 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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25 Jun 2012, Stefan Ritt, Info, midas vme benchmarks
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> P.S. Observe the ever present unexplained event rate fluctuations between 130-140 event/sec.
An important aspect of optimizing your system is to keep the network traffic under control. I use GBit Ethernet between FE and BE, and make sure the switch |
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25 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks
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> > P.S. Observe the ever present unexplained event rate fluctuations between 130-140 event/sec.
>
> An important aspect of optimizing your system is to keep the network traffic under control. I use GBit Ethernet between FE and BE, and make sure the |
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26 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks
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> > > I am recording here the results from a test VME system using four VF48 waveform digitizers
Now we look at the detail of the event readout, or if you want, the real-time properties of the MIDAS
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26 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks
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> > > > I am recording here the results from a test VME system using four VF48
waveform digitizers
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29 Jun 2012, Konstantin Olchanski, Info, lazylogger write to HADOOP HDFS
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> Anyhow, the new lazylogger writes into HDFS just fine and I expect that it would also work for writing into
> DCACHE using PNFS (if ever we get the SL6 PNFS working with our DCACHE servers).
>
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27 Jul 2012, Cheng-Ju Lin, Info, MIDAS under Scientific Linux 6
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Hi All,
I was wondering if anyone has attempted to install MIDAS under Scientific Linux 6? I am planning to install
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31 Jul 2012, Pierre-Andre Amaudruz, Info, MIDAS under Scientific Linux 6
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Hi Cheng-Ju,
Midas will install and run under SL6. We're presently running SL6.2.
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05 Sep 2012, Stefan Ritt, Info, New pipe compression implemented in mlogger
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A new pipe compression has been implemented in mlogger thanks to Fedor Ignatov from BINP
Novosibirsk. The way it works that the logger write into a pipe instead directly into a file. The pipe can
then be connected to any compression program without the need to copile against any additional C
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10 Sep 2012, Shaun Mead, Info, MIDAS button to display image
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Hi,
I've written a python script that reads some data from a file and generates a
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11 Sep 2012, Stefan Ritt, Info, MIDAS button to display image
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> Hi,
>
> I've written a python script that reads some data from a file and generates a
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24 Jan 2013, Konstantin Olchanski, Info, Compression benchmarks
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In the DEAP experiment, the normal MIDAS mlogger gzip compression is not fast enough for some data
taking modes, so I am doing tests of other compression programs. Here is the results.
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06 Feb 2013, Stefan Ritt, Info, Compression benchmarks
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I redid the tests from Konstantin for our MEG experiment at PSI. The event structure is different, so it
is interesting how the two different experiments compare. We have an event size of 2.4 MB and a trigger
rate of ~10 Hz, so we produce a raw data rate of 24 MB/sec. A typical run contains 2000 events, so has a
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