 27 Jun 2011, Konstantin Olchanski, Info, midas shared memory changes
|
A number of changes were made to the midas shared memory implementation for
Linux and MacOS:
|
|
27 Jun 2011, Konstantin Olchanski, Info, mlogger lock for runNNN.mid.gz files
|
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
|
 05 Jul 2011, Konstantin Olchanski, Info, midas shared memory changes
|
> 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
|
|
05 Jul 2011, Konstantin Olchanski, Bug Report, MacOS network socket timeouts non-functional
|
It turns out that because of differences between select() syscall implementation between UNIX (MacOS,
maybe BSD) and Linux, network socket timeouts do not work.
|
|
10 Jul 2011, Konstantin Olchanski, Bug Fix, midas shared memory changes
|
> > 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.
|
|
11 Jul 2011, Konstantin Olchanski, Bug Fix, midas shared memory changes
|
> > > 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.
|
|
11 Jul 2011, Konstantin Olchanski, Info, Make "STOP" run transition always succeed
|
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).
|
|
16 Dec 2011, Konstantin Olchanski, Bug Report, bk_delete uses memcpy instead of memmove
|
> 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.
|
|
29 Feb 2012, Konstantin Olchanski, Bug Report, Problem with semaphores
|
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
|
|
25 Apr 2012, Konstantin Olchanski, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’
|
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.
|
|
10 Jun 2012, Konstantin Olchanski, Bug Report, _net_send_buffer realloc
|
> In midas.c, ...
>
> 1) _net_send_buffer is not set to NULL when declared.
|
|
11 Jun 2012, Konstantin Olchanski, Bug Report, _net_send_buffer realloc
|
> > > In midas.c, ...
> > >
> > > 1) _net_send_buffer is not set to NULL when declared.
|
|
13 Jun 2012, Konstantin Olchanski, Bug Report, Cannot start/stop run through mhttpd
|
> Revision: r5286
> Platform: Debian Linux 6.0.5 AMD64, with packages from squeeze-backports
> Problem:
|
|
13 Jun 2012, Konstantin Olchanski, Forum, ladd00.triumf.ca https ssl certificate update
|
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".
|
|
14 Jun 2012, Konstantin Olchanski, Bug Report, Cannot start/stop run through mhttpd
|
> > 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
|
|
14 Jun 2012, Konstantin Olchanski, Bug Report, Cannot start/stop run through mhttpd
|
> > > Revision: r5286
> > > Platform: Debian Linux 6.0.5 AMD64, with packages from squeeze-backports
>
|
|
15 Jun 2012, Konstantin Olchanski, Bug Report, bk_delete uses memcpy instead of memmove
|
> 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.
|
|
15 Jun 2012, Konstantin Olchanski, Bug Report, _net_send_buffer realloc
|
> 2) cm_disconect_experiment() calls free(_net_send_buffer) but does not set its
> value to NULL.
|
|
20 Jun 2012, Konstantin Olchanski, Info, lazylogger write to HADOOP HDFS
|
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
|
20 Jun 2012, Konstantin Olchanski, Info, midas vme benchmarks 
|
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).
|