[issue37159] Have shutil.copyfile() use copy_file_range()

Change by Giampaolo Rodola' : -- nosy: +StyXman, desbma, facundobatista, martin.panter, ncoghlan, neologix, pablogsal, petr.viktorin, vstinner ___ Python tracker ___

[issue37159] Have shutil.copyfile() use copy_file_range()

New submission from Giampaolo Rodola' : This is a follow up of issue33639 (zero-copy via sendfile()) and issue26828 (os.copy_file_range()). On [Linux 4.5 / glib 2.27] shutil.copyfile() will use os.copy_file_range() instead of os.sendfile(). According to my benchmarks performances are the