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os: improve networkInterfaces() performance #25410

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@mscdex mscdex commented Jan 9, 2019

With included benchmark:

                                  confidence improvement accuracy (*)   (**)  (***)
 os/networkInterfaces.js n=10000        ***      3.86 %       ±0.26% ±0.34% ±0.44%

and also makes the C++ implementation mirror the C++ cpu enumeration code for whatever that's worth.

CI: https://ci.nodejs.org/job/node-test-pull-request/20031/

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  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

@mscdex mscdex added os Issues and PRs related to the os subsystem. performance Issues and PRs related to the performance of Node.js. labels Jan 9, 2019
@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Jan 9, 2019
if (existing !== undefined)
existing.push(entry);
else
result[name] = [entry];
}
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@jdalton jdalton Jan 9, 2019

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Can you explain the perf benefit for networkInterfaces()?

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What do you mean?

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@jdalton jdalton Jan 9, 2019

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At first glance it looks like a lot of unrolled code with an extra object being created. Could you please step me through the optimization being done in networkInterfaces(). If you drop the rework to networkInterfaces() do you still see perf wins?

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@mscdex mscdex Jan 9, 2019

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It's more or less moving the object creation from C++ to JS land, just like we do for CPU enumeration.

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I personally wonder if it would not be faster to just move everything to C++ instead.

The changes LGTM besides the result object. It should be kept as regular object.

lib/os.js Outdated Show resolved Hide resolved
@mscdex mscdex force-pushed the os-networkinterfaces-refactor branch from d7b7cde to b505976 Compare January 9, 2019 19:33
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@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Jan 10, 2019
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danbev commented Jan 14, 2019

Landed in 5021b25.

@danbev danbev closed this Jan 14, 2019
danbev pushed a commit that referenced this pull request Jan 14, 2019
PR-URL: #25410
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
@mscdex mscdex deleted the os-networkinterfaces-refactor branch January 14, 2019 07:14
addaleax pushed a commit that referenced this pull request Jan 14, 2019
PR-URL: #25410
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
@BridgeAR BridgeAR mentioned this pull request Jan 16, 2019
BridgeAR pushed a commit to BridgeAR/node that referenced this pull request Jan 16, 2019
PR-URL: nodejs#25410
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
@MylesBorins MylesBorins mentioned this pull request Jan 24, 2019
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6 participants