Add RSS memory usage to reporting

src/solver/solve.jl

@@ -1,4 +1,5 @@
 import ClimaTimeSteppers as CTS
+import Base.Sys: maxrss
 
 struct EfficiencyStats{TS <: Tuple, WT}
     tspan::TS
@@ -74,6 +75,15 @@ function solve_atmos!(simulation)
         return AtmosSolveResults(nothing, :simulation_crashed, nothing)
     finally
         # Close all the files opened by the writers
+
+        maxrss_bytes = maxrss()
+        maxrss_str =
+            maxrss_bytes > 2^30 ?
+            "$(round(maxrss_bytes / 2^30, digits = 2)) GiB" :
+            "$(round(maxrss_bytes / 2^20, digits = 2)) MiB"
+
+        @info "Memory currently used by the process (RSS): $maxrss_str"
+
         foreach(CAD.close, output_writers)
     end
 end