Hello Roman,
we will publish the results in a scientific journal. Unfortunately we're not allowed to publish the results in other places beforehand. I try to remember to place the link to the paper to this email thread. (Unfortunately one will have to buy the results - unless someone would fund us an "open access" for the paper).
In the final research we did not compare OpenMP to IPC. OpenMP was about 10 times slower so we moved to IPC - one can control the cache operation better when using IPC anyway. However that does not mean that OpenMP is allways 10 times slower (on C6678). Maybe it was related to our use-case and we didn't spent much effort to the OpenMP prototype as we felt that IPC will be the better solution anyway (the solution that takes mor effort - but gives more control).