 04 Mar 2010, Konstantin Olchanski, Info, Notes on MIDAS Alarm system
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Notes on the implementation of the MIDAS alarm system.
Alarms are checked inside alarm.c::al_check(). This function is called by
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 26 Jun 2010, Konstantin Olchanski, Forum, Error connecting to back-end computer
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> This is my first time running an experiment on separate computers. I followed
> the documentation (https://midas.psi.ch/htmldoc/quickstart.html) to setup the
> files:
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29 Jun 2010, Konstantin Olchanski, Forum, Error connecting to back-end computer
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> > The way connections work under Midas is there is a callback scheme. The client starts
> > mserver on the back-end, then the back-end connects back to the front-end on three
> > different ports. These ports are assigned dynamically by the operating system and are
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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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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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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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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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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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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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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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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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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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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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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 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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