 10 Aug 2012, Carl Blaksley, Forum, Problem with CAMAC controlled by CES8210 and read out by CAEN V1718 VME controller
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Hello all,
I am trying to put together a system to read out several camac adc. The camac is
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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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04 Jul 2012, Konstantin Olchanski, Bug Report, Crash after recursive use of rpc_execute()
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I am looking at a MIDAS kaboom when running out of space on the data disk - everything was freezing
up, even the VME frontend crashed sometimes.
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04 Jul 2012, Konstantin Olchanski, Bug Report, Crash after recursive use of rpc_execute()
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> ... I see a recursive call to rpc_execute(): rpc_execute() calls tr_stop() calls cm_yield() calls
> ss_suspend() calls rpc_execute()
> ... rpc_execute() cannot be called recursively - it is not re-entrant as it uses a global buffer
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13 Jul 2012, Stefan Ritt, Bug Report, Crash after recursive use of rpc_execute()
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> Then I realized that I see a recursive call to rpc_execute(): rpc_execute() calls tr_stop() calls cm_yield() calls
> ss_suspend() calls rpc_execute(). The second rpc_execute successfully completes, but leave corrupted
> data for the original rpc_execute(), which happily crashes. At the moment of the crash, recursive call to
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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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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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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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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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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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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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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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13 Jun 2012, Exaos Lee, Bug Report, Cannot start/stop run through mhttpd
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Revision: r5286
Platform: Debian Linux 6.0.5 AMD64, with packages from squeeze-backports
Problem:
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13 Jun 2012, Konstantin Olchanski, Bug Report, Cannot start/stop run through mhttpd
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> Revision: r5286
> Platform: Debian Linux 6.0.5 AMD64, with packages from squeeze-backports
> Problem:
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13 Jun 2012, Exaos Lee, Bug Report, Cannot start/stop run through mhttpd
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> Well, it's mhttpd who cannot start the run, not you. So what happens when you press
> the "start run" button? Any errors in midas.log or in midas messages? Is mtransition
> in your PATH?
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14 Jun 2012, Exaos Lee, Bug Report, Cannot start/stop run through mhttpd
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> > Revision: r5286
> > Platform: Debian Linux 6.0.5 AMD64, with packages from squeeze-backports
> > Problem:
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14 Jun 2012, Stefan Ritt, Bug Report, Cannot start/stop run through mhttpd
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> I found the problem only appears when I run mhttpd in scripts, whether bash or python.
> And I'm quite sure that the MIDAS environments (e.g. PATH, MIDAS_EXPTAB, MIDASSYS, etc.)
> are set in such scripts. If I start mhttpd in an xterm with or without "-D", it works
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14 Jun 2012, Konstantin Olchanski, Bug Report, Cannot start/stop run through mhttpd
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> > I found the problem only appears when I run mhttpd in scripts, whether bash or python.
> > And I'm quite sure that the MIDAS environments (e.g. PATH, MIDAS_EXPTAB, MIDASSYS, etc.)
> > are set in such scripts. If I start mhttpd in an xterm with or without "-D", it works
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21 Jun 2012, Stefan Ritt, Bug Report, Cannot start/stop run through mhttpd
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> I agree. Somehow mhttpd cannot run mtransition. I am not super happy with this dependance on user $PATH settings and the inability to capture error messages
> from attempts to start mtransition. I am now thinking in the direction of running mtransition code by forking. But remember that mlogger and the event |
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14 Jun 2012, Konstantin Olchanski, Bug Report, Cannot start/stop run through mhttpd
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> > > Revision: r5286
> > > Platform: Debian Linux 6.0.5 AMD64, with packages from squeeze-backports
>
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09 Jun 2012, Greg Christian, Bug Report, _net_send_buffer realloc
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In midas.c, I noticed that memory is only allocated to the global buffer
_net_send_buffer by calling realloc() from within the function
resize_net_send_buffer() (at least this was the only place I could find
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10 Jun 2012, Konstantin Olchanski, Bug Report, _net_send_buffer realloc
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> In midas.c, ...
>
> 1) _net_send_buffer is not set to NULL when declared.
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10 Jun 2012, Greg Christian, Bug Report, _net_send_buffer realloc
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> > In midas.c, ...
> >
> > 1) _net_send_buffer is not set to NULL when declared.
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11 Jun 2012, Konstantin Olchanski, Bug Report, _net_send_buffer realloc
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> > > In midas.c, ...
> > >
> > > 1) _net_send_buffer is not set to NULL when declared.
