Re: How set CVTLSO?

On Wed, 2 Nov 2016 16:03:10 -0500, George Kozakos wrote: . >The "epoch" on z/OS systems is 1900. > . Right. It corresponds to a zeroed TOD. -- For IBM-MAIN subscribe / signoff / archive access instructions,

Re: How set CVTLSO?

On 2 November 2016 at 17:03, George Kozakos wrote: >>Not any computer systems I work with. They use either 1900 or 1970 >>as their epoch. What uses 1972? > > The "epoch" on z/OS systems is 1900. The TOD epoch is 1900. The UNIX epoch -- z/OS UNIX or any other -- is 1970.

Re: How set CVTLSO?

>Not any computer systems I work with. They use either 1900 or 1970 >as their epoch. What uses 1972? The "epoch" on z/OS systems is 1900. George Kozakos z/OS Software Service, Level 2 Supervisor -- For IBM-MAIN subscribe /

Re: How set CVTLSO?

On Tue, 1 Nov 2016 15:25:28 -0400, Tony Harminc wrote: > >And in the familiar case where the numerator is in a length unit (say, >m), and the denominator in a time unit (say, s), we have names for >each level: distance, speed, acceleration, jerk. > "jerk"? Is anyone much concerned with "jerk"

Re: How set CVTLSO?

On Tue, 1 Nov 2016 15:25:28 -0400, Tony Harminc wrote: . > >Sure - I understand what's going on. It's just that, typically, one >can "see" the nature of the units involved in such a statement. Often >enough, when some politician or news reporter makes a statement like >"Ontario

Re: How set CVTLSO?

> the units make no sense in the context That job used 5 MSUs. Charles -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Tony Harminc Sent: Tuesday, November 01, 2016 12:25 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How set CVT

Re: How set CVTLSO?

On 1 November 2016 at 13:44, Giliad Wilf <00d50942efa9-dmarc-requ...@listserv.ua.edu> wrote: > On Tue, 1 Nov 2016 13:03:27 -0400, Tony Harminc wrote: >>I'm a little confused about what kind of units "1.4 milliseconds a day >>per century" would be in. >> >>Tony H. >> > This

Re: How set CVTLSO?

On Tue, 1 Nov 2016 13:03:27 -0400, Tony Harminc wrote: . > >I'm a little confused about what kind of units "1.4 milliseconds a day >per century" would be in. > >Tony H. > This means that every 100 years, the day gets about 1.4 thousandths of a second longer, compared to the

Re: How set CVTLSO?

On Tue, 1 Nov 2016 13:03:27 -0400, Tony Harminc wrote: > >I'm a little confused about what kind of units "1.4 milliseconds a day >per century" would be in. > Does this help?: 530 $ units 500 units, 54 prefixes You have: 1.4 msec / day / century You want: Hz * 5.1347535e-18 /

Re: How set CVTLSO?

On 31 October 2016 at 09:04, Giliad Wilf <00d50942efa9-dmarc-requ...@listserv.ua.edu> wrote: > Atomic clock ticks at an absolutely constant rate of some 9192631770 > oscillations > per second (Cesium-133 atom oscillating between two energy ground levels), > while Earth sidereal day gets

Re: How set CVTLSO?

On Mon, 31 Oct 2016 10:37:14 -0500, Paul Gilmartin wrote: . >Similarly, when Daylight Saving Time ends (next week) we "add" ond hour >to our civil time clocks in the sense that that day will be 25 hours long >rather than the ordinary 24, by replicating the hour

Re: How set CVTLSO?

On Mon, 31 Oct 2016 08:04:31 -0500, Giliad Wilf wrote: >. >Why do we have to add CVTLDTO (which could be negative if East of GMT), but >subtract CVTLSO? >Because CVTLSO represents by how much TAI is greater than Earth time, and >ETS probably feeds you TAI values. > Whereas CVTLDTO represents how

Re: How set CVTLSO?

On Tue, 11 Oct 2016 12:59:47 -0500, Paul Gilmartin wrote: . > >It's not clear why the convention is to add CVTLDTO to ETOD but subtract >CVTLSO... > . Why do we have to add CVTLDTO (which could be negative if East of GMT), but subtract CVTLSO? Because CVTLSO represents by

Re: How set CVTLSO?

On 12/10/2016 07:53 PM, Paul Gilmartin wrote: > I understand that the TOD clock continues to be updated during that spin. > Are processes otherwise quiesced or may they continue to execute until > they do (e.g.) STCK? > > What happens to the clock comparator and to other STIMER-queued events? >

Re: How set CVTLSO?

