 16 Feb 2011, Konstantin Olchanski, Info, Notes on MIDAS history
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Some notes on the MIDAS history.
MIDAS documentation at
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 16 Feb 2011, Konstantin Olchanski, Info, Notes on MIDAS history
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>
> 1) PerVariableHistory.
>
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28 Feb 2011, Konstantin Olchanski, Info, javascript example experiment 
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I just committed a MIDAS example for using most mhttpd html and javascript functions: ODBGet(),
ODBSet(), ODBRpc() & co.
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20 Jun 2011, Stefan Ritt, Info, Javascript ODB interface revised
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The Javascript interface to the ODB has been revised. This extends the capabilities of custom web pages requesting data from the ODB. By grouping several
request together, the number of round-trips is minimized and the response time is reduced. Following functions are new or extended:
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21 Jun 2011, Stefan Ritt, Info, New MIDAS sequencer
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A new sequencer for starting and stopping runs has been implemented. Although it is till kind of in a preliminary phase, it is usable, so I would like to
share the syntax with you.
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27 Jun 2011, Konstantin Olchanski, Info, updated mhttpd history "export" function
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The mhttpd history "export" function has been converted to the new midas history
interface and should now work for SQL-based history systems. In the process,
improvements by Eoin Butler (CERN AD-5/ALPHA) were merged - adding a UNIX
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27 Jun 2011, Konstantin Olchanski, Info, midas shared memory changes
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A number of changes were made to the midas shared memory implementation for
Linux and MacOS:
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27 Jun 2011, Konstantin Olchanski, Info, mlogger lock for runNNN.mid.gz files
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By popular request, Stefan R. implemented a locking scheme for mlogger output files.
To use this function, set the mlogger ODB /Logger/Channels/NNN/Settings/Filename
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05 Jul 2011, Konstantin Olchanski, Info, midas shared memory changes
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> 2) the shared memory type used by an experiment is recorded in the file .SHM_TYPE.TXT.
An error with creating the file .SHM_TYPE.TXT was corrected in system.c svn rev 5125 - if file did not exist, it is
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11 Jul 2011, Konstantin Olchanski, Info, Make "STOP" run transition always succeed
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Over the years, there was some back-and-forth changes in what happens to run transitions when some
of the participants misbehave (do not respond to RPC calls, timeout, crash, etc).
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30 Jan 2012, Stefan Ritt, Info, IEEE Real Time 2012 Call for Abstracts
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Hello,
I'm co-organizing the upcoming Real Time Conference, which covers also the field of data acquisition, so it might be interesting for people working
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20 Jun 2012, Konstantin Olchanski, Info, lazylogger write to HADOOP HDFS
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I tried using the lazylogger "Disk" method to write into a HADOOP HDFS clustered filesystem and found a
number of problems. I ended up replacing the lazylogger lazy_copy() function that still uses former YBOS
code with a new lazy_disk_copy() function that uses generic fread/fwrite. Also fixed the situation where
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20 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks
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I am recording here the results from a test VME system using two VF48 waveform digitizers and a 64-bit
dual-core VME processor (V7865). VF48 data suppression is off, VF48 modules set to read 48 channels,
1000 ADC samples each. mlogger data compression is enabled (gzip -1).
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20 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks
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> I am recording here the results from a test VME system using two VF48 waveform digitizers
Note 1: data compression is about 89% (hence "data to disk" rate is much smaller than the "data from VME" rate)
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21 Jun 2012, Stefan Ritt, Info, midas vme benchmarks
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Just for completeness: Attached is the VME transfer speed I get with the SIS3100/SIS1100 interface using
2eVME transfer. This curve can be explained exactly with an overhead of 125 us per DMA transfer and a
continuous link speed of 83 MB/sec. |
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21 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks
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> Just for completeness: Attached is the VME transfer speed I get with the SIS3100/SIS1100 interface using
> 2eVME transfer. This curve can be explained exactly with an overhead of 125 us per DMA transfer and a
> continuous link speed of 83 MB/sec.
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22 Jun 2012, Stefan Ritt, Info, midas vme benchmarks
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> > Just for completeness: Attached is the VME transfer speed I get with the SIS3100/SIS1100 interface using
> > 2eVME transfer. This curve can be explained exactly with an overhead of 125 us per DMA transfer and a
> > continuous link speed of 83 MB/sec.
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22 Jun 2012, Zisis Papandreou, Info, adding 2nd ADC and TDC to crate
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Hi folks:
we've been running midas-1.9.5 for a few years here at Regina. We are now
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24 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks
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> > > Just for completeness: Attached is the VME transfer speed I get with the SIS3100/SIS1100 interface using
> > > 2eVME transfer. This curve can be explained exactly with an overhead of 125 us per DMA transfer and a
> > > continuous link speed of 83 MB/sec.
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24 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks
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> > I am recording here the results from a test VME system using two VF48 waveform digitizers
(I now have 4 VF48 waveform digitizers, so the event rates are half of those reported before. Date rate
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