 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 |
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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 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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17 Aug 2012, Konstantin Olchanski, Bug Report, launching roody kills the analyzer
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> I've installed midas (Rev:5294) on SLC6.3 (64bit), along with recent trunk versions of rootana and roody.
>
> #6 root_server_thread (arg=ox7f54fc001150) at src/mana.c:5154
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26 Sep 2012, Konstantin Olchanski, Bug Report, launching roody kills the analyzer
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> >
> > I guess you can also debug the old midas server code inside mana.c...
> >
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13 Dec 2012, Konstantin Olchanski, Bug Report, ss_thread_kill() kills entire program
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> Hi, I'm having some trouble getting ss_thread_kill() to work properly. It seems
> to kill the entire program instead of just the thread.
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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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13 Feb 2013, Konstantin Olchanski, Info, Review of github and bitbucket
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I have done a review of github and bitbucket as candidates for hosting GIT repositories for collaborative
DAQ-type projects. Here is my impressions.
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08 Mar 2013, Konstantin Olchanski, Info, ODB /Experiment/MAX_EVENT_SIZE
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Somebody pointed out an error in the MIDAS documentation regarding maximum event size
supported by MIDAS and the MAX_EVENT_SIZE #define in midas.h.
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02 Apr 2013, Konstantin Olchanski, Info, Review of github and bitbucket
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Hi, thanks for your positive feedback. I have been using git for small private projects for a few years now
and I like it. It is similar to the old SCCS days - good version control without having to setup servers,
accounts, doodads, etc.
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05 Apr 2013, Konstantin Olchanski, Info, ODB JSON support
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odbedit can now save ODB in JSON-formatted files. (JSON is a popular data encoding standard associated
with Javascript). The intent is to eventually use the ODB JSON encoder in mhttpd to simplify passing of
ODB data to custom web pages. In mhttpd I also intend to support the JSON-P variation of JSON (via the
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11 Apr 2013, Konstantin Olchanski, Forum, Persistent ipcrm error
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> [system.c:308:ss_shm_open,ERROR] Shared memory segment with key 0x4d008002 already exists,
please remove it manually: ipcrm -M 0x4d008002
> [midas.c:1950:cm_connect_experiment1,ERROR] cannot open database
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30 Apr 2013, Konstantin Olchanski, Info, ROOT switched to GIT
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Latest news - the ROOT project switched from SVN to GIT.
Announcement:
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06 May 2013, Konstantin Olchanski, Info, Recent-ish SVN changes at PSI
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A little while ago, PSI made some changes to the SVN hosting. The main SVN URL seems to remain the
same, but SVN viewer moved to a new URL (it seems a bit faster compared to the old viewer):
https://savannah.psi.ch/viewvc/meg_midas/trunk/
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06 May 2013, Konstantin Olchanski, Info, TRIUMF MIDAS page moved to DAQWiki
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The MIDAS web page at TRIUMF (http://midas.triumf.ca) moved from the daq-plone site to the DAQWiki
(MediaWiki) site. Links were updated, checked and corrected:
https://www.triumf.info/wiki/DAQwiki/index.php/MIDAS
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07 May 2013, Konstantin Olchanski, Info, Updated: javascript custom page examples
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I updated the MIDAS javascript examples in examples/javascript1. All existing mhttpd.js functions are
now exampled. (yes).
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10 May 2013, Konstantin Olchanski, Bug Fix, Fixed: crash if alarm "write elog message" is enabled
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If the MIDAS Alarm property "write elog message" is enabled, an uninitialized variable "tag" is passed to
el_submit() and depending on your luck, cause a crash. "tag" is supposed to be and is now a NUL-
terminated string. The only other use of el_submit() is in mhttpd.cxx and mserver.c, where it is called
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