 06 Feb 2007, Stefan Ritt, Bug Report, segmentation violation of analyzer on a x86_64
|
> Hello,
>
> When I connect to analyzer on a x86_64 processor(with Roody),
|
|
26 Feb 2007, Stefan Ritt, Info, RFC- history system improvements
|
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
|
|
26 Feb 2007, Stefan Ritt, Info, RFC- support for writing to removable hard disk storage
|
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
|
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 |
|
26 Feb 2007, Stefan Ritt, Info, Fragmented polled events
|
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
|
|
27 Feb 2007, Stefan Ritt, Forum, event builder scalability
|
> Hi there:
> I have a question if there's anybody out there running MIDAS with event builder
> that assembles events from more that just a few front ends (say on the order of
|
|
27 Feb 2007, Stefan Ritt, Forum, event builder scalability
|
> Our bottle neck is (a) compactPCI backplane reading data from waveform digitizers
> to the frontend CPUs and (b) CPU power on the frontend CPUs to analyzer the waveforms.
|
|
03 Mar 2007, Stefan Ritt, Forum, event builder scalability
|
> It seems that there's no problem running MIDAS with event builder assembling
> data from ~10 front-ends. How about ~100? One possible solution is to have a
> multi-tiered architecture.
|
|
15 Mar 2007, Stefan Ritt, Info, mhdump: a standalone MIDAS history dump utility
|
> 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.
|
|
03 Apr 2007, Stefan Ritt, Info, Switch to Visual C++ 2005 under Windows
|
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.
|
|
03 Apr 2007, Stefan Ritt, Bug Fix, SIGABT of "mlogger" and possible fix
|
[quote="Exaos Lee"]Version: svn 3658
Code: mlogger.c
Problem: After executation of "mlogger", a "SIGABT" appears.
|
|
09 May 2007, Stefan Ritt, Forum, Splitting data transfer and control onto different networks
|
Hi Carl,
so far I did not experience any problems of running odb&alarm on the same link as
|
|
22 May 2007, Stefan Ritt, Bug Report, analyzer_init called by odb_load
|
The reason to call analyzer_init in odb_load is the following:
Assume you run the analyzer offline, analyzing many files in series. Then assume
|
|
22 May 2007, Stefan Ritt, Bug Report, analyzer_init called by odb_load
|
> Thanks for the quick reply, Stefan.
>
> Please don't change anything in the code unless you find it really important.
|
|
08 Jun 2007, Stefan Ritt, Suggestion, RFC- ACLs for midas rpc, mserver, mhttpd access
|
First I have a general question: mserver is started through xinetd, and xinetd has
the options "only_from" and "no_access". This is equivalent to the tcp_wrapper
functionality. Why not using this? It's possible without changing anything in midas.
|
|
08 Jun 2007, Stefan Ritt, Forum, crash when analyzing multiple runs offline
|
Unfortunately I don't have time right now to debug the problem, but I could see
roughly what it could be. The analyzer crashes inside CloseRootOutputFile:
|
|
10 Jun 2007, Stefan Ritt, Forum, crash when analyzing multiple runs offline
|
> tree_struct.n_tree keeps counting up from run to run (in book_ttree). This should
> presumably not be the case, since CloseRootOutputFile() frees the trees at eor().
|
|
11 Jun 2007, Stefan Ritt, Forum, crash when analyzing multiple runs offline
|
> I have hunted down "my" segfault problem to the fact that I book histograms not
> in <module>_init, but in <module>_bor. I have to do so, because only in bor do I
> know which histograms to book, as this information comes from the ODB (booking
|
|
02 Jul 2007, Stefan Ritt, Bug Fix, mscb, musbstd fixed on Linux, MacOS
|
[quote="KO"]There supposed to be no changes to the Windows code, but I cannot test on Windows, so if somebody does and finds breakage, please let me know.[/quote]
I can confirm that revision 3713 still works under Windows. |
|
13 Jul 2007, Stefan Ritt, Forum, Midas on a x86_64 - incompatible with x86_32
|
> The biggest problem here is that making 32-bit ODB and 64-bit ODB compatible requires breaking one or
> the other (My proposed changes break the 64-bit version. Alternatively, one could add explicit padding
> to these data structures and break the 32-bit ODB).
|