 21 Jul 2019, Konstantin Olchanski, Info, error handling is hard
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Happy summer to everybody.
When programming in general, and when programming MIDAS, there is always a struggle
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08 Aug 2019, Konstantin Olchanski, Info, c++11 for RHEL/SL/CentOS-6
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The default el6 (RHEL/SL/CentOS-6) compiler is gcc-4.4.7, it does not support c++11, not even a little bit.
Do this to install newer c++ compilers and build MIDAS with c++11:
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08 Aug 2019, Konstantin Olchanski, Info, MIDAS will use C++11
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After much discussion, and following the MIDAS workshop at TRIUMF, we made the decision to use C++11 in MIDAS.
There are many benefits, and only one drawback - no c++11 compilers in the default OS install on older computers (i.e.
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 08 Aug 2019, Konstantin Olchanski, Suggestion, midas cmake migration
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> Each CMakeLists.txt should specify which version of CMake it requires. The MIDAS CMakeLists.txt requires CMake 3.1 or later.
> We deliberately stayed away from fancy cutting edge CMake features in order to make midas easier to compile. On top of that,
> midas is a much simpler package compared to root, so things are not so complicated.
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08 Aug 2019, Konstantin Olchanski, Bug Report, ROOTANA bug?
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> indnerlt:rootana lindner$ git diff libMidasInterface/TMidasOnline.cxx
> diff --git a/libMidasInterface/TMidasOnline.cxx b/libMidasInterface/TMidasOnline.cxx
> index 92eb3e9..67da613 100644
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09 Aug 2019, Konstantin Olchanski, Info, Precedence of equipment/common structure
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> Today I fixed a long-annoying problem. ...
> /Equipment/<name>/Common
> In the past, the ODB setting took precedence over the frontend structure...
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09 Aug 2019, Konstantin Olchanski, Bug Report, Fetest History Plot
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> Hi, our logger was running.
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09 Aug 2019, Konstantin Olchanski, Bug Report, Fetest History Plot
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> Hi, our logger was running.
Please do these simple tests:
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09 Aug 2019, Konstantin Olchanski, Forum, How to convert C midas frontends to C++
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> How do I solve mismatched declarations in the mfe (or other places in the midas code)?
I run into such problems all the time. My solution? I grep for the function name in my code and in the header file,
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14 Aug 2019, Konstantin Olchanski, Bug Fix, incorrect recursion in ss_suspend() via the user event handler
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The ROOTANA midas analyzer uncovered a problem with recursive use of ss_suspend().
When running in graphical mode, the ROOT graphics main event loop was calling
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14 Aug 2019, Konstantin Olchanski, Bug Report, ROOTANA bug?
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> - ss_suspend_set_dispatch_ipc(NULL);
> + // ss_suspend_set_dispatch_ipc(NULL);
>
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16 Sep 2019, Konstantin Olchanski, Forum, Open a hotlink to a single element in an ODB array
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> Is it possible to open a hotlink to a single element in an ODB array?
Not possible.
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16 Sep 2019, Konstantin Olchanski, Bug Report, https redirect and ODB access
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> I'm not sure if these issues are related or not, but I'm getting an error
> message when I want to access the root of the ODB via the webserver:
> [mhttpd,ERROR] [mhttpd.cxx:563:rread,ERROR] Cannot read file '/root', read of
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16 Sep 2019, Konstantin Olchanski, Info, New history plot facility
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> I see currently quite often is the error hs_read_arraybuffer (see the
attachement).
> Are there ways to get a log which would document where the problems
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16 Sep 2019, Konstantin Olchanski, Info, New history plot facility
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> During my visit at TRIUMF we rewrote the history plotting functionality of midas.
This is a most amazing achievement. We wanted to do this "for years" and I think we have
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16 Sep 2019, Konstantin Olchanski, Forum, History plot problems for frontend with multiple indicies
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> My first question would be why are you using several font-ends at all? That makes things more
> complicated than needed. In the normal FE framework, you can define either several equipment
> served by one frontend, or even one equipment linked to several devices.
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16 Sep 2019, Konstantin Olchanski, Forum, History plot problems for frontend with multiple indicies
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> it's probably better to run a multi-threaded setup, than individual frontends.
I recommend against using multiple threads if at all possible and unless absolutely required.
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16 Sep 2019, Konstantin Olchanski, Forum, History plot problems for frontend with multiple indicies
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> thanks for your reply. I can confirm that your suggested workaround does indeed
> make the problem dissapear.
> I guess this issue hasn't been seen at T2K since we use MYSQL for the history.
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17 Sep 2019, Konstantin Olchanski, Info, New history plot facility
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> > On the mhttpd side, please capture the stack trace from the crash
>
> here comes the stack trace (only happens when using safari 12.1.2 macOS 10.14.6):
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17 Sep 2019, Konstantin Olchanski, Forum, History plot problems for frontend with multiple indicies
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> [local:e666:S]History>ls -l /History/Events
> Key name Type #Val Size Last Opn Mode Value
> ---------------------------------------------------------------------------
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