Doing some tests on windows with node v0.8.11
var buf = new Buffer(1000);
buf.fill(0xFF);
var len = buf.length;
var a;
var start = new Date();
for(var b = 0 ; b < len; b++){
a = buf.readUInt8(b);
}
var end = new Date();
console.log('Buffer reads '
On Thu, Oct 4, 2012 at 1:37 AM, NodeNinja wrote:
> Doing some tests on windows with node v0.8.11
>
> var buf = new Buffer(1000);
> buf.fill(0xFF);
>
> var len = buf.length;
> var a;
> var start = new Date();
> for(var b = 0 ; b < len; b++){
> a = bu
On Thursday, October 4, 2012 5:13:30 AM UTC+5:30, Ben Noordhuis wrote:
>
>
> Don't use buf.readUInt8(), it's only there for the sake of parity with
> the other .readUInt*() functions. Replace it with `a = buf[b]` and
> you'll see a 4-5x speed-up.
>
Excellent suggestion Ben:
New results are ex
On Thu, Oct 4, 2012 at 1:51 AM, NodeNinja wrote:
>
>
> On Thursday, October 4, 2012 5:13:30 AM UTC+5:30, Ben Noordhuis wrote:
>>
>>
>> Don't use buf.readUInt8(), it's only there for the sake of parity with
>> the other .readUInt*() functions. Replace it with `a = buf[b]` and
>> you'll see a 4-5x s
On Thursday, October 4, 2012 5:44:16 AM UTC+5:30, Ben Noordhuis wrote:
>
> They won't, they're there mostly for convenience*.
>
Now that's an* eye opener* Ben!
I hope that line finds its way to the documentation.
Many thanks!!
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If you want *really* fast buffer access for larger integer types and float
types, you can set up a native module that
calls SetIndexedPropertiesToExternalArrayData a few times on your Buffer
and gives you a native indexed view into the buffer for whatever primitive
type you want to read (much,
Curious, shouldn't V8 be able to inline the readUInt8 function call, or
there's more than that?
On Thu, Oct 4, 2012 at 1:43 AM, Ben Noordhuis wrote:
> On Thu, Oct 4, 2012 at 1:37 AM, NodeNinja wrote:
> > Doing some tests on windows with node v0.8.11
> > -
On Thursday, October 4, 2012 9:49:20 PM UTC+5:30, Jimb Esser wrote:
>
> If you want *really* fast buffer access for larger integer types and float
> types, you can set up a native module that
> calls SetIndexedPropertiesToExternalArrayData a few times on your Buffer
> and gives you a native in
On Friday, October 5, 2012 1:58:17 AM UTC+5:30, Dan Milon wrote:
>
> Curious, shouldn't V8 be able to inline the readUInt8 function call, or
> there's more than that?
>
> That's what even I was thinking about if all the buf.read*() and
the buf.write*() functions are much slower than the indexed
On Thu, Oct 4, 2012 at 6:19 PM, Jimb Esser wrote:
> If you want *really* fast buffer access for larger integer types and float
> types, you can set up a native module that calls
> SetIndexedPropertiesToExternalArrayData a few times on your Buffer and gives
> you a native indexed view into the buff
On Fri, Oct 5, 2012 at 1:08 AM, NodeNinja wrote:
> On Friday, October 5, 2012 1:58:17 AM UTC+5:30, Dan Milon wrote:
>> Curious, shouldn't V8 be able to inline the readUInt8 function call, or
>> there's more than that?
>>
> That's what even I was thinking about if all the buf.read*() and the
> buf.
Ah, yeah, it does now! We wrote our module back on node 0.4, which, I
think, did not have typed arrays. That being said, it seems TypedArrays do
not support un-aligned views (e.g. if you're reading a stream and want to
read a F64 at byte offset 3, it throws an exception), as well they
shouldn
On Friday, October 5, 2012 8:00:45 AM UTC+5:30, Ben Noordhuis wrote:
You don't have to drop down to C++ for that, node.js supports typed
arrays[1]. I probably should have mentioned that in my other post. :-)
Thats some good news! :)
Besides, they're pure JS functions while buf[i] is an intr
On Friday, October 5, 2012 12:29:00 PM UTC+5:30, Jimb Esser wrote:
>
> The gist of it is just to take a Buffer, for each type you want to read
> (say, e.g, 32-bit ints), make a number of views equal to the possible byte
> offsets (e.g. 4) and then do a read with the right offset from the right
On Fri, Oct 5, 2012 at 8:59 AM, Jimb Esser wrote:
> Ah, yeah, it does now! We wrote our module back on node 0.4, which, I
> think, did not have typed arrays. That being said, it seems TypedArrays do
> not support un-aligned views (e.g. if you're reading a stream and want to
> read a F64 at byte
On Fri, Oct 5, 2012 at 1:03 PM, NodeNinja wrote:
> Is there a comprehensive list of what functions are intrinsic and which
> functions are in pure JS?
Basically anything that's not an operator is a function. That's also
true for JS built-ins like Array.prototype.sort(), etc.
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