i++){
arr2.splice(0,1);
}
stopBench();
I get 3ms for the array of length 114467 and 2750ms for the array of length
114468.
Firefox gives 170ms for both, but that's irrelevant.
Is this a bug?
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