 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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24 May 2011, Jianglai Liu, Forum, simple example frontend for V1720
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Thanks all for the kind help. This did point me to the right direction. I was now able to make v1720.c as well as my MIDAS frontend (thanks to
Jimmy's example) talking to V1720, and read out the waveform bank.
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10 Aug 2012, Carl Blaksley, Forum, simple example frontend for V1720
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[quote="Jimmy Ngai"][quote="Jianglai Liu"]Hi,
Who has a good example of a frontend program using CAEN V1718 VME-USB bridge and
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12 Aug 2012, Jimmy Ngai, Forum, simple example frontend for V1720
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[quote="Carl Blaksley"][quote="Jimmy Ngai"][quote="Jianglai Liu"]Hi,
Who has a good example of a frontend program using CAEN V1718 VME-USB bridge and
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13 Oct 2004, Konstantin Olchanski, Bug Report, silly odbedit "rename Display xxx/yyy"
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odbedit command "rename Display xxx/yyy" creates a key named "xxx/yyy" (yes,
with a slash in the name) and this key cannot be deleted or renamed...
K.O. |
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13 Oct 2004, Stefan Ritt, Bug Report, silly odbedit "rename Display xxx/yyy"
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> odbedit command "rename Display xxx/yyy" creates a key named "xxx/yyy" (yes,
> with a slash in the name) and this key cannot be deleted or renamed...
> K.O.
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02 Mar 2021, Konstantin Olchanski, Info, shortest possible sleep
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since I am implementing a polled equipment, I was curious what is the smallest possible sleep time on current computers.
in current UNIX, there are 2 system calls available for sleeping: select() (with microsecond granularity) and nanosleep() (with nanosecond granularity).
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02 Mar 2021, Stefan Ritt, Info, shortest possible sleep
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Why do you need that? Periodic equipment typically runs ever ten seconds or so, meaning one can do this easily in a scheduler.
For polled equipment, you don't want to sleep at all. Because if you sleep, you might miss an event. That's why I put my poll in mfe.c into a for() loop. |
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03 Mar 2021, Konstantin Olchanski, Info, shortest possible sleep
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> Why do you need that?
UNIX/POSIX advertises functions for sleeping in microseconds and nanoseconds,
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05 Jul 2024, Joseph McKenna, Suggestion, shared pointers for more flexible memory managment of the analysis 'flow' and TMEvent
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> Hi all, I hope this is the right place to post two pull requests, if not, please let me know where I should be submitting them
>
> Both are fairly small changes, please see them listed below (more details written on the PRs themselves)
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20 Nov 2003, Konstantin Olchanski, , set-uid-root midas programs
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I see that MIDAS installs several set-uid-root programs into /usr/local/bin.
In this age and time of evil computer hackers, this is not a good idea and
we should Do Something (TM) about it. Here is my risk assessment:
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20 Nov 2003, Stefan Ritt, , set-uid-root midas programs
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> dio- is required to be setuid-root to gain I/O permissions. I looked at it a
> few times, and it is probably safe, but I would like to get a second
> opinion. Stephan, can you should it to your local security geeks?
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11 Feb 2013, Wes Gohn, Forum, send_tcp error
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I am getting a series of errors from MIDAS that I do not understand, so I hope
someone can help me figure this out.
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11 Feb 2013, Stefan Ritt, Forum, send_tcp error
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> I am getting a series of errors from MIDAS that I do not understand, so I hope
> someone can help me figure this out.
>
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11 Feb 2013, Wes Gohn, Forum, send_tcp error
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> > I am getting a series of errors from MIDAS that I do not understand, so I hope
> > someone can help me figure this out.
> >
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12 Feb 2013, Stefan Ritt, Forum, send_tcp error
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Ok, now the picture is clearer. I have however no idea what the real problem is. The number of concurrent programs in midas is 64 as defined in midas.h
(MAX_CLIENTS) so that should not be the problem. In our experiment we run 10 front-ends (but
on 10 different machines) without problems. Other experiments used 27 front-ends.
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