RTI 4.5f vs 5.0 - Losing samples now

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Last seen: 10 years 8 months ago
Joined: 03/29/2013
Posts: 3
RTI 4.5f vs 5.0 - Losing samples now


Here's the situation.   We have a home-brew DDS data recorder that when compiled using the 4.5f libraries will easily handle up to 200,000 108-byte data samples per second.   If we compile the exact same sotfware using the 5.0 libraries the data rate we can handle drops to 75,000 samples per second.  The QOS files are identical in both cases although it has been modified to accomodate the 5.0 version.

Other interesting points:

  • The 4.5f version of our recorder does not use as much CPU as the 5.0 version.   80% vs. 100+% at 90,000 samples/second.
  • The function/method 'loan_serialized_bufferI()' returns a data size of 108 bytes for the 4.5f version and 105 bytes for the 5.0 version.  The input data is the same in both cases.

We have tried some run-time code profiling using valgrind with the callgrind tool.  The results are inconclusive to the ignorant (us). 
Any help here would be greatly appreciated.





rip's picture
Last seen: 2 hours 4 min ago
Joined: 04/06/2012
Posts: 324

Hi Paul,

What architecture are you on, and can you tell me if you are using an unpatched version of 5.0.0? 

You might need to send a reproducer to support to get to the bottom of it.