assignUser commented on PR #39522:
URL: https://github.com/apache/arrow/pull/39522#issuecomment-1885237395

   I build jemalloc with our release configure command and `make` vs `make -j1`:
   - `./test.sh  56.47s user 7.29s system 102% cpu 1:02.35 total` 
   - `./test.sh  57.22s user 7.05s system 103% cpu 1:02.16 total`
   
   So it seems that make defaults to a mostly single core build anyway, this 
just removes issues we had. 
   
   Explicitly passing -j16 to the jemalloc build interestingly also fixes the 
issue and does not show the warning mentioned in 
https://github.com/apache/arrow/pull/2779. It might be enough to remove that 
change/conditional. I have tested  this on ubuntu 20.04 with cmake 3.16 and it 
also works there. (I think cmake decoupled external projects from the main make 
by adding a cmake layer inbetween at some point prior to 3.16).
   I'll open a PR.


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