San Diego User Group Meeting on Wednesday, September 17th

[Mike_Le]

The venue is also alcohol-friendly, so we may be bringing some craft beer. Any requests? Can't promise anything, but we'll try if it's easy to get.   

[isaacvega]

I'll be there.

[Todd_SD]

Hi Song!  Voltero's Pizza is my favorite pizza in SD and it's 3 blocks away.  They have fantastic pizza and good prices.

https://www.google.com/maps/dir/Ansir+Innovation+Center,+4685+Convoy+St+Suite+210,+San+Diego,+CA+921...

[Mike_Le]

We're going to try to broadcast the meeting for those of you who cannot attend in-person.

Because this is our first meeting, we may have some technical difficulties to iron out. We'll be using TeamViewer Google Hangout, which is a free and easy-to-use meeting application.

The meeting should go live when the meeting starts at 6pm Pacific on Wednesday.

https://plus.google.com/events/ckt7o8j0eimdbgg0lqtnqlh0if8

[Mike_Cyth]

See you there!

-Mike

[AndrewRussell]

I will be attending.

Beer?  Indian Wells Whiskey Barrel Amber (and if anyone knows where to find this in San Diego, let me know!)

Andrew Russell

Solar Turbines, Inc

[Mike_Le]

Thanks so much for everyone who was able to make it out!

Sorry about the room hiccups, but I hope you all had a great time. It was definitely good to meet all of you and talk a bit about what you're working on.

Special thanks to Tom and Ivan for presenting, and for Shawn and Song for organizing the pizza and beer.

We're planning on the next one (with air conditioning!) for early December. If anyone's interested in presenting, hit me up.

Best,

Mike Le

[InfiniteNothing]

Here's the VIs from my presentation (saved for LV2009, when the parallel for loop was introduced)

https://decibel.ni.com/content/docs/DOC-39553

If you have any questions, you can contact me through the forums or LinkedIn: https://www.linkedin.com/pub/ivan-gagn%C3%A9/2/96b/4b

Techniques:

Low lying fruit:

• Experiment with the execution options. Disabling debug always helps but experiment with the other two.

  More info about subroutine priority here: http://zone.ni.com/reference/en-XX/help/371361L-01/lvconcepts/prioritizing_paral lel_tasks/

• Remove binary array manipulation. Move bits left and right using the shift operator.

Before:

After:

• Remove inner for loop, use U8 arrays instead of strings, and eliminate dynamic memory allocation

Before:

After:

• Calculate a lookup table (2014 snippet below and in the zip) ahead of time to eliminate search time

Parallel for loop benchmark:

Method	Encode 1 Million 4-8 byte strings (ms)	Decode 1 Million 4-8 byte strings (ms)
Serial (Subroutine)	351	448
Parallel	16372	3576
Parallel  + Subroutine priority	n/a	500

Method	Encode 50 MB String (ms)	Decode 50 MB string (ms)
Serial (Subroutine)	367	339
Parallel	294	718
Parallel  + Subroutine priority	n/a	672

[Mike_Le]

Thanks Ivan!

Tom Fantasia's presentation on his Class-Based DAQ API has also been uploaded to the Group Documents:

https://decibel.ni.com/content/docs/DOC-39554

[doradorachan]

Mike, thanks for taking the effort to host it.

Looking forward to the meeting in December.

Jeff Y