russellh@jailbird:~ % uname -a
FreeBSD jailbird 11.1-RELEASE FreeBSD 11.1-RELEASE #0: Sat Jun  2 22:49:42 PDT 2018     russellh@sylvester:/usr/obj/usr/src/sys/GENERIC  amd64

#### Lua 5.3
russellh@jailbird:~ % time lua53 gc_benchmark.lua
Lua 5.3
75.347u 7.164s 1:22.51 99.9%    284+172k 2+0io 0pf+0w
~8.1gb

russellh@jailbird:~ % time lua53 gc_benchmark.lua
Lua 5.3
83.345u 7.976s 1:31.32 99.9%    284+172k 2+0io 0pf+0w
8013M

russellh@jailbird:~ % time lua53 gc_benchmark.lua
Lua 5.3
78.657u 7.300s 1:25.95 100.0%   284+172k 2+0io 0pf+0w
---------------------------------------------------
##### Lua 5.4
russellh@jailbird:~ % time lua-5.4.0-work2/src/lua gc_benchmark.lua
Lua 5.4
132.341u 5.968s 2:18.31 99.9%   330+172k 2+0io 0pf+0w
6910MB

russellh@jailbird:~ % time lua-5.4.0-work2/src/lua gc_benchmark.lua
Lua 5.4
139.874u 6.291s 2:26.16 100.0%  330+172k 2+0io 0pf+0w
6959M

russellh@jailbird:~ % time lua-5.4.0-work2/src/lua gc_benchmark.lua
Lua 5.4
137.356u 6.228s 2:23.58 99.9%   330+172k 2+0io 0pf+0w
6917M