 09 Nov 2021, Francesco Renga, Forum, Issue in data writing speed
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Dear all,
I've a frontend writing a quite big bunch of data into a MIDAS bank (16bit output from a 4MP photo camera).
I'm experiencing a writing speed problem that I don't understand. When the photo camera is triggered at a low rate (< 2 Hz)
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 10 Nov 2021, Stefan Ritt, Forum, Issue in data writing speed
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Midas uses various buffers (in the frontend, at the server side before the SYSTEM buffer, the SYSTEM buffer itself, on the
logger before writing to disk. All these buffers are in RAM and have fast access, so you can fill them pretty quickly. When
they are full, the logger writes to disk, which is slower. So I believe at 2 Hz your disk can keep up with your writing
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26 Jan 2022, Konstantin Olchanski, Forum, Issue in data writing speed
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Francesco, when you say "writing an event is slow", do you mean it in the frontend
or in the output data file?
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26 Jan 2022, Konstantin Olchanski, Forum, Issue in data writing speed
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> Francesco, when you say "writing an event is slow", do you mean it in the frontend
> or in the output data file?
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24 Nov 2020, Isaac Labrie Boulay, Forum, Invalid name "Analyzer/Tests"
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Hi everyone,
I've recently took the analyzer template from $MIDASSYS/examples/experiment and
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27 Nov 2020, Konstantin Olchanski, Forum, Invalid name "Analyzer/Tests"
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> I've recently took the analyzer template from $MIDASSYS/examples/experiment and
> modified it to be able to use Roody on a very simple frontend setup.
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27 Nov 2020, Konstantin Olchanski, Forum, Invalid name "Analyzer/Tests"
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https://bitbucket.org/tmidas/midas/issues/298/invalid-odb-names-in-example-midas
K.O. |
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07 Dec 2020, Isaac Labrie Boulay, Forum, Invalid name "Analyzer/Tests"
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> https://bitbucket.org/tmidas/midas/issues/298/invalid-odb-names-in-example-midas
> K.O.
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03 Oct 2004, Stefan Ritt, Info, Introduction of new transition scheme
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A new transition scheme has been implemented and committed. Previously, one had the
possibility to register for PRE/POST transitions, which was necessary in order to first
stop the frontends, then stop the logger to close the data file. While this scheme
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09 Jul 2004, Stefan Ritt, , Introduction of environment variable MIDASSYS
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Starting from midas version 1.9.4 on, the environment variable 'MIDASSYS'
should be defined and point to the installation directory of midas. The
purpose of that is that add-on packages (like the upcoming ROME system) can
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09 Jul 2004, Piotr Zolnierczuk, , Introduction of environment variable MIDASSYS
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> Starting from midas version 1.9.4 on, the environment variable 'MIDASSYS'
> should be defined and point to the installation directory of midas. The
> purpose of that is that add-on packages (like the upcoming ROME system) can
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09 Jul 2004, Stefan Ritt, , Introduction of environment variable MIDASSYS
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> Here's my suggestion
> MIDASSYS=/opt/midas-1.9.4 (for example)
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09 Jul 2004, Piotr Zolnierczuk, , Introduction of environment variable MIDASSYS
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> I guess we should follow the "standard" as much as possible. MIDASSYS was inspired by
> ROOTSYS. Now where do people usually install ROOT? Is it /opt/root-x.x.x or something
> else. Some years ago (when I did the last time some linux administration) optional
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09 Jul 2004, John M O'Donnell, , Introduction of environment variable MIDASSYS
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For a long time the "de facto" standard was to spread a package around in many
directories under /usr/local. This proved to be a bad idea, as removing the
package
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12 Jul 2004, Stefan Ritt, , Introduction of environment variable MIDASSYS
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> With POSIX there is a written standard, which says that each pacakge goes in
> it's own
> directory under /opt. eg. /opt/midas. Each package gets to define it's own
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20 Jul 2004, Konstantin Olchanski, , Introduction of environment variable MIDASSYS
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> > Starting from midas version 1.9.4 on, the environment variable 'MIDASSYS' ...
> 2. What will the entire structure tree look like?
>
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21 Jul 2004, Stefan Ritt, , Introduction of environment variable MIDASSYS
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> Where should MIDAS be installed?
I personally don't have any preference, as long as it's in accordance with "the standard"
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06 Sep 2007, Stefan Ritt, Info, Introduction of MIDAS_MAX_EVENT_SIZE
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We had the problem that different experiments used different MAX_EVENT_SIZE
values (the MEG experiment actually 10 MB!). If each experiment changes the
value in midas.h and accidentally commits it, other experiments are affected.
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10 Apr 2007, Dan Gastler, Forum, Interrupt code for VME?
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Hello,
Is there any example code for using midas for interrupt driven data
collection over VME? I am using a Struck SIS3100 PCI/VME setup to connect to my
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24 Aug 2018, Lukas Gerritzen, 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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