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Subject: Re: Re: Question about RDB Channel archiver engine be used for the waveform channels
From: lzf neu via Tech-talk <tech-talk@aps.anl.gov>
To: Mazanec Tomáš <Tomas.Mazanec@eli-beams.eu>, "tech-talk@aps.anl.gov" <Tech-talk@aps.anl.gov>
Date: Mon, 16 Jul 2018 10:16:28 +0000
Hi,

Thanks for your reply, I meet another peoblem.

The update rate is 10Hz, the number of element is 1360. FTVL is double.
The db I write is as follows:

record(waveform, "mytest")
{
    field(NELM, 1360)
    field(FTVL, "DOUBLE")
    field (PINI, "YES")
}

and the scan rate I set is 0.1s in XML file, I also set the batch size is 1500, write period is 10s, buffer reserve is 3 and then run ArchiveConfig and ArchiveEngine tool to acquire the waveform data and write to mysql.

however, i can see only 1 data per 0.1s in mysql record. The correct number should be 1360 data per 0.1s and 13600 data per second.

I have no idea if I miss something.
Thanks in advance.

Zhefu


From: Mazanec Tomáš<mailto:Tomas.Mazanec@eli-beams.eu>
Date: 2018-06-27 16:47
To: lzf neu<mailto:lzfneu@live.com>; tech-talk@aps.anl.gov<mailto:Tech-talk@aps.anl.gov>
Subject: Re: Question about RDB Channel archiver engine be used for the waveform channels
Hi

Yes, RDB channel archiver can store waveform data (as any other Channel Access PV data);
and users can retrieve the stored waveform data using e.g.: CSS DataBrowser (and waveform analyzer).


Answer to your 1.25GS/s requirement: If you have a HW good enough and the sampled data well partitioned into waveforms, then yes, it is possible to archive the data with use of one-or-more RDB archiver instances and with properly scaled SQL storage.

Detailed answer requires more information about how the waveforms are processed at IOC side -- in terms of their update rate, NORD, NELM, FTVL.

Tomas


________________________________
Od: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> za uživatele lzf neu <lzfneu@live.com>
Odesláno: úterý 26. června 2018 7:40:19
Komu: tech-talk@aps.anl.gov
Předmět: Question about RDB Channel archiver engine be used for the waveform channels

Hi,

I have a question to consult you.
Can RDB Channel archiver engine stores the waveform data received by channel access and then get the history data back out? The waveform data presents for the voltages samples by the beamloss with sample rate 1.25Gs/s.

Any help will be appreciated and thanks in advance.

regards,

Zhefu

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