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bajtos/1-source benchmark-fs-promised-stat.js

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Benchmark of fs.stat with promises
Raw
1-source benchmark-fs-promised-stat.js
// Call fs.stat over and over again really fast.
// Then see how many times it got called.
// Yes, this is a silly benchmark. Most benchmarks are silly.
var path = require('path');
var common = require('../common.js');
var fs = require('fs');
var FILES = [
require.resolve('../../lib/assert.js'),
require.resolve('../../lib/console.js'),
require.resolve('../../lib/fs.js')
];
var VARIANTS = {
promisedAndPromise: createPromiseBasedTest(statViaPromise),
promisedAndCallback: createCallBackBasedTest(statViaPromise),
callbackAndPromise: createPromiseBasedTest(statViaCallback),
callbackAndCallback: createCallBackBasedTest(statViaCallback),
nativeAndCallback: createCallBackBasedTest(fs.stat)
};
var bench = common.createBenchmark(main, {
dur: [5],
concurrent: [1, 10, 100],
promise: ['native', 'bluebird'],
variant: Object.keys(VARIANTS)
});
function main(conf) {
var stat = VARIANTS[conf.variant];
if (conf.promise === 'bluebird') Promise = require('bluebird');
var calls = 0;
bench.start();
setTimeout(function() {
bench.end(calls);
}, +conf.dur * 1000);
var cur = +conf.concurrent;
while (cur--) run();
function run() {
var p = stat(next);
if (p) p.then(next);
}
function next() {
calls++;
run();
}
}
function createCallBackBasedTest(stat) {
return function runStatViaCallbacks(cb) {
stat(FILES[0], function(err, data) {
if (err) throw err;
second();
});
function second() {
stat(FILES[1], function(err, data) {
if (err) throw err;
third();
});
}
function third() {
stat(FILES[2], function(err, data) {
if (err) throw err;
cb();
});
}
};
}
function createPromiseBasedTest(stat) {
return function runStatViaPromises() {
return stat(FILES[0])
.then(function secondP(data) {
return stat(FILES[1]);
})
.then(function thirdP(data) {
return stat(FILES[2]);
});
}
}
/*---- CODE PASTED FROM lib/fs.js ----*/
var util = require('util');
var pathModule = require('path');
var binding = process.binding('fs');
var FSReqWrap = binding.FSReqWrap;
function statViaCallback(path, callback) {
if (!callback) {
return new Promise(function(resolve, reject) {
statViaCallback(path, function(err, data) {
if (err) reject(err);
else resolve(data);
});
});
}
callback = makeCallback(callback);
if (!nullCheck(path, callback)) return;
var req = new FSReqWrap();
req.oncomplete = callback;
binding.stat(pathModule._makeLong(path), req);
};
// Ensure that callbacks run in the global context. Only use this function
// for callbacks that are passed to the binding layer, callbacks that are
// invoked from JS already run in the proper scope.
function makeCallback(cb) {
if (!util.isFunction(cb)) {
return rethrow();
}
return function() {
return cb.apply(null, arguments);
};
}
function nullCheck(path, callback) {
if (('' + path).indexOf('\u0000') !== -1) {
var er = new Error('Path must be a string without null bytes.');
if (!callback)
throw er;
process.nextTick(function() {
callback(er);
});
return false;
}
return true;
}
/*---- PROMISIFIED IMPLEMENTATION BASED ON lib/fs.js ----*/
function statViaPromise(path, callback) {
if (callback) callback = makeCallback(callback);
var promise = new Promise(function StatPromise(resolve, reject) {
if (rejectIfNull(path, reject)) return;
var req = new FSReqWrap();
req.oncomplete = function resolveStatCompletion(err, result) {
resolve(result);
};
binding.stat(pathModule._makeLong(path), req);
});
if (!callback) return promise;
promise
.then(function(result) { callback(null, result); })
.catch(function(err) { callback(err); });
// return undefined
}
function rejectIfNull(path, reject) {
if (('' + path).indexOf('\u0000') !== -1) {
var er = new Error('Path must be a string without null bytes.');
reject(err);
return true;
}
return false;
}
Raw
2-results
Machine: rMBP; 2.7 GHz Intel Core i7; 16 GB 1600 MHz DDR3
io.js version: v0.11.15-pre (99e7c58)
V8 version: 3.30.37
fs/promised-stat.js dur=5 concurrent=10 promise=native variant=promisedAndPromise: 15969
fs/promised-stat.js dur=5 concurrent=10 promise=native variant=promisedAndCallback: 13414
fs/promised-stat.js dur=5 concurrent=10 promise=native variant=callbackAndPromise: 17753
fs/promised-stat.js dur=5 concurrent=10 promise=native variant=callbackAndCallback: 38572
fs/promised-stat.js dur=5 concurrent=10 promise=native variant=nativeAndCallback: 39432
Using Bluebird instead of native promises:
fs/promised-stat.js dur=5 concurrent=10 promise=bluebird variant=promisedAndPromise: 24612
fs/promised-stat.js dur=5 concurrent=10 promise=bluebird variant=promisedAndCallback: 22240
fs/promised-stat.js dur=5 concurrent=10 promise=bluebird variant=callbackAndPromise: 29612
fs/promised-stat.js dur=5 concurrent=10 promise=bluebird variant=callbackAndCallback: 40402
fs/promised-stat.js dur=5 concurrent=10 promise=bluebird variant=nativeAndCallback: 39807
Raw
3-profiler log for promisedAndPromise
Statistical profiling result from isolate-0x102000000-v8.log, (17944 ticks, 143 unaccounted, 0 excluded).
