Failed unit test: rise::scenario::pathloss::tests::ITUPathlossTest::testRNG

[Jan]

Hi,

after a clean checkout from launchpad, one unittest fails on our systems:

1) test: N4rise8scenario8pathloss5tests15ITUPathlossTestE::testRNG (F) line: 229 framework/rise/src/scenario/pathloss/tests/ITUPathlossTest.cpp
double equality assertion failed
- Expected: 1
- Actual : 0.881695160600658
- Delta : 0.03

After looking at the code in question in framework/rise/src/scenario/pathloss/tests/ITUPathlossTest.cpp it seems to me that it basically checks whether a number of random values from the detail::HashRNG have a mean value close enough to 1. Maybe, on our systems these random numbers come in a different sequence and maybe it was a coincidence that the mean did not deviate much from 1 on your systems.

When changing the stepsize from 0.1 to 0.01 in that test (creates 1000x as many random values) the mean gets closer to 1 but still is not close enough for the test to succeed:

- Expected: 1
- Actual : 0.935649913756681
- Delta : 0.03

So, do you think it is a bug in the simulator, a bug on our system here or was it just a coincidence that it worked OK for you? Or does the test fail for you as well?

Cheers
Jan

[Maciej Muehleisen (mue-comnets)]

We can config the problem and will provide a fix soon.

[Daniel Bültmann (daniel.bueltmann)]

Hi Jan,

do you work on a standard 64bit Ubuntu lucid system? We had a problem when migrating to 64bit with the boost hashing function. I wonder if this is the same problem. Can you report your Ubuntu version, boost version and your compiler target architecture?

Regards,
  Daniel

[Maciej Muehleisen (mue-comnets)]

We now use our own Hashing function which is system independent