on 22/03/2007 15:06 Olson, Arthur David (NIH/NCI) [E] said the following: > Check the version of zdump in use with a... > zdump --version > ...command; starting with the February 2006 (8.1) version, output has been > limited to run from the year -500 to the year 2500 by default. The range can > be changed using the... > -c [loyear],hiyear > ...option.
Thank you for the pointer! I guess it is a question of updating FreeBSD sources from upstream now: $ zdump --version zdump: @(#)zdump.c 7.31 > -----Original Message----- > From: Andriy Gapon [mailto:[EMAIL PROTECTED] > Sent: Wednesday, March 21, 2007 10:13 AM > To: [EMAIL PROTECTED]; [email protected] > Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED] > Subject: Re: zdump on amd64 > > on 19/03/2007 16:15 Andriy Gapon said the following: >> Strange problem: >> $ uname -srm >> FreeBSD 6.2-RELEASE-p2 amd64 >> >> $ zdump -v EST >> EST Sun Jan 26 08:29:52 -219 UTC = Sun Jan 26 03:29:52 -219 EST isdst=0 >> gmtoff=-18000 >> EST Mon Jan 27 08:29:52 -219 UTC = Mon Jan 27 03:29:52 -219 EST isdst=0 >> gmtoff=-18000 >> EST Fri Jan 1 04:59:59 -219 UTC = Thu Dec 30 23:59:59 -219 EST isdst=0 >> gmtoff=-18000 >> EST Fri Jan 1 05:00:00 -219 UTC = Fri Jan 1 00:00:00 -219 EST isdst=0 >> gmtoff=-18000 >> ^C > ... >> Before each ^C zdump was hanging eating 100% CPU. >> Something about 64-bitness ? > > Hmm. I hurried to assert that it was hanging, it was actually searching. > It seems that zdump -v algorithm is to start with minimal time_t > possible (large negative number in our case) and to go to maximum time_t > using 12 hours increments and doing certain checks for DST jumps. > Well, with 64-bit time_t start date is somewhere 200 milliard (10^9) > years ago and end date is the same in the future, so iteration over > those years takes quite a while. And tz db doesn't contain anything > useful for too distant years anyway. > > I think that zdump should be optimized to limit its search range. At the > very least for the start point - what is current estimate of the age of > our Universe :-) > > -- Andriy Gapon _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
