enabeling openmp slows down R
Bug #950598 reported by
zarquon42
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
r-base (Ubuntu) |
New
|
Undecided
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Unassigned |
Bug Description
Due to other issues, I found out, that R for Ubuntu is compiled with openmp enabled by default. This causes two issues:
1. General perfomance is decreased (on my desktop and my laptop its about 3[!] times slower)
2. revolution-mkl makes R stalling (which makes the entire package revolution-mkl useless with the R-version from the repos.
Are there distinct reasons for enabeling openmp by default?
Greetings
Stefan
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Forget the first argument - it just happened to be an accident: As I am on 12.04 beta, there seemed to have been something fixed --before-- I recompiled R (I did it on both machines at the same time - unfortunately). And the speed results turned out to be better due to other causes. But the second point remains: revolution-mkl makes R stall under some circumstances (e.g. using mclapply from the parallel package).
Regards
Stefan