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-j2? -j4? (Score:2)

by jhi (318)

Just out of curiosity, it would be nice to know whether the traditional wisdom of overcommitting by one processor works (that is, is -j3 really faster than -j2), and also how much overovercommitting (-j4) trashes the systems?
- Re:-j2? -j4? (Score:2)
  
  by pudge (1) on 2003.09.20 2:11 (#24364) Homepage Journal
  
  Just for the heck of it, on a dual proc Xeon/2.4GHz, also with 2GB RAM:
  
  make -j3, Xeon:
  real 1m29.770s user 3m57.040s sys 0m16.460s
  make -j5, Xeon:
  real 1m25.995s user 4m59.250s sys 0m18.930s
  This machine does "hyper-threading", so it thinks it has four processors even though it has only two, hence the -j5 run. Doesn't seem to make much difference. Anyway, this Xeon compiles perl faster than the G5, by a lot. I don't know if it means anything, though.
  
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