 30 Mar 2011, Exaos Lee, Forum, How large does "bank32" support?
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Reading an FADC buffer often needs large buffer size, especially while several
FADCs work together. I want to know how large a bank32 can support. |
 30 Mar 2011, Stefan Ritt, Forum, How large does "bank32" support?
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> Reading an FADC buffer often needs large buffer size, especially while several
> FADCs work together. I want to know how large a bank32 can support.
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15 Apr 2011, Konstantin Olchanski, Forum, How large does "bank32" support?
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> Reading an FADC buffer often needs large buffer size, especially while several
> FADCs work together. I want to know how large a bank32 can support.
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15 Apr 2011, Jonathan Toebbe, Forum, Can't get example frontend to talk to khyt1331 kernel driver
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I'm brand new to MIDAS, and C system programming in general, so please be
gentle. I've compiled and installed MIDAS 2.3.0 on Ubuntu 10.04 LTS. I've built
the kernel driver, khyt1331.ko and installed it. It appears to be working, since
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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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17 Jan 2011, Andreas Suter, Bug Report, Problems with midas history SVN 4936
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I have the following problems after updating to midas SVN 4936: the history
system (web-page via mhttpd) seems to stop working. I checked the history files
themself and they are indeed written, except that the events ID's are not the
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13 Feb 2011, Lee Pool, Bug Report, Problems with midas history SVN 4936
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> I have the following problems after updating to midas SVN 4936: the history
> system (web-page via mhttpd) seems to stop working. I checked the history files
> themself and they are indeed written, except that the events ID's are not the
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16 Feb 2011, Konstantin Olchanski, Bug Report, Problems with midas history SVN 4936
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>
> Do you mind giving little more detail? We might have the same issue, where we got
> complaints that midas history stops working after a certain time.
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16 Feb 2011, Lee Pool, Bug Report, Problems with midas history SVN 4936
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> >
> > Do you mind giving little more detail? We might have the same issue, where we got
> > complaints that midas history stops working after a certain time.
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17 Feb 2011, Stefan Ritt, Bug Report, Problems with midas history SVN 4936
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> uhm, mine might be completely unrelated to this, but it just so happened that the rev.
> 4936 was one that was used in a recent experiment, in which there was complaints about
> the responsiveness of the history plots. The history plots would take up to 30 seconds
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16 Feb 2011, Konstantin Olchanski, Bug Report, Problems with midas history SVN 4936
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> I have the following problems after updating to midas SVN 4936: the history
> system (web-page via mhttpd) seems to stop working. I checked the history files
> themself and they are indeed written, except that the events ID's are not the
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16 Feb 2011, Konstantin Olchanski, Bug Report, Problems with midas history SVN 4936
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It looks like email notices did not go the first time. Please read my replies below. K.O.
> > I have the following problems after updating to midas SVN 4936: the history
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23 Dec 2010, Konstantin Olchanski, Bug Report, odb corruption, odb race condition?
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The following script makes midas very unhappy and eventually causes odb corruption. I suspect the reason is some kind of race condition collision between
client
creation and destruction code and the watchdog activity (each client periodically runs cm_watchdog() to check if other clients are still alive, O(NxN) |
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24 Dec 2010, Konstantin Olchanski, Bug Report, odb corruption, odb race condition?
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> Thu Dec 23 12:10:30 2010 [ODBEdit9,ERROR] [odb.c:3247:db_get_value,ERROR] "Name" is of type NULL, not STRING
This is caused by a race condition between client removal in cm_delete_client_info() and cm_exist().
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24 Dec 2010, Konstantin Olchanski, Bug Report, odb corruption, odb race condition?
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> > Thu Dec 23 12:10:30 2010 [ODBEdit9,ERROR] [odb.c:3247:db_get_value,ERROR] "Name" is of type NULL, not STRING
> This is caused by a race condition between client removal in cm_delete_client_info() and cm_exist().
> ... this race condition seems to be benign.
