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http: use direct parameters instead #10833

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JacksonTian
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@JacksonTian JacksonTian commented Jan 16, 2017

When parameter count is fixed, use literal Array instance is more
simply and avoid arguments leak also.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

http

@nodejs-github-bot nodejs-github-bot added the http Issues or PRs related to the http subsystem. label Jan 16, 2017
};

ClientRequest.prototype.setSocketKeepAlive = _setSocketKeepAlive;
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@mscdex mscdex Jan 16, 2017

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I think the underscore should be removed here, so that the function name matches the prototype property name, just like with setNoDelay() above.

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mscdex commented Jan 16, 2017

Nit: saying the arguments were being leaked is a bit misleading, it makes it sound as if the arguments object was being passed to something other than a .apply(). I think it would be more accurate to say something like 'avoid copying arguments with a loop.'

caculate([noDelay]);
}

var common = require('../common.js');
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@mscdex mscdex Jan 16, 2017

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This should go at the top of the file, after 'use strict';. I would probably also put the var bench = ... after this var common = ... line at the top as well.

@simonkcleung
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simonkcleung commented Jan 16, 2017

Basically, it doesnt work.

'use strict';

var o={x:0};

function caculate(args) {
  o.x=args[0]+args[1] + 1;
}

function setNoDelay() {
  const argsLen = arguments.length;
  const args = new Array(argsLen);
  for (var i = 0; i < argsLen; i++)
    args[i] = arguments[i];
  caculate(args);
}

function setNoDelay2(noDelay) {
  caculate([noDelay]);
}

var common = require('../common.js');

var bench = common.createBenchmark(main, {
  n: [1000000],
  name: ['setNoDelay', 'setNoDelay2']
}, {});

function main(conf) {
  var n = conf.n;
  var method = conf.name === 'setNoDelay' ? setNoDelay : setNoDelay2;
  var i;

  bench.start();

  for (i = 0; i < n; i++) {
    method(1,2);
  }
  console.log(o.x);
  bench.end(n);
}

Difference!

@JacksonTian
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@simonkcleung the benchmark test case is for copy arguments item vs literal Array instance. When parameters count is 2, should change the setNoDelay and setNoDelay2 too.

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simonkcleung commented Jan 17, 2017

@JacksonTian Right! I think I overlooked something.
In the API, request.setNoDelay([noDelay]), there is only 1 or 0 parameter. It is no need to use the for looping.

@JacksonTian
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I updated the commits by review suggestion. Would like to review it again? @mscdex

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mscdex commented Jan 19, 2017

I'm not sure the benchmark is worth including really. I don't think there will ever be a case when the loop will ever be faster than the explicit array literal case.

@JacksonTian
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@mscdex Let me remove the benchmark.

When parameter count is fixed, use literal Array instance is more
simply and avoid arguments leak also.
@mscdex
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mscdex commented Jan 20, 2017

LGTM if CI is ok with it: https://ci.nodejs.org/job/node-test-pull-request/5960/

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Landed aa8eb87

italoacasas pushed a commit that referenced this pull request Jan 31, 2017
When parameter count is fixed, use literal Array instance is more
simply and avoid arguments leak also.

PR-URL: #10833
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Brian White <[email protected]>
evanlucas pushed a commit that referenced this pull request Jan 31, 2017
When parameter count is fixed, use literal Array instance is more
simply and avoid arguments leak also.

PR-URL: #10833
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Brian White <[email protected]>
@jasnell
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jasnell commented Mar 7, 2017

Would require a backport PR if it should land on v6 or v4

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7 participants