 23 Feb 2007, John M O'Donnell, Info, RFC- support for writing to removable hard disk storage
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We stopped using tapes at Los Alamos a while ago. The model we use is:
write data with mlogger to a local RAID system. This is NFS mounted read only on teh analysis machines, and
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26 Feb 2007, Stefan Ritt, Info, RFC- history system improvements
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I agree to what you propose. I'm pretty sure you are right in getting a significant improvement in readout speed
of the history system. So far there was no big request for improving the history system, since the performance in
the experiments I was involved in was good. In MEG for example, we have ~20MB of history data per day, and all
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26 Feb 2007, Stefan Ritt, Info, RFC- support for writing to removable hard disk storage
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In the MEG experiment, we simply installed 100TB of RAID disks and don't need to change anything ;)
But seriously, you are right that such a system might be beneficial. I propose to extend the current logger code to switch disks. In the current tr_start() |
 26 Feb 2007, Stefan Ritt, Info, Usage of event channel for improved throughput
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Starting from SVN revision 3642, sending events from the front-end has been revised.
Since long time ago, there is a special TCP socket established between any front-end and the mserver which can be used to bypass the midas RPC layer completely |
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26 Feb 2007, Stefan Ritt, Info, Fragmented polled events
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Fragmented polled events have been implemented in SVN revision 3625.
Fragmentation is a method of breaking down large (>MB) events into smaller
pieces and send them through the shared memory buffers, reassembling them at the
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06 Mar 2007, Konstantin Olchanski, Info, commited mhttpd fixes & improvements
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I commited the mhttpd fixes and improvements to the history code accumulated while running the ALPHA
experiment at CERN:
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15 Mar 2007, Konstantin Olchanski, Info, mhdump: a standalone MIDAS history dump utility
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While working on improvements to the MIDAS history system, I understood the data
format of the MIDAS .hst files and wrote a standalone program to extract data
from them, called mhdump.
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15 Mar 2007, Stefan Ritt, Info, mhdump: a standalone MIDAS history dump utility
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> I hope people find this program useful. If you have any feedback (patches, bug
> reports, requests for improvements), please post them as replies to this forum
> message.
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16 Mar 2007, Konstantin Olchanski, Info, RFC- history system improvements
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> Let's improve the midas history system...
After implementing 2 prototypes, one aspect of the new design is starting to firm up enough to write it down (I do so in a mock FAQ format).
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03 Apr 2007, Stefan Ritt, Info, Switch to Visual C++ 2005 under Windows
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I had to switch to Visual C++ 2005 under Windows. This required the upgrade of
all project files under \midas\nt\ and fixing a few warnings, since the new
compiler is more picky.
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09 Apr 2007, Konstantin Olchanski, Info, move history, elog and alarm functions into separate files
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As approved by Stefan, I moved the history (hs_xxx), alarm (al_xxx) and elog (el_xxx) functions out of
midas.c into separate files. Commited as revision 3665. This change should be transparent to all users.
K.O. |
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10 May 2007, Konstantin Olchanski, Info, RHEL5/SL5 success!
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FWIW, I am running latest 32-bit MIDAS on an AM2 dual core AMD machine under 64-bit SL5. Everything
seems to work correctly. K.O.
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21 May 2007, Konstantin Olchanski, Info, mhttpd changes to use /History/Tags data
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I am slowly commiting the changes to the history code. This installement adds
code to mhttpd to use the /History/Tags data (to be) generated by the mlogger.
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03 Jul 2007, Ryu Sawada, Info, RHEL5/SL5 success!
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> P.S. For the record, the compiler produces two sets of warnings:
> - warning: dereferencing type-punned pointer will break strict-aliasing rules
> (I do not understand the meaning of the second warning. type-punned pointer, huh?)
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26 Jul 2007, Stefan Ritt, Info, Change of pointer type in mvmestd.h
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I had to change the pointer type of mvme_read and mvme_write to (void *) instead
to (mvme_locaddr_t *) to avoid warnings under 64-bit linux. Please adjust your
VME drivers if necessary.
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12 Aug 2007, Konstantin Olchanski, Info, Change of pointer type in mvmestd.h
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> I had to change the pointer type of mvme_read and mvme_write to (void *) instead
> to (mvme_locaddr_t *) to avoid warnings under 64-bit linux. Please adjust your
> VME drivers if necessary.
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29 Aug 2007, Konstantin Olchanski, Info, Added data compression to mlogger
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I now commited the changes to mlogger (mlogger.c, msystem.h) implementing data
compression using zlib (svn revision 3845)
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06 Sep 2007, Stefan Ritt, Info, Introduction of MIDAS_MAX_EVENT_SIZE
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We had the problem that different experiments used different MAX_EVENT_SIZE
values (the MEG experiment actually 10 MB!). If each experiment changes the
value in midas.h and accidentally commits it, other experiments are affected.
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02 Oct 2007, Konstantin Olchanski, Info, ROODY, ROOTANA updates
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The ROODY online histogram viewer and the ROOTANA midas analyzer toolkit have been updated to work
with ROOT version 5.16 and tested on Linux (SL4.4) and MacOS (10.4.10/PPC).
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20 Nov 2007, Konstantin Olchanski, Info, mhdump: a standalone MIDAS history dump utility
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> > I hope people find this program useful. If you have any feedback (patches, bug
> > reports, requests for improvements), please post them as replies to this forum
> > message.
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