[Unknown]:
ticks total nonlib name
143 0.8%
[Shared libraries]:
ticks total nonlib name
12635 70.4% 0.0% /Users/bajtos/src/io.js/out/Release/node
528 2.9% 0.0% /usr/lib/system/libsystem_malloc.dylib
474 2.6% 0.0% /usr/lib/system/libsystem_platform.dylib
292 1.6% 0.0% /usr/lib/system/libsystem_kernel.dylib
56 0.3% 0.0% /usr/lib/system/libsystem_m.dylib
40 0.2% 0.0% /usr/lib/system/libsystem_pthread.dylib
21 0.1% 0.0% /usr/lib/libc++abi.dylib
9 0.1% 0.0% /usr/lib/system/libsystem_c.dylib
1 0.0% 0.0% /usr/lib/libstdc++.6.dylib
[JavaScript]:
ticks total nonlib name
268 1.5% 6.9% Builtin: A builtin from the snapshot
240 1.3% 6.2% LazyCompile: PromiseHandle native promise.js:76:23
217 1.2% 5.6% Stub: CEntryStub
142 0.8% 3.7% Stub: CallConstructStub
136 0.8% 3.5% LazyCompile: ~StatPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:145:49
132 0.7% 3.4% LazyCompile: *fs.Stats fs.js:120:20
131 0.7% 3.4% LazyCompile: Promise native promise.js:20:23
130 0.7% 3.3% LazyCompile: ~<anonymous> native promise.js:209:9
106 0.6% 2.7% KeyedLoadIC: A keyed load IC from the snapshot
104 0.6% 2.7% Builtin: A builtin from the snapshot {1}
102 0.6% 2.6% LazyCompile: *Date native date.js:62:25
92 0.5% 2.4% LazyCompile: ~<anonymous> native promise.js:94:27
86 0.5% 2.2% LazyCompile: PromiseCoerce native promise.js:56:23
83 0.5% 2.1% LazyCompile: ~chain native promise.js:166:35
73 0.4% 1.9% Stub: FastNewClosureStub {1}
71 0.4% 1.8% LazyCompile: *statViaPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:142:24
66 0.4% 1.7% LazyCompile: *PromiseSet native promise.js:36:20
62 0.3% 1.6% Stub: CompareICStub {1}
59 0.3% 1.5% Stub: CallConstructStub {1}
54 0.3% 1.4% Stub: FastNewContextStub
54 0.3% 1.4% Stub: FastNewClosureStub
54 0.3% 1.4% Builtin: A builtin from the snapshot {4}
53 0.3% 1.4% LazyCompile: *next /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:48:16
52 0.3% 1.3% Stub: CompareICStub
51 0.3% 1.3% Stub: JSEntryStub {1}
50 0.3% 1.3% LazyCompile: ConfigureTemplateInstance native apinatives.js:63:35
49 0.3% 1.3% Stub: JSEntryStub
43 0.2% 1.1% Builtin: A builtin from the snapshot {2}
42 0.2% 1.1% LazyCompile: *rejectIfNull /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:162:22
42 0.2% 1.1% KeyedLoadIC: {97}
41 0.2% 1.1% Stub: StoreTransitionStub
41 0.2% 1.1% LazyCompile: ~resolveStatCompletion /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:148:52
40 0.2% 1.0% LazyCompile: *IsPromise native promise.js:114:29
35 0.2% 0.9% LazyCompile: ~<anonymous> native promise.js:28:11
34 0.2% 0.9% Stub: InternalArrayNoArgumentConstructorStub
31 0.2% 0.8% Stub: promiseRaw
31 0.2% 0.8% KeyedStoreIC: A keyed store IC from the snapshot
31 0.2% 0.8% Builtin: A builtin from the snapshot {3}
29 0.2% 0.7% Stub: symbol(hash 1fa6f443)
28 0.2% 0.7% Stub: push
27 0.2% 0.7% LazyCompile: ~resolve native promise.js:137:17
27 0.2% 0.7% LazyCompile: *PromiseDone native promise.js:50:21