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26 Dec 2010, Konstantin Olchanski, Bug Report, race condition and deadlock between ODB lock and SYSMSG lock in cm_msg()
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>
> The only remaining problem when running my script is some kind of deadlock between the ODB and SYSMSG semaphores...
>
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29 Dec 2010, Konstantin Olchanski, Bug Report, use of nested locks in MIDAS
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A "nested" or "recursive" lock is a special type of lock that permits a lock holder to lock the same resources again and again, without deadlocking on itself.
They are
very useful, but tricky to implement because most system lock primitives (SYSV semaphores, POSIX mutexes, etc) do not permit nested locks, so all the logic |
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29 Dec 2010, Konstantin Olchanski, Bug Report, fixed. odb corruption, odb race condition?
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>
> The only remaining problem when running my script is some kind of deadlock between the ODB and SYSMSG semaphores...
>
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11 Feb 2011, Konstantin Olchanski, Bug Report, fixed. odb corruption, odb race condition?
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> >
> > The only remaining problem when running my script is some kind of deadlock between the ODB and SYSMSG semaphores...
> >
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15 Feb 2011, Konstantin Olchanski, Bug Report, fixed. odb corruption, odb race condition?
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> Solution shall follow quickly, I have been hunting this deadlock for the last couple of weeks...
Over the last couple of days I made a series of commits to odb.c and midas.c to implement a buffer-based cm_msg()
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16 Feb 2011, Konstantin Olchanski, Bug Report, fixed. odb corruption, odb race condition?
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> My torture test runs okey in my mac now, one remaining problem is spurious client removal caused
> by semaphore starvation...
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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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15 Feb 2011, Konstantin Olchanski, Bug Fix, mlogger stop run on disk full!
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The mlogger has a function for detecting when the output disk becomes full - when this condition is
detected, the run should be stopped. But this did not work if disk is already full and the user tries to start
a run - the "disk full?" check happened too early and the attempt to stop the run was not succeeding
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15 Dec 2010, Stefan Ritt, Info, New source file structure of MSCB tree
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A long planned modification of the source file structure of the MSCB subsystem has been implemented. This is however only for those people who do actively
participate in micro controller programming with MSCB. The idea behind this is tha the central include file [B]mscbemb.h[/B] had a section for each new
project. So whenever a new project was added, this file had to be modified which is clumsy and hard to maintain. Therefore I took the project specific |
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06 Oct 2010, Konstantin Olchanski, Bug Report, mhttpd "edit on start" breakage
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very recent mhttpd mangles spaces in URL encoding-decoding and I cannot create or delete entries in for
example "/experiment/edit on start". For example attempt to delete "/experiment/Pedestals Run"
produces:
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17 Nov 2010, Stefan Ritt, Bug Report, mhttpd "edit on start" breakage
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> very recent mhttpd mangles spaces in URL encoding-decoding and I cannot create or delete entries in for
> example "/experiment/edit on start". For example attempt to delete "/experiment/Pedestals Run"
> produces:
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12 Nov 2010, Pierre-Andre Amaudruz, Release, Documentation
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The general Midas documentation has been rejuvenated by Suzannah Daviel through
a proof reading and with a collection of custom perl scripts to improve the
Doxygen capabilities for the document itself. In particular, a contents list and
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02 Nov 2010, chris pearson, Info, mhttpd: Extra entries on status page
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A couple of experiments at triumf wanted certain important odb variables
displayed on their status page. (There was already the possibility to show the
run comment)
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29 Oct 2010, Konstantin Olchanski, Info, mlogger.c 4858-4862 busted
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Please note that mlogger does not work (crashes on run start) starting with svn
rev 4858, fixed in svn 4862. If you have to use this busted version of mlogger,
the crash is fixed by update of history_midas.c to svn rev 4862 or set ODB
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23 Sep 2010, Konstantin Olchanski, Info, Example javascript midas page
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We had javascript ODBGet() and ODBSet() functions for some time now, permitting implementation of
"page-reload-free" "self-updating" web pages. I finally got around to put all the javascript bits together
to actually implement such a page. The main difference from a normal MIDAS "custom" page is the data
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23 Sep 2010, Stefan Ritt, Info, Example javascript midas page
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> We had javascript ODBGet() and ODBSet() functions for some time now, permitting
implementation of
> "page-reload-free" "self-updating" web pages. I finally got around to put all
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24 Sep 2010, Konstantin Olchanski, Info, Example javascript midas page
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> > We had javascript ODBGet() and ODBSet() functions for some time now, permitting
> implementation of
> > "page-reload-free" "self-updating" web pages. I finally got around to put all
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24 Sep 2010, Stefan Ritt, Info, Example javascript midas page
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> The attached errors all seem to be from cut-and-paste line breaks in the long "document.writeln()" statements.
