Jump to content

LabVIEW 2009 vs LV8.6.1 Queue performance


Mellroth

Recommended Posts

I'm just starting to play with LV2009, and tested the DVR against a Single Element Queue (SEQ).

Compared to a SEQ in LabVIEW 8.6.1 the DVR runs about 2 times faster, but if I compare the SEQ speed in LV 2009 against SEQ speed in LV 8.6.1 the speed has decreased. The access time in LV 2009 goes up ~30%.

After seeing this I also measured the time it takes to add 100 000 elements (I32 values) to a queue and then remove them. In LV8.6.1 this takes ~80ms, in LV2009 it takes ~105ms, which is pretty close to 30% increase in access time.

Have anyone else seen this, or any other decrease in performance?

/J

Link to comment

LV 2009 has had some significant changes made under the hood. I don't know the specific details, but my understanding was that it could cause decreased performance in some cases and that NI is expecting this to improve in future versions.

It was my understanding that the changes made to the compiler shouldn't have made things worse, but allow for more future optimizations.

Obviously I was wrong :(

The good part, however, is that the DVR outperforms the SEQ. It is therefore possible to tweak all instances where SEQs are used.

All Producer-Consumer patterns, using queues, will still be 30% slower.

Do you know of any other slowdown in LabVIEW 2009 to be aware of?

/J

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.