RAW performance speedup

May 10, 2016 posted by: Elias

Good news for those of you who often work with nodes in the RAW category. The general performance overhead has been reduced by quite a bit in the latest alpha version of vvvv. The respective commit can be found here.

This was achieved by an internal change to work with the IStream interface directly, instead of wrapping it in adapter classes, exposing it either as System.IO.Stream to .NET or TStream to Delphi. So a downstream plugin node will now have direct access to the upstream stream output, instead of going through an internal adapter class.

In case you write your own plugins and you want to keep the overhead as small as possible create your own custom Stream class, which implements the before mentioned IStream interface - for example have a look at the ComStream.*.cs files here and nodes making use of it here.

Thanks to woeiuser and jens.a.euser for reporting the performance issues and keeping on nagging me about it ;)


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10.05.2016 - 15:05
10.05.2016 - 16:55
of course we like it raw!
10.05.2016 - 17:07

it might have to do something with these changes: in here: title

AsValue freaking out like this:

System.OverflowException: Array dimensions exceeded supported range.
   at System.IO.ComAdapterStream.Read(Byte[]()()() buffer, Int32 offset, Int32 count)
   at System.IO.TakeStream.Read(Byte[]()()() buffer, Int32 offset, Int32 count)
   at System.IO.BinaryReader.ReadBytes(Int32 count)
   at VVVV.Nodes.Raw.AsValueNode.ConvertAllAtOnce(Stream srcStream, MemoryIOStream`1 dstStream, Double[]()()() buffer, ValueTypeFormat format, ByteOrder byteOrder)
   at VVVV.Nodes.Raw.AsValueNode.Evaluate(Int32 spreadMax)
   at VVVV.Hosting.IO.PluginContainer.Evaluate(Int32 spreadMax)

But if I take out Take (note the pun) all fine.

Update: Any Raw sink node freaks out after Take in this situation Update2: Problem occurs when raw stream coming from AsRaw (String) but AsRaw (Value) is fine

10.05.2016 - 18:27
nice. will test
12.05.2016 - 23:17

also + (Raw Spectral) doesn’t like the changes:

System.ObjectDisposedException: Cannot access a closed Stream.
   at System.IO.__Error.StreamIsClosed()
   at System.IO.MemoryStream.get_Length()
   at VVVV.Nodes.Raw.PlusSpectralNode.Evaluate(Int32 spreadMax)
   at VVVV.Hosting.IO.PluginContainer.Evaluate(Int32 spreadMax)
14.05.2016 - 21:31
Thx for the report. Will have a look at it mid next week.
16.05.2016 - 02:05
CAR was bugging too.
18.05.2016 - 20:35
@microdee @velcrome Does it work for you now (950187a459)?
21.05.2016 - 21:04
seems to be in order now, that gibberish about alt+3 was just my sinister sneaky keyboard configuration



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