jacinda-3.3.0.0: lib/prefixSizes.jac
fn prettyMem(x) :=
?x>=1073741824.0
;sprintf'%f.2 GB' (x%1073741824.0)
;?x>=1048576.0
;sprintf'%f.2 MB' (x%1048576.0)
;?x>=1024.0
;sprintf'%f.2 kB' (x%1024.0)
;sprintf'%f.0 b' x;
{. du reports memory in bytes by default
fn duMem(x) := prettyMem(x*1024.0);