Peter Geoghegan <pg@bowt.ie> writes:
> My development machine has 8 logical cores, and like you I only see
> the NOTICE from pg_upgrade's tests with "-j10":
> pg@bat:/code/postgresql/patch/build$ time make check-world -j10 >/dev/null
> NOTICE: database "regression" does not exist, skipping
> make check-world -j10 > /dev/null 86.40s user 34.10s system 140% cpu
> 1:25.94 total
> However, I see something else with "-j16", even after a precautionary
> clean + rebuild:
> pg@bat:/code/postgresql/patch/build$ time make check-world -j16 >/dev/null
> NOTICE: database "regression" does not exist, skipping
> pg_regress: could not open file
> "/code/postgresql/patch/build/src/test/regress/regression.diffs" for
> reading: No such file or directory
> make check-world -j16 > /dev/null 96.35s user 37.45s system 152% cpu
> 1:27.49 total
Yes, I see that too with sufficiently high -j. I believe this is
what Noah was trying to fix in bd1592e85, but that patch evidently
needs a bit more work :-(
regards, tom lane