On Wed, 12 Oct 2016 18:52:09 -0400, George Kozakos wrote: > >z/OS does not affect the hardware TOD clock. If the leap second change is >positive, Timer processing spins on all CPUs for the amount of the leap >second change and CVTLSO is updated. STCK time does not change but UTC/GMT >jumps

Re: How set CVTLSO?

Got it! Thanks much. Charles -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of George Kozakos Sent: Wednesday, October 12, 2016 3:52 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How set CVTLSO? On 12/10/2016 05:45:48 PM, , Charles

Re: How set CVTLSO?

On 12/10/2016 05:45:48 PM, , Charles Mills wrote: > @George, thanks. I'm looking at the from a software development point of > view, not a sysprog point of view. > > So if a shop is using an ETS and does not schedule the change then the TOD > clock will be steered into reflecting the leap seconds,

Re: How set CVTLSO?

On 2016-10-12 15:45, Charles Mills wrote: > @George, thanks. I'm looking at the from a software development point of > view, not a sysprog point of view. > > So if a shop is using an ETS and does not schedule the change then the TOD > clock will be steered into reflecting the leap seconds, right?

Re: How set CVTLSO?

o:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of George Kozakos Sent: Wednesday, October 12, 2016 1:29 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How set CVTLSO? > Ah! I am starting to understand. Leap Second steering is accomplished with > the PTFF instruction and is independent of CVTLSO. PTFF appears

Re: How set CVTLSO?

> Ah! I am starting to understand. Leap Second steering is accomplished with > the PTFF instruction and is independent of CVTLSO. PTFF appears to slow down > the physical clock. > > So ... steering and CVTLSO are essentially alternatives, right? CVTLSO > should not include any leap seconds that

Re: How set CVTLSO?

> Mostly a curiosity and "long-term" question: where do you set the leap > second offset? Can it be set without an IPL? > > I searched System Commands for "leap" and did not find anything. > > Charles Via STP or Sysplex Timer Regards, George Kozakos z/OS Software Service, Level 2 Supervisor

Re: How set CVTLSO?

On Tue, 11 Oct 2016 10:39:20 -0700, Charles Mills wrote: >Ah! I am starting to understand. Leap Second steering is accomplished with >the PTFF instruction and is independent of CVTLSO. PTFF appears to slow down >the physical clock. > >So ... steering and CVTLSO are essentially alternatives,

Re: How set CVTLSO?

ERV.UA.EDU] On Behalf Of Charles Mills Sent: Tuesday, October 11, 2016 9:00 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How set CVTLSO? *Somebody* sets it ... who and how? Charles -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of M

Re: How set CVTLSO?

On Tue, 11 Oct 2016 12:13:16 -0400, Mark Jacobs wrote: >CVTLSO is all zero on our system, and we're using STP. > According to that white paper, it depends on how the HMC is configured. A number of shops choose to set CVTLSO=0 and ignore leap seconds (the "stering" option) because a

Re: How set CVTLSO?

On Tue, 11 Oct 2016 08:43:46 -0700, Charles Mills wrote: >Okay, I read the paper. Good paper. Thanks. (I don't feel too bad -- the >paper only came out a couple of months ago.) > It's hardly automatic; according to the reference: Lastly, through the Hardware Management

Re: How set CVTLSO?

ber 11, 2016 at 12:00 PM *Somebody* sets it ... who and how? Charles -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Mark Jacobs - Listserv Sent: Tuesday, October 11, 2016 8:48 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How set CVTL

Re: How set CVTLSO?

*Somebody* sets it ... who and how? Charles -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Mark Jacobs - Listserv Sent: Tuesday, October 11, 2016 8:48 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How set CVTLSO? I don't think

Re: How set CVTLSO?

siness as usual for a while -- repeat as necessary for seven hours"? Charles -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Mark Jacobs - Listserv Sent: Tuesday, October 11, 2016 7:21 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re:

Re: How set CVTLSO?

.UA.EDU] On Behalf Of Mark Jacobs - Listserv Sent: Tuesday, October 11, 2016 7:21 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How set CVTLSO? STP will recognize that a leap second has occurred, and slowly steer zOS time to the actual time. Here's a good writeup on the process. https://www-0

Re: How set CVTLSO?

n fact change without an IPL? That is really the core of my curiosity. Charles -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Mark Jacobs - Listserv Sent: Tuesday, October 11, 2016 6:45 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: H

Re: How set CVTLSO?

Subject: Re: How set CVTLSO? I believe that if you're using STP to control system time, it all happens automagically. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu

Re: How set CVTLSO?

I believe that if you're using STP to control system time, it all happens automagically. Charles Mills October 11, 2016 at 9:42 AM Mostly a curiosity and "long-term" question: where do you set the leap second offset? Can it be set without an IPL? I searched System