 02 Dec 2021, Alexey Kalinin, Bug Report, some frontend kicked by cm_periodic_tasks
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Hello,
We have a small experiment with MIDAS based DAQ.
Status page shows :
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 26 Jan 2022, Konstantin Olchanski, Bug Report, some frontend kicked by cm_periodic_tasks
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> The problem is that eventually some of frontend closed with message
> :19:22:31.834 2021/12/02 [rootana,INFO] Client 'Sample Frontend38' on buffer
> 'SYSMSG' removed by cm_periodic_tasks because process pid 9789 does not exist
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11 Feb 2022, Alexey Kalinin, Bug Report, some frontend kicked by cm_periodic_tasks
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Thanks for the answer.
As soon as I can(possible in a month) I'll try suggestion below:
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01 Dec 2017, Frederik Wauters, Bug Report, small bug in mfe.c init
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There is a small bug in the mfe.c initialization for the EQ_POLLED mode. There
is a routine where the number of polls fitting in eq_info->period is counted:
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01 Dec 2017, Stefan Ritt, Bug Report, small bug in mfe.c init
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> There is a small bug in the mfe.c initialization for the EQ_POLLED mode. There
> is a routine where the number of polls fitting in eq_info->period is counted:
>
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04 Dec 2017, Frederik Wauters, Bug Report, small bug in mfe.c init
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> > There is a small bug in the mfe.c initialization for the EQ_POLLED mode. There
> > is a routine where the number of polls fitting in eq_info->period is counted:
> >
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04 Dec 2017, Stefan Ritt, Bug Report, small bug in mfe.c init
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> Thanks, I misunderstood the loop then. If poll_event(equipment[idx].info.source, (INT)count, TRUE); doesn`t do anything with "count", the loop becomes
infinite except for the overflow
> check.
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10 Jun 2020, Ivo Schulthess, Forum, slow-control equipment crashes when running multi-threaded on a remote machine
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Dear all
To reduce the time needed by Midas between runs, we want to change some of our periodic equipment to multi-threaded slow-control equipment. To do that |
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10 Jun 2020, Konstantin Olchanski, Forum, slow-control equipment crashes when running multi-threaded on a remote machine
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Yes, it is supposed to crash. On a remote frontend, cm_get_path() cannot be used
(we are on a different computer, all filesystems maybe no the same!) and is actually not set and
triggers a trap if something tries to use it. (this is the crash you see).
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10 Jun 2020, Stefan Ritt, Forum, slow-control equipment crashes when running multi-threaded on a remote machine
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Few comments:
- As KO write, we might need semaphores also on a remote front-end, in case several programs share the same hardware. So it should work and cm_get_path() |
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12 Jun 2020, Ivo Schulthess, Forum, slow-control equipment crashes when running multi-threaded on a remote machine
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Thanks you two once again for the very fast answers. I tested the example on the local machine and it works perfectly fine. In the meantime I also created
two new drivers for our devices
and everything works with them, the improvement in time is significant and I will create drivers for all our devices where possible. If they are in a working |
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10 Jan 2024, Pavel Murat, Forum, slow control frontends - how much do they sleep and how often their drivers are called?
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Dear all,
I have implemented a number of slow control frontends which are directed to update the
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11 Jan 2024, Stefan Ritt, Forum, slow control frontends - how much do they sleep and how often their drivers are called?
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Put a
ss_sleep(10);
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11 Jan 2024, Pavel Murat, Forum, slow control frontends - how much do they sleep and how often their drivers are called?
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Hi Stefan, thanks a lot !
I just thought that for the EQ_SLOW type equipment calls to sleep() could be hidden in mfe.cxx
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12 Jan 2024, Stefan Ritt, Forum, slow control frontends - how much do they sleep and how often their drivers are called?
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> Hi Stefan, thanks a lot !
>
> I just thought that for the EQ_SLOW type equipment calls to sleep() could be hidden in mfe.cxx
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28 Jan 2024, Konstantin Olchanski, Forum, slow control frontends - how much do they sleep and how often their drivers are called?
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> I have implemented a number of slow control frontends which are directed to update the
> history once in every 10 sec, and they do just that.
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10 May 2011, Jianglai Liu, Forum, simple example frontend for V1720
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Hi,
Who has a good example of a frontend program using CAEN V1718 VME-USB bridge and
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10 May 2011, Stefan Ritt, Forum, simple example frontend for V1720
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[quote="Jianglai Liu"]Hi,
Who has a good example of a frontend program using CAEN V1718 VME-USB bridge and
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10 May 2011, Pierre-Andre Amaudruz, Forum, simple example frontend for V1720
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[quote="Jianglai Liu"]Hi,
Who has a good example of a frontend program using CAEN V1718 VME-USB bridge and
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18 May 2011, Jimmy Ngai, Forum, simple example frontend for V1720 
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[quote="Jianglai Liu"]Hi,
Who has a good example of a frontend program using CAEN V1718 VME-USB bridge and
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