> When the page runs, there are no errors from Firefox and Safari.
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23 Sep 2010, Stefan Ritt, Info, Another example of a JavaScript midas page
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Please find attached another example of a JavaScript (JS) page using the
ODBGet/Set functions.
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23 Sep 2010, Konstantin Olchanski, Info, Fixed ODB corruption by javascript ODBGet(nonexistant)
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Prior to odb.c rev 4829 and mhttpd.c rev 4830 committed a few minutes ago, HTML javascript
ODBGet("/non_existant_odb_entry") caused ODB corruption requiring ODB reload from backup file.
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13 Sep 2010, Konstantin Olchanski, Info, modified mhttpd history panel editor
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mhttpd.c svn rev 4823 implements a modified history planel editor. all previous functions should work
as before (minus new bugs).
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17 Sep 2010, Konstantin Olchanski, Info, modified mhttpd history panel editor
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> mhttpd.c svn rev 4823 implements a modified history planel editor. all previous functions should work
> as before (minus new bugs). New experimental functions added:
>
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20 Sep 2010, Stefan Ritt, Info, modified mhttpd history panel editor
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Just some idea:
The ultimate solution to that would be to do that completely JavaScript driven. You load ONCE the list of all
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17 Sep 2010, Konstantin Olchanski, Info, Added mserver host based access control
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In svn rev 4825, I added host based access control to mserver (the MIDAS RPC server). The implementation
is a verbatim copy mhttpd host based access control list (-a command line switch).
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04 Aug 2010, Konstantin Olchanski, Info, YBOS support now optional, disabled by default
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As of svn rev 4800, YBOS support was made optional, disabled by default. (But note that ybos.c is still used
by mdump). See HAVE_YBOS in the Makefile.
K.O. |
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31 Aug 2010, Konstantin Olchanski, Info, YBOS support now optional, disabled by default
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> As of svn rev 4800, YBOS support was made optional, disabled by default. (But note that ybos.c is still used
> by mdump). See HAVE_YBOS in the Makefile.
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08 Sep 2010, Stefan Ritt, Info, YBOS support now optional, disabled by default
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> It looks like some example drivers in .../drivers/class want to link against YBOS libraries.
> This fails because ybos.o is missing from the MIDAS library.
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30 Jul 2010, Konstantin Olchanski, Info, macos 10.6 success
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As of svn rev 4794, midas builds, runs and should be fully usable on MacOS 10.6.4. Previous revisions did
not compile due to assorted Linuxisms and did not run because of a sizeof() problem in ss_gettid(). Also
one of the system header files (mtio.h?) present in MacOS 10.5 vanished from 10.6.
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31 Aug 2010, Konstantin Olchanski, Info, macos 10.6 success
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> As of svn rev 4794, midas builds, runs and should be fully usable on MacOS 10.6.4. Previous revisions did
> not compile due to assorted Linuxisms and did not run because of a sizeof() problem in ss_gettid(). Also
> one of the system header files (mtio.h?) present in MacOS 10.5 vanished from 10.6.
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31 Aug 2010, Konstantin Olchanski, Info, Experimental POSIX shared memory support
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As of svn rev 4807, src/system.c has an experimental implementation of POSIX shared memory. It is
similar to the already existing implementation of MMAP shared memory, but uses POSIX shm_open()
instead of directly mmapping the .xxx.SHM file.
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