 13 Jul 2017, Konstantin Olchanski, Info, implemented: json-rpc batch requests
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The mhttpd json-rpc interface now implements batch requests per
http://www.jsonrpc.org/specification#batch
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04 Aug 2017, Konstantin Olchanski, Info, Notes on installing midas from scratch
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Notes on installing midas from scratch. The instruction on midaswiki will be synced with this later.
cd ~/packages
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 12 Aug 2017, Konstantin Olchanski, Suggestion, Increasing Max Number of Frontends
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The checks for byte sizes of critical data structures have been added to ensure (enforce) binary compatibility
of midas with itself on different platforms (32-bit and 64-bit intel, on PPC, on ARM, etc).
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13 Aug 2017, Konstantin Olchanski, Suggestion, Increasing Max Number of Frontends
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> if (sizeof(INT) != 4) then severe_error_and_stop_all_programs()
Quick reply.
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11 Oct 2017, Konstantin Olchanski, Info, added support for ucLinux
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Support for building for ucLinux was added to MIDAS. I use the emcraft toolchain and userland on
some kind of embedded ARM CPU that does not have an MMU. See the Makefile for details. The
main difference of ucLinux is lack of fork(), which cannot be done without an MMU. Not everything
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13 Oct 2017, Konstantin Olchanski, Info, odb multithread support repaired
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multithreaded access to odb was implemented back in 2013-2014. but recently a bug surfaced -
there was a race condition in the odb locking code against cm_watchdog(). Somehow this only
affected the mserver for the DRAGON experiment at TRIUMF. This is now fixed on the branch
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02 Nov 2017, Konstantin Olchanski, Bug Fix, Fixed mlogger memory corruption, updated mxml
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I the agdaq system I see memory corruption in the mlogger. There were at least two bugs: one
memory allocation error in mxml and one incorrect memset() in mlogger.cxx. The mxml bug is fixed
in the mxml repository, mlogger.cxx bug is fixed in the midas-2017-10 branch.
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17 Nov 2017, Konstantin Olchanski, Suggestion, Feature request: Separate ODB flag to show programs on "Programs page"
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> Currently one has to set the required flag in the ODB (e.g., /Programs/Logger/Required) to "y" for the program
> to appear on the "Programs page" and being able to start and stop the program easily.
>
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17 Nov 2017, Konstantin Olchanski, Bug Report, bug in init of hv class driver
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Hi, Frederick, this is my personal opinion on the slow controls hv classes, I have
used them a couple of times and I found them full of little buglets like this,
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21 Nov 2017, Konstantin Olchanski, Bug Report, bug in init of hv class driver
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>
> The original idea behind the hv driver is that all voltages in the ODB and the class driver are
> positive. If you have a negative power supply, then the voltage is inverted at the device
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21 Nov 2017, Konstantin Olchanski, Info, MIDAS support on el5?
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It has been reported that the current midas release candidate does not build on el5 linux (SL/RHEL/CentOS-5).
According to Red Hat, el5 is end-of-life, last SL 5 (SL5.11) was done in 2014, so this linux is very old. Also as it happens, I do not have access to any |
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21 Nov 2017, Konstantin Olchanski, Release, Pending release of midas
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We are readying a new release of midas and it is almost here except for a few buglets on the new html status page.
The current release candidate branch is "feature/midas-2017-10" and if you have problems with the older versions
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11 Jan 2018, Konstantin Olchanski, Bug Report, mhttpd - custom page - RHEL/Fedora
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> [mhttpd,ERROR] [mhttpd.cxx:563:rread,ERROR] Cannot read file '/root', read of
> 4096 returned -1, errno 21 (Is a directory)
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20 Jul 2018, Konstantin Olchanski, Info, ROOT I/O workshop notable
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The ROOT I/O workshop was held on June 20th at CERN. A few things of interest in MIDAS land:
- LZ4 is now used as default compression (replacing gzip-1)
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20 Jul 2018, Konstantin Olchanski, Forum, strings in sqlite
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> Invalid tag 0 'Comment' in event 21 'Run Parameters': cannot do history for
> TID_STRING data, sorry!
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20 Jul 2018, Konstantin Olchanski, Forum, ODB full
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Concurrence.
Normally, MIDAS data events are saved to ODB (via RO_ODB into /eq/xxx/variables) to make them go into the midas history (/eq/xxx/common/history > 0).
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23 Jul 2018, Konstantin Olchanski, Forum, Question about distributing event builder function on remote PC
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> I'm going to develop MIDAS DAQ for COMET experiment.
> I'm thinking to distribute the load of event building to different PCs.
> I attach a schematics of one of the examples of the design.
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28 Aug 2018, Konstantin Olchanski, Bug Report, Deleting Links in ODB via mhttpd
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> Asume you have a variable foo and a link bar -> foo. When you go to the ODB in
> mhttpd, click "Delete" and select bar, it actually deletes foo. bar stays,
> stating "<cannot resolve link>". Trying the same in odbedit with rm gives the
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28 Aug 2018, Konstantin Olchanski, Forum, Problems with virtual history events
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Hi, what you try should have worked. Perhaps your symlink is wrong and should say "/External/..." (with a leading slash). The "links period" would have
worked same as equipment/common/history period - as a rate limiter.
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28 Aug 2018, Konstantin Olchanski, Forum, Int64 datatype
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> I would like to store the address of 1-Wire temperature sensors in a device
> driver. However, the supportet data types (as definded around
> include/midas.h:311) do not foresee a type large enough.
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