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<== Date ==> <== Thread ==>

Subject: Re: question about Channel Archiver
From: Thomas Birke <[email protected]>
To: huangsong <[email protected]>
Cc: [email protected]
Date: Thu, 23 Jun 2005 12:22:04 +0200
huangsong wrote:

Thanks for reply.

The 'data'command print the correct time.
My Host is running Linux 9.0, TZ isn't defined. After I defined it, there has no effect for the problem.


Yes, EPICS_TS_MIN_WEST is used to convert the timestamps of the exported data.
But what will effect the start time?


Since you are running a slightly old version of the ChannelArchiver I unfortunately cannot reproduce your problem, but:

The ChannelArchiver uses (and used to utilize) the functions provided by the EPICS-Base to do the conversion of timestamps
* locattime <-> UTC (or whatever EPICS's base-timezone is)
* and in the older versions even to convert timestamp <-> string


Nevertheless, in your case, it looks like the timestamp you provide on the command-line is always taken as a UTC-timestamp.
This is definitely not the expected behaviour! And I don't have the sources of ChannelArchiver 1.10.2 at hand to look/try it.
I just found an old HP-UX-binary of ArchiveExport (version 1.9.2) compiled against EPICS-base 3.13.5 and while playing with the environment (setting EPICS_TS_MIN_WEST and/or TZ to different values) unfortunately does not show the behaviour you observe!
Indeed it behaves well - it uses EPICS_TS_MIN_WEST to parse the command-line-arguments and to print the timestamps for the output. So the timestamps printed are always in the range of what I specified on the command-line. TZ has no influence at all.


EPICS_TS_MIN_WEST=-480
./hp700-1.9.2/ArchiveExport -start '01/06/04 02:00:00' -end '01/06/04 02:01:00' directory MDIZ3T5G:current
...
Time MDIZ3T5G:current [mA]
01/06/2004 01:59:59.144578069 4.882
01/06/2004 02:00:09.147168847 4.860
01/06/2004 02:00:18.947919171 4.840
01/06/2004 02:00:29.101599783 3.639
01/06/2004 02:00:39.189630846 3.475
01/06/2004 02:00:48.956558186 2.622
01/06/2004 02:00:59.000995515 2.352
01/06/2004 02:01:09.201892629 1.838



EPICS_TS_MIN_WEST=-480
./hp700-1.9.2/ArchiveExport -start '01/06/04 02:00:00' -end '01/06/04 02:01:00' directory MDIZ3T5G:current
...
Time MDIZ3T5G:current [mA]
01/06/2004 01:59:59.797524861 -0.152
01/06/2004 02:00:09.696648741 -0.150
01/06/2004 02:00:19.558158965 -0.153
01/06/2004 02:00:29.772687281 -0.152
01/06/2004 02:00:39.739121581 -0.154
01/06/2004 02:00:49.566553625 -0.154
01/06/2004 02:00:59.764922136 -0.154
01/06/2004 02:01:09.797810589 -0.156


So, sorry, no help actually, just a description of how it "should" behave...

Regards,
Thomas

--
______________________________________________________________________
/homas.Birke @ bessy.de

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References:
question about Channel Archiver huangsong
Re: question about Channel Archiver Ralph Lange
Re: question about Channel Archiver huangsong

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