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15 Jun 2012, Konstantin Olchanski, Bug Report, _net_send_buffer realloc
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> 2) cm_disconect_experiment() calls free(_net_send_buffer) but does not set its
> value to NULL.
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12 Dec 2011, Michael Murray, Bug Report, bk_delete uses memcpy instead of memmove
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In midas.c, the bk_delete function removes a bank by decrementing the total
event size and then copying the remaining banks into the location of the first
using memcpy from string.h.
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16 Dec 2011, Konstantin Olchanski, Bug Report, bk_delete uses memcpy instead of memmove
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> In midas.c, the bk_delete function removes a bank by decrementing the total
> event size and then copying the remaining banks into the location of the first
> using memcpy from string.h.
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19 Dec 2011, Stefan Ritt, Bug Report, bk_delete uses memcpy instead of memmove
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> > In midas.c, the bk_delete function removes a bank by decrementing the total
> > event size and then copying the remaining banks into the location of the first
> > using memcpy from string.h.
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15 Jun 2012, Konstantin Olchanski, Bug Report, bk_delete uses memcpy instead of memmove
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> In midas.c, the bk_delete function removes a bank by decrementing the total
> event size and then copying the remaining banks into the location of the first
> using memcpy from string.h.
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13 Jun 2012, Konstantin Olchanski, Forum, ladd00.triumf.ca https ssl certificate update
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The HTTPS SSL certificate on ladd00.triumf.ca has been updated. Same as the old
certificate, the new one is self-signed and your web browser may complain about
that and ask you to "save a security exception".
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18 Apr 2012, Exaos Lee, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’
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I tried to build MIDAS under ArchLinux, failed on errors as following:
[CODE]src/mlogger.cxx: In function ‘INT midas_flush_buffer(LOG_CHN*)’:
src/mlogger.cxx:1011:54: error: invalid conversion from ‘void*’ to ‘gzFile’ [-fpermissive]
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19 Apr 2012, Stefan Ritt, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’
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[quote="Exaos Lee"]I tried to build MIDAS under ArchLinux, failed on errors as following:
[CODE]src/mlogger.cxx: In function ‘INT midas_flush_buffer(LOG_CHN*)’:
src/mlogger.cxx:1011:54: error: invalid conversion from ‘void*’ to ‘gzFile’ [-fpermissive]
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25 Apr 2012, Konstantin Olchanski, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’
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Stefan's fix is incomplete - the "gzFile" cast is needed for all calls to zlib, not just those that some version
of GCC happens to complain about. Fixed.
svn rev 5286.
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27 Apr 2012, Stefan Ritt, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’
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[quote="KO]BTW, I read the midas elog via email and if you post html or elcode messages, I receive complete
gibberish. For prompt service, please select message type "plain". (yes, you cannot use fancy colours and
blinking text, but better than me not reading your stuff at all).
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29 Feb 2012, Konstantin Olchanski, Bug Report, Problem with semaphores
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Hi there! In the T2K/ND280 experiment in Japan, we keep having problems with MIDAS locking (probably
of ODB). The symptoms are: some program reports a timeout waiting for the ODB lock, then all programs
eventually die with this same error. Complete system meltdown. This does not look like the deadlock
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01 Mar 2012, Stefan Ritt, Bug Report, Problem with semaphores
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> Anyhow, if anybody can suggest such an advanced locking library it would be great. Will save me the
> effort of writing one.
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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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05 Sep 2011, John McMillan, Forum, khyt1331 under scientific linux 5.5?
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Hello,
I'm trying to build khyt1331 under scientific linux 5.5, kernel
2.6.18-238.9.1el5. Has anyone succeeded with this. So far, I've
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25 Aug 2011, Francesco Prelz, Forum, 64-bit integer support in MIDAS
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Hi,
I've been doing some preliminary work to use at least the MIDAS
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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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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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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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10 Jul 2011, Konstantin Olchanski, Bug Fix, 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.
> > 3) the hostname of the computer where the ODB shared memory is meant to reside is now
> > recorded in the file .SHM_HOST.TXT.
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11 Jul 2011, Konstantin Olchanski, Bug Fix, 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.
> > > 3) the hostname of the computer where the ODB shared memory is meant to reside is now
> > > recorded in the file .SHM_HOST.TXT.
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05 Jul 2011, Konstantin Olchanski, Bug Report, MacOS network socket timeouts non-functional
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It turns out that because of differences between select() syscall implementation between UNIX (MacOS,
maybe BSD) and Linux, network socket timeouts do not work.
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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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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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