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gar1t
Posted: Mon Jul 12, 2010 4:46 am Reply with quote
User Joined: 11 Aug 2009 Posts: 55
I'm getting this:

1> {calendar:now_to_local_time(erlang:now()), erlang:localtime()}.
{{{2010,7,11},{23,36,54}},{{2010,7,11},{23,35,20}}}

erlang:now() is giving a result that's ~90 seconds in the future
(according to the OS clock - e.g. `date`)

I'm running VMWare and `hwclock` gives a "Cannot access the Hardware
Clock via any known method."

The docs state that "some other method" may be used to calculate the
now value if the OS doesn't support epoch time reporting.

Any thoughts on this?

Garrett

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gar1t
Posted: Mon Jul 12, 2010 3:08 pm Reply with quote
User Joined: 11 Aug 2009 Posts: 55
Yah, this was indeed the issue. I wasn't running hwclock as root. The
potential drift between system time and "hardware" clock on VMWare is
pretty awful.

It is somewhat surprising though that calendar and erlang:now/0 use
different sources for their time.

Garrett

On Mon, Jul 12, 2010 at 8:59 AM, Salomon Elizondo <selizondo@gmail.com> wrote:
> double check that your system time is up2date.
> sudo /usr/sbin/ntpdate -u time-a.nist.gov
> sudo /sbin/hwclock --systohc
>
> bug in vmware search "vmware clock drift"
>
>
> On Sun, Jul 11, 2010 at 11:43 PM, Garrett Smith <g@rre.tt> wrote:
>> I'm getting this:
>>
>> 1> {calendar:now_to_local_time(erlang:now()), erlang:localtime()}.
>> {{{2010,7,11},{23,36,54}},{{2010,7,11},{23,35,20}}}
>>
>> erlang:now() is giving a result that's ~90 seconds in the future
>> (according to the OS clock - e.g. `date`)
>>
>> I'm running VMWare and `hwclock` gives a "Cannot access the Hardware
>> Clock via any known method."
>>
>> The docs state that "some other method" may be used to calculate the
>> now value if the OS doesn't support epoch time reporting.
>>
>> Any thoughts on this?
>>
>> Garrett
>>
>> ________________________________________________________________
>> erlang-questions (at) erlang.org mailing list.
>> See http://www.erlang.org/faq.html
>> To unsubscribe; mailto:erlang-questions-unsubscribe@erlang.org
>>
>>
>

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