$ export TIMEFMT='%J   %U  user %S system %P cpu %*E total
avg shared (code):         %X KB
avg unshared (data/stack): %D KB
total (sum):               %K KB
max memory:                %M MB
page faults from disk:     %F
other page faults:         %R'


$ time dub build
Fetching lu 0.2.1 (getting selected version)...
Fetching dialect 0.4.1 (getting selected version)...
Performing "debug" build using /usr/bin/dmd for x86_64.
lu:core 0.2.1: building configuration "library"...
lu:meld 0.2.1: building configuration "library"...
dialect 0.4.1: building configuration "library"...
lu 0.2.1: building configuration "library"...
lowmem ~lowmem: building configuration "default"...
Linking...
dub build   5.61s  user 0.97s system 77% cpu 8.489 total
avg shared (code):         0 KB
avg unshared (data/stack): 0 KB
total (sum):               0 KB
max memory:                2011 MB
page faults from disk:     0
other page faults:         765923


$ time /usr/bin/dmd -dip25 -dip1008 -dip25 -dip1008 -dip25 -dip1008 -dip25 -dip1008 -c -ofout -debug -g -w -version=Have_lowmem -version=Have_dialect -version=Have_lu -version=FlagAsUpdated -version=Have_lu_core -version=Have_lu_meld -Isource -I~/.dub/packages/dialect-0.4.1/dialect/source -I~/.dub/packages/lu-0.2.1/lu/source/ -I~/.dub/packages/lu-0.2.1/lu/source source/kameloso/common.d source/kameloso/constants.d source/kameloso/getopt.d source/kameloso/irccolours.d source/kameloso/kameloso.d source/kameloso/logger.d source/kameloso/main.d source/kameloso/messaging.d source/kameloso/plugins/common.d source/kameloso/plugins/package.d source/kameloso/printing.d source/kameloso/terminal.d source/kameloso/thread.d source/kameloso/traits.d -vcolumns
/usr/bin/dmd -dip25 -dip1008 -dip25 -dip1008 -dip25 -dip1008 -dip25 -dip1008    3.63s  user 0.53s system 99% cpu 4.168 total
avg shared (code):         0 KB
avg unshared (data/stack): 0 KB
total (sum):               0 KB
max memory:                2012 MB
page faults from disk:     0
other page faults:         500088


$ time dub build -c lowmem
Performing "debug" build using /usr/bin/dmd for x86_64.
lu:core 0.2.1: target for configuration "library" is up to date.
lu:meld 0.2.1: target for configuration "library" is up to date.
dialect 0.4.1: target for configuration "library" is up to date.
lu 0.2.1: target for configuration "library" is up to date.
lowmem ~lowmem: building configuration "lowmem"...
Linking...
To force a rebuild of up-to-date targets, run again with --force.
dub build -c lowmem   3.90s  user 0.58s system 99% cpu 4.504 total
avg shared (code):         0 KB
avg unshared (data/stack): 0 KB
total (sum):               0 KB
max memory:                2011 MB
page faults from disk:     0
other page faults:         521008


$ time /usr/bin/dmd -lowmem -dip25 -dip1008 -dip25 -dip1008 -dip25 -dip1008 -dip25 -dip1008 -c -ofout -debug -g -w -version=Have_lowmem -version=Have_dialect -version=Have_lu -version=FlagAsUpdated -version=Have_lu_core -version=Have_lu_meld -Isource -I~/.dub/packages/dialect-0.4.1/dialect/source -I~/.dub/packages/lu-0.2.1/lu/source/ -I~/.dub/packages/lu-0.2.1/lu/source source/kameloso/common.d source/kameloso/constants.d source/kameloso/getopt.d source/kameloso/irccolours.d source/kameloso/kameloso.d source/kameloso/logger.d source/kameloso/main.d source/kameloso/messaging.d source/kameloso/plugins/common.d source/kameloso/plugins/package.d source/kameloso/printing.d source/kameloso/terminal.d source/kameloso/thread.d source/kameloso/traits.d -vcolumns
/usr/bin/dmd -lowmem -dip25 -dip1008 -dip25 -dip1008 -dip25 -dip1008 -dip25     8.15s  user 0.15s system 152% cpu 5.439 total
avg shared (code):         0 KB
avg unshared (data/stack): 0 KB
total (sum):               0 KB
max memory:                1183 MB
page faults from disk:     0
other page faults:         37664