Re^2: Time::HiRes not that high on windows

in reply to Re: Time::HiRes not that high on windows
in thread Time::HiRes not that high on windows

Hi all

while reading this, I tested it on my XP (ActivePerl 5.8) and got this :

1130370142.0764
1130370142.07657
1130370142.07669
1130370142.07679
1130370142.07691
1130370142.07701
1130370142.07712
1130370142.07723
1130370142.07734
1130370142.07745

Has it maybe something to do with cygwin or have I missed something

Have a nice day

Comment on Re^2: Time::HiRes not that high on windows

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Re^3: Time::HiRes not that high on windows by BrowserUk (Patriarch) on Oct 27, 2005 at 00:40 UTC
Wow! A rave from the grave :) This thread relates to an very old version of Time::HiRes. Later versions use a different system API to allow much higher resolution. For further reading see thread at Perl -de1 weirdness. and particularly Re^4: Perl -de1 weirdness.. The resolution under windows is now comparable at around the 7 microsecond mark (on my machine. It will vary somewhat with the speed of your cpu). Certainly faster than a Perl script can report it. Though the weirdness with Time::HiRes when running under the debugger persists into 5.8.6: C:\perl5.8.6\bin>.\perl -MTime::HiRes=time -le"print time() for 1 .. 1 +0;" 1130373293.29716 1130373293.29732 1130373293.29739 1130373293.2976 1130373293.29766 1130373293.29784 1130373293.2979 1130373293.29807 1130373293.29814 1130373293.29831 C:\perl5.8.6\bin>.\perl -de1 Loading DB routines from perl5db.pl version 1.25 Editor support available. Enter h or `h h' for help, or `perldoc perldebug' for more help. main::(-e:1): 1 DB<1> use Time::HiRes 'time'; DB<2> print time(), $/ for 1 .. 10;; 1130373253.21875 1130373253.21875 1130373253.21875 1130373253.21875 1130373253.21875 1130373253.21875 1130373253.21875 1130373253.21875 1130373253.21875 1130373253.21875 DB<3> q [download] Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal? "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply] [d/l]

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Re^3: Time::HiRes not that high on windows
by BrowserUk (Patriarch) on Oct 27, 2005 at 00:40 UTC

Wow! A rave from the grave :)

This thread relates to an very old version of Time::HiRes. Later versions use a different system API to allow much higher resolution. For further reading see thread at Perl -de1 weirdness. and particularly Re^4: Perl -de1 weirdness..

The resolution under windows is now comparable at around the 7 microsecond mark (on my machine. It will vary somewhat with the speed of your cpu). Certainly faster than a Perl script can report it.

Though the weirdness with Time::HiRes when running under the debugger persists into 5.8.6:

C:\perl5.8.6\bin>.\perl -MTime::HiRes=time -le"print time() for 1 .. 1
+0;"
1130373293.29716
1130373293.29732
1130373293.29739
1130373293.2976
1130373293.29766
1130373293.29784
1130373293.2979
1130373293.29807
1130373293.29814
1130373293.29831

C:\perl5.8.6\bin>.\perl -de1

Loading DB routines from perl5db.pl version 1.25
Editor support available.

Enter h or `h h' for help, or `perldoc perldebug' for more help.

main::(-e:1):   1
  DB<1> use Time::HiRes 'time';

  DB<2> print time(), $/ for 1 .. 10;;
1130373253.21875
1130373253.21875
1130373253.21875
1130373253.21875
1130373253.21875
1130373253.21875
1130373253.21875
1130373253.21875
1130373253.21875
1130373253.21875

  DB<3> q
[download]

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

[reply]
[d/l]

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