27 0.2% 0.7% Handler: An IC handler from the snapshot {2}
26 0.1% 0.7% LazyCompile: *defer native promise.js:132:25
25 0.1% 0.6% Stub: ToBooleanStub(Undefined,SpecObject)
25 0.1% 0.6% Stub: LoadConstantStub {1}
25 0.1% 0.6% Stub: FastNewContextStub {1}
25 0.1% 0.6% Stub: CallICStub(args(2), METHOD,
25 0.1% 0.6% LazyCompile: *PromiseInit native promise.js:46:21
23 0.1% 0.6% LazyCompile: ~thirdP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:83:28
22 0.1% 0.6% LazyCompile: *posix._makeLong path.js:530:27
21 0.1% 0.5% Stub: ToBooleanStub
20 0.1% 0.5% Stub: oncomplete {1}
20 0.1% 0.5% LazyCompile: *then native promise.js:200:33
19 0.1% 0.5% Stub: LoadConstantStub
17 0.1% 0.4% LazyCompile: *PromiseEnqueue native promise.js:92:24
16 0.1% 0.4% Stub: constructor {NaN}
15 0.1% 0.4% Stub: InternalArrayConstructorStub
14 0.1% 0.4% Stub: IsPromise {1}
14 0.1% 0.4% Stub: CompareICStub {3}
13 0.1% 0.3% Stub: LoadFastElementStub
13 0.1% 0.3% Stub: CompareICStub {7}
13 0.1% 0.3% Stub: CompareICStub {6}
13 0.1% 0.3% LazyCompile: *indexOf native string.js:54:25
13 0.1% 0.3% LazyCompile: *PromiseResolve native promise.js:120:39
13 0.1% 0.3% Handler: An IC handler from the snapshot {1}
12 0.1% 0.3% KeyedLoadIC: {99}
12 0.1% 0.3% Handler: An IC handler from the snapshot {3}
11 0.1% 0.3% Handler: An IC handler from the snapshot
10 0.1% 0.3% Stub: LoadFastElementStub {1}
10 0.1% 0.3% LazyCompile: ~secondP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:80:29
9 0.1% 0.2% Stub: FastNewContextStub {3}
9 0.1% 0.2% Stub: CompareICStub {8}
8 0.0% 0.2% Stub: LoadConstantStub {2}
7 0.0% 0.2% Stub: PromiseChain
7 0.0% 0.2% Stub: CompareICStub {5}
7 0.0% 0.2% KeyedLoadIC: symbol("Promise#status" hash 16f76b3f)
6 0.0% 0.2% Stub: promiseOnResolve
6 0.0% 0.2% Stub: promiseHasHandler
6 0.0% 0.2% Stub: FastNewContextStub {2}
6 0.0% 0.2% Stub: CompareICStub {4}
4 0.0% 0.1% Stub: PromiseResolve
3 0.0% 0.1% Stub: promiseStatus
3 0.0% 0.1% Stub: RecordWriteStub {3}
3 0.0% 0.1% LazyCompile: ~indexOf native string.js:54:25
3 0.0% 0.1% KeyedLoadIC: symbol("Promise#onReject" hash 392de1fd)
3 0.0% 0.1% Builtin: A builtin from the snapshot {7}
3 0.0% 0.1% Builtin: A builtin from the snapshot {5}
2 0.0% 0.1% Stub: promiseOnReject
2 0.0% 0.1% Stub: RecordWriteStub {1}
2 0.0% 0.1% KeyedLoadIC: symbol("Promise#onResolve" hash e03bee5)
2 0.0% 0.1% Handler: An IC handler from the snapshot {5}
2 0.0% 0.1% Builtin: A builtin from the snapshot {8}
1 0.0% 0.0% Stub: compile
1 0.0% 0.0% Stub: RecordWriteStub {4}
1 0.0% 0.0% Stub: RecordWriteStub {2}
1 0.0% 0.0% Stub: RecordWriteStub
1 0.0% 0.0% Stub: CompareICStub {2}
1 0.0% 0.0% LazyCompile: ~PromiseDone native promise.js:50:21
1 0.0% 0.0% LazyCompile: ~Date native date.js:62:25
[C++]:
ticks total nonlib name
[GC]:
ticks total nonlib name
1457 8.1%
[Bottom up (heavy) profile]:
Note: percentage shows a share of a particular caller in the total
amount of its parent calls.
