Dan here are the truss outputs
-bash-3.00$ truss -c ./fileio-fs-fs #compiled using CC
syscall seconds calls errors
_exit .000 1
read .345 17198
write 13.249 1000000
open .030 9 1
close .000 8
brk .000 16
stat .000 20 14
lseek 45.362 6017204
getpid .000 1
ioctl .000 2
execve .000 1
getcontext .000 1
setustack .000 1
mmap .000 23
munmap .000 5
getrlimit .000 1
memcntl .000 4
lwp_private .000 1
resolvepath .000 7
getcwd .000 1
-------- ------ ----
sys totals: 58.990 7034504 15
usr time: 14.834
elapsed: 344.020
-bash-3.00$ truss -c ./fileio-fs-fs.g++ #compiled using g++
syscall seconds calls errors
_exit .000 1
read 1.541 137713
write 12.917 1000000
open .116 8 1
close .000 7
brk .000 2
stat .000 17 11
lseek .000 1
getpid .000 1
sysi86 .000 1
execve .000 1
getcontext .000 1
setustack .000 1
mmap .000 24
munmap .000 5
getrlimit .000 1
memcntl .000 4
sysconfig .000 1
lwp_private .000 1
resolvepath .000 7
getcwd .000 1
-------- ------ ----
sys totals: 14.576 1137798 12
usr time: 4.239
elapsed: 63.310
-bash-3.00$
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