All the shells I have installed (bash, dash, tcsh) support floating point arguments to sleep and they really try to sleep for the specified non-integer time. (See for example lib/sh/ufuncs.c in bash).

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^2: Perl threads loss of performance with system call by choroba
in thread Perl threads loss of performance with system call by daniel85

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