Callers occupying less than 2.0% are not shown.
ticks parent name
12635 70.4% /Users/bajtos/src/io.js/out/Release/node
8984 71.1% /Users/bajtos/src/io.js/out/Release/node
3162 35.2% LazyCompile: *PromiseSet native promise.js:36:20
2145 67.8% LazyCompile: *PromiseInit native promise.js:46:21
1268 59.1% LazyCompile: Promise native promise.js:20:23
1268 100.0% LazyCompile: *statViaPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:142:24
877 40.9% LazyCompile: *defer native promise.js:132:25
877 100.0% LazyCompile: ~chain native promise.js:166:35
1013 32.0% LazyCompile: *PromiseDone native promise.js:50:21
1013 100.0% LazyCompile: *PromiseResolve native promise.js:120:39
541 53.4% LazyCompile: ~resolve native promise.js:137:17
472 46.6% LazyCompile: ~<anonymous> native promise.js:28:11
3055 34.0% LazyCompile: ~StatPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:145:49
3055 100.0% LazyCompile: Promise native promise.js:20:23
3054 100.0% LazyCompile: *statViaPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:142:24
1486 48.7% LazyCompile: ~secondP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:80:29
786 25.7% LazyCompile: *next /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:48:16
782 25.6% LazyCompile: ~thirdP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:83:28
631 7.0% LazyCompile: *IsPromise native promise.js:114:29
462 73.2% LazyCompile: PromiseCoerce native promise.js:56:23
462 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
462 100.0% LazyCompile: PromiseHandle native promise.js:76:23
168 26.6% LazyCompile: ~<anonymous> native promise.js:209:9
168 100.0% LazyCompile: PromiseHandle native promise.js:76:23
168 100.0% LazyCompile: ~<anonymous> native promise.js:94:27
522 5.8% LazyCompile: ~chain native promise.js:166:35
310 59.4% LazyCompile: *then native promise.js:200:33
310 100.0% LazyCompile: *next /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:48:16
310 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
212 40.6% LazyCompile: PromiseHandle native promise.js:76:23
212 100.0% LazyCompile: ~<anonymous> native promise.js:94:27
472 5.3% LazyCompile: *PromiseEnqueue native promise.js:92:24
468 99.2% LazyCompile: *PromiseDone native promise.js:50:21
468 100.0% LazyCompile: *PromiseResolve native promise.js:120:39
246 52.6% LazyCompile: ~resolve native promise.js:137:17
222 47.4% LazyCompile: ~<anonymous> native promise.js:28:11
341 3.8% LazyCompile: *Date native date.js:62:25
341 100.0% LazyCompile: *fs.Stats fs.js:120:20
269 3.0% LazyCompile: *indexOf native string.js:54:25
269 100.0% LazyCompile: *rejectIfNull /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:162:22
269 100.0% LazyCompile: ~StatPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:145:49
269 100.0% LazyCompile: Promise native promise.js:20:23
203 2.3% LazyCompile: PromiseHandle native promise.js:76:23
203 100.0% LazyCompile: ~<anonymous> native promise.js:94:27
528 2.9% /usr/lib/system/libsystem_malloc.dylib
463 87.7% /Users/bajtos/src/io.js/out/Release/node
306 66.1% LazyCompile: PromiseHandle native promise.js:76:23
306 100.0% LazyCompile: ~<anonymous> native promise.js:94:27
144 31.1% LazyCompile: Promise native promise.js:20:23
143 99.3% LazyCompile: *statViaPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:142:24
50 35.0% LazyCompile: *next /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:48:16
50 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
47 32.9% LazyCompile: ~thirdP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:83:28
47 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
46 32.2% LazyCompile: ~secondP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:80:29
46 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
474 2.6% /usr/lib/system/libsystem_platform.dylib
349 73.6% /Users/bajtos/src/io.js/out/Release/node
126 36.1% LazyCompile: *PromiseSet native promise.js:36:20
110 87.3% LazyCompile: *PromiseInit native promise.js:46:21
66 60.0% LazyCompile: Promise native promise.js:20:23
66 100.0% LazyCompile: *statViaPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:142:24
44 40.0% LazyCompile: *defer native promise.js:132:25
44 100.0% LazyCompile: ~chain native promise.js:166:35
16 12.7% LazyCompile: *PromiseDone native promise.js:50:21
