################################################################################ #------------------------------------------------------------------------------- hires_test.pl #------------------------------------------------------------------------------- #!/usr/bin/perl -w use warnings; use strict; use Time::HiRes qw(gettimeofday sleep usleep time); print "Time::HiRes\n"; print "VERSION:" . Time::HiRes->VERSION . "\n\n"; print `uname -a` . "\n"; my $index = 1000; print "usleep (usec)\n(requested == actual)\n"; while ( $index <= 40_000 ){ print "$index == " . Time::HiRes::usleep($index) . "\n"; $index += 1000; } print "\n\n"; $index = 0.001000; print "sleep (sec)\n(requested == actual)\n"; while ( $index <= 0.0405 ){ print "$index == " . Time::HiRes::sleep($index) . "\n"; $index += 0.001; } exit; #------------------------------------------------------------------------------- machine A #------------------------------------------------------------------------------- Time::HiRes VERSION:1.66 Linux **** 2.6.10-1.741_FC3 #1 Thu Jan 13 16:38:22 EST 2005 i686 athlon i386 GNU/Linux usleep (usec) (requested == actual) 1000 == 2348 2000 == 3944 3000 == 4987 4000 == 5990 5000 == 6992 6000 == 7980 7000 == 8985 8000 == 9963 9000 == 10981 10000 == 11983 11000 == 12984 12000 == 13981 13000 == 14988 14000 == 15990 15000 == 16982 16000 == 17987 17000 == 18989 18000 == 19979 19000 == 20987 20000 == 21983 21000 == 22979 22000 == 23987 23000 == 24981 24000 == 25988 25000 == 27055 26000 == 27904 27000 == 28964 28000 == 29954 29000 == 30979 30000 == 31979 31000 == 32966 32000 == 33977 33000 == 34978 34000 == 35984 35000 == 36978 36000 == 37977 37000 == 38977 38000 == 39977 39000 == 40978 40000 == 41967 sleep (sec) (requested == actual) 0.001 == 0.0029 0.002 == 0.00398 0.003 == 0.004987 0.004 == 0.005988 0.005 == 0.006988 0.006 == 0.00802 0.007 == 0.008951 0.008 == 0.009986 0.009 == 0.010988 0.01 == 0.011987 0.011 == 0.012988 0.012 == 0.01398 0.013 == 0.014987 0.014 == 0.016016 0.015 == 0.016951 0.016 == 0.01798 0.017 == 0.018981 0.018 == 0.01998 0.019 == 0.020985 0.02 == 0.021986 0.021 == 0.022979 0.022 == 0.023986 0.023 == 0.024976 0.024 == 0.025986 0.025 == 0.026977 0.026 == 0.027984 0.027 == 0.028981 0.028 == 0.029961 0.029 == 0.030975 0.03 == 0.031948 0.031 == 0.032976 0.032 == 0.033974 0.033 == 0.034979 0.034 == 0.035964 0.035 == 0.036971 0.036 == 0.037975 0.037 == 0.038975 0.038 == 0.039982 0.039 == 0.040967 0.04 == 0.041976 #------------------------------------------------------------------------------- machine B #------------------------------------------------------------------------------- Time::HiRes VERSION:1.38 Linux **** 2.4.21-27.0.2.ELsmp #1 SMP Wed Jan 12 23:35:44 EST 2005 i686 i686 i386 GNU/Linux usleep (usec) (requested == actual) 1000 == 16799 2000 == 19946 3000 == 20013 4000 == 19946 5000 == 19980 6000 == 20005 7000 == 19982 8000 == 19973 9000 == 19981 10000 == 19962 11000 == 29982 12000 == 29995 13000 == 29958 14000 == 29994 15000 == 29984 16000 == 29982 17000 == 29997 18000 == 29964 19000 == 29980 20000 == 29981 21000 == 40021 22000 == 39907 23000 == 39976 24000 == 40009 25000 == 39913 26000 == 39996 27000 == 39997 28000 == 39872 29000 == 39990 30000 == 39930 31000 == 49968 32000 == 49956 33000 == 49973 34000 == 49993 35000 == 49980 36000 == 49973 37000 == 49952 38000 == 49984 39000 == 49985 40000 == 49973 sleep (sec) (requested == actual) 0.001 == 0.019934 0.002 == 0.019998 0.003 == 0.019987 0.004 == 0.020042 0.005 == 0.019919 0.006 == 0.019972 0.007 == 0.019994 0.008 == 0.01998 0.009 == 0.019969 0.01 == 0.019971 0.011 == 0.030011 0.012 == 0.02996 0.013 == 0.029991 0.014 == 0.029958 0.015 == 0.030004 0.016 == 0.029987 0.017 == 0.029976 0.018 == 0.029925 0.019 == 0.030006 0.02 == 0.029951 0.021 == 0.039992 0.022 == 0.040002 0.023 == 0.039903 0.024 == 0.040005 0.025 == 0.039938 0.026 == 0.039966 0.027 == 0.039988 0.028 == 0.039985 0.029 == 0.039929 0.03 == 0.039984 0.031 == 0.04994 0.032 == 0.049978 0.033 == 0.049945 0.034 == 0.049982 0.035 == 0.049987 0.036 == 0.049972 0.037 == 0.049978 0.038 == 0.049998 0.039 == 0.049942 0.04 == 0.049978 #------------------------------------------------------------------------------- machine B #------------------------------------------------------------------------------- Time::HiRes VERSION:1.66 Linux **** 2.4.21-27.0.2.ELsmp #1 SMP Wed Jan 12 23:35:44 EST 2005 i686 i686 i386 GNU/Linux usleep (usec) (requested == actual) 1000 == 15854 2000 == 19939 3000 == 19971 4000 == 19949 5000 == 19988 6000 == 20001 7000 == 19947 8000 == 19992 9000 == 19970 10000 == 19988 11000 == 29955 12000 == 29984 13000 == 29978 14000 == 29944 15000 == 29988 16000 == 29984 17000 == 29951 18000 == 30014 19000 == 29929 20000 == 29953 21000 == 39999 22000 == 39943 23000 == 40009 24000 == 39936 25000 == 39962 26000 == 39954 27000 == 39994 28000 == 39976 29000 == 39932 30000 == 39967 31000 == 49959 32000 == 49923 33000 == 49968 34000 == 49965 35000 == 49968 36000 == 50005 37000 == 49908 38000 == 49961 39000 == 49950 40000 == 49990 sleep (sec) (requested == actual) 0.001 == 0.019945 0.002 == 0.020002 0.003 == 0.019968 0.004 == 0.019985 0.005 == 0.019993 0.006 == 0.019974 0.007 == 0.019986 0.008 == 0.020003 0.009 == 0.019971 0.01 == 0.019971 0.011 == 0.029993 0.012 == 0.02998 0.013 == 0.029989 0.014 == 0.029984 0.015 == 0.030005 0.016 == 0.029949 0.017 == 0.030052 0.018 == 0.029874 0.019 == 0.029999 0.02 == 0.029974 0.021 == 0.039991 0.022 == 0.039957 0.023 == 0.03998 0.024 == 0.039974 0.025 == 0.039976 0.026 == 0.039951 0.027 == 0.03998 0.028 == 0.039994 0.029 == 0.039952 0.03 == 0.039976 0.031 == 0.049965 0.032 == 0.049999 0.033 == 0.049979 0.034 == 0.049948 0.035 == 0.049969 0.036 == 0.049979 0.037 == 0.049988 0.038 == 0.049942 0.039 == 0.049968 0.04 == 0.049934