16 100.0% LazyCompile: *PromiseResolve native promise.js:120:39
13 81.3% LazyCompile: ~<anonymous> native promise.js:28:11
3 18.8% LazyCompile: ~resolve native promise.js:137:17
80 22.9% LazyCompile: PromiseHandle native promise.js:76:23
80 100.0% LazyCompile: ~<anonymous> native promise.js:94:27
43 12.3% LazyCompile: ~chain native promise.js:166:35
24 55.8% LazyCompile: PromiseHandle native promise.js:76:23
24 100.0% LazyCompile: ~<anonymous> native promise.js:94:27
19 44.2% LazyCompile: *then native promise.js:200:33
19 100.0% LazyCompile: *next /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:48:16
19 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
33 9.5% LazyCompile: ~StatPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:145:49
33 100.0% LazyCompile: Promise native promise.js:20:23
33 100.0% LazyCompile: *statViaPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:142:24
15 45.5% LazyCompile: ~secondP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:80:29
9 27.3% LazyCompile: ~thirdP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:83:28
9 27.3% LazyCompile: *next /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:48:16
21 6.0% LazyCompile: *PromiseEnqueue native promise.js:92:24
20 95.2% LazyCompile: *PromiseDone native promise.js:50:21
20 100.0% LazyCompile: *PromiseResolve native promise.js:120:39
16 80.0% LazyCompile: ~<anonymous> native promise.js:28:11
4 20.0% LazyCompile: ~resolve native promise.js:137:17
1 4.8% LazyCompile: ~PromiseDone native promise.js:50:21
1 100.0% LazyCompile: *PromiseResolve native promise.js:120:39
1 100.0% LazyCompile: ~<anonymous> native promise.js:28:11
20 5.7% LazyCompile: Promise native promise.js:20:23
20 100.0% LazyCompile: *statViaPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:142:24
9 45.0% LazyCompile: ~thirdP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:83:28
9 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
6 30.0% LazyCompile: *next /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:48:16
6 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
5 25.0% LazyCompile: ~secondP /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:80:29
5 100.0% LazyCompile: ~<anonymous> native promise.js:209:9
12 3.4% LazyCompile: *Date native date.js:62:25
12 100.0% LazyCompile: *fs.Stats fs.js:120:20
[Top down (heavy) profile]:
Note: callees occupying less than 0.1% are not shown.
inclusive self name
ticks total ticks total
11712 65.3% 92 0.5% LazyCompile: ~<anonymous> native promise.js:94:27
11553 64.4% 227 1.3% LazyCompile: PromiseHandle native promise.js:76:23
8664 48.3% 128 0.7% LazyCompile: ~<anonymous> native promise.js:209:9
2980 16.6% 53 0.3% LazyCompile: *next /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:48:16
1725 9.6% 26 0.1% LazyCompile: *statViaPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:142:24
1639 9.1% 49 0.3% LazyCompile: Promise native promise.js:20:23
979 5.5% 26 0.1% LazyCompile: ~StatPromise /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:145:49
797 4.4% 0 0.0% /Users/bajtos/src/io.js/out/Release/node
786 4.4% 786 4.4% /Users/bajtos/src/io.js/out/Release/node
74 0.4% 9 0.1% LazyCompile: *rejectIfNull /Users/bajtos/src/io.js/benchmark/fs/promised-stat.js:162:22
62 0.3% 3 0.0% LazyCompile: *indexOf native string.js:54:25
57 0.3% 0 0.0% /Users/bajtos/src/io.js/out/Release/node
57 0.3% 57 0.3% /Users/bajtos/src/io.js/out/Release/node
30 0.2% 14 0.1% LazyCompile: ConfigureTemplateInstance native apinatives.js:63:35
475 2.6% 5 0.0% LazyCompile: *PromiseInit native promise.js:46:21
448 2.5% 5 0.0% LazyCompile: *PromiseSet native promise.js:36:20
438 2.4% 2 0.0% /Users/bajtos/src/io.js/out/Release/node
420 2.3% 420 2.3% /Users/bajtos/src/io.js/out/Release/node
86 0.5% 2 0.0% /Users/bajtos/src/io.js/out/Release/node
50 0.3% 50 0.3% /usr/lib/system/libsystem_malloc.dylib
23 0.1% 23 0.1% /Users/bajtos/src/io.js/out/Release/node
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@petkaantonov
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In bluebird you would implement it like

var stat = Promise.promisify(fs.stat);
var statViaPromise = function(path, callback) {
    return stat(path).nodeify(callback);
}

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