 24 Apr 2026, Konstantin Olchanski, Bug Report, increasing the max number of hot links in ODB
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> when I attempted to increase the max number of hotlinks in ODB , defined as
> #define MAX_OPEN_RECORDS 256 /**< number of open DB records */
> assert(sizeof(DATABASE_CLIENT) == 2112);
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25 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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I see - thank you for the explanation!
Indeed, updating MIDAS clients on each and every RPI etc in a running experiment may be a real challenge.
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27 Apr 2026, Stefan Ritt, Bug Report, increasing the max number of hot links in ODB
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I wonder why one needs more than 256 hotlinks at all. Please note that with the odbxx "watch" API, you can hotline a whole subdirectory, and get notified
if ANY of the
underlying values or subdirectories change. In principle, one could have one hotlink to "/" and see all changes in the ODB (although that does not make |
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27 Apr 2026, Konstantin Olchanski, Bug Report, increasing the max number of hot links in ODB
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> Indeed, updating MIDAS clients on each and every RPI etc in a running experiment may be a real challenge.
actually, only local clients must be rebuilt, remote clients connecting to the mserver do not care about ODB
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27 Apr 2026, Konstantin Olchanski, Bug Report, increasing the max number of hot links in ODB
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> I wonder why one needs more than 256 hotlinks at all.
I confirm that ALPHA is running with MAX_OPEN_RECORDS changed from 256 to 2048,
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27 Apr 2026, Nick Hastings, Bug Report, increasing the max number of hot links in ODB
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For the record, the ND280 (T2K near detector) MIDAS GSC was initially set up
with MAX_OPEN_RECORDS = 2560 and MAX_CLIENTS = 128.
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27 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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> I wonder why one needs more than 256 hotlinks at all. Please note that with the odbxx "watch" API, you can hotline a whole subdirectory, and get notified
if ANY of the
> underlying values or subdirectories change. In principle, one could have one hotlink to "/" and see all changes in the ODB (although that does not make |
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27 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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> > I wonder why one needs more than 256 hotlinks at all.
>
> I confirm that ALPHA is running with MAX_OPEN_RECORDS changed from 256 to 2048,
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27 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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> > Indeed, updating MIDAS clients on each and every RPI etc in a running experiment may be a real challenge.
>
> actually, only local clients must be rebuilt, remote clients connecting to the mserver do not care about ODB
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 15 Feb 2017, NguyenMinhTruong, Bug Report, increase event buffer size
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Dear all,
I have problem in event buffer size.
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15 Feb 2017, NguyenMinhTruong, Bug Report, increase event buffer size
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Dear all,
I have problem in event buffer size.
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16 Feb 2017, Konstantin Olchanski, Bug Report, increase event buffer size
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> I have problem in event buffer size.
>
> When run MIDAS, I got error "total event size (1307072) larger than buffer size
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20 Feb 2017, NguyenMinhTruong, Bug Report, increase event buffer size
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I am sorry for my late reply memory in my PC is 16 GB I check the contents of .SHM_TYPE.TXT and it is "POSIXv2_SHM". But there is no buffer
sizes in "/Experiment" After run "ipcrm -M 0x4d040761 size0x204a3c", remove .SYSTEM.SHM and run MIDAS again, I still get error "Shared
memory segment with key 0x4d040761 already exists, please remove it manually: ipcrm -M 0x4d040761 size0x204a3c" M.T |
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20 Feb 2017, NguyenMinhTruong, Bug Report, increase event buffer size
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I am sorry for my late reply
memory in my PC is 16 GB
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20 Feb 2017, Konstantin Olchanski, Bug Report, increase event buffer size
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> memory in my PC is 16 GB
You can safely go to buffer size 100 Mbytes or more.
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20 Feb 2017, Konstantin Olchanski, Bug Report, increase event buffer size
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> memory in my PC is 16 GB
You can safely go to buffer size 100 Mbytes or more.
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20 Feb 2017, Konstantin Olchanski, Bug Report, increase event buffer size
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> > memory in my PC is 16 GB
>
> You can safely go to buffer size 100 Mbytes or more.
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14 Aug 2019, Konstantin Olchanski, Bug Fix, incorrect recursion in ss_suspend() via the user event handler
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The ROOTANA midas analyzer uncovered a problem with recursive use of ss_suspend().
When running in graphical mode, the ROOT graphics main event loop was calling
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18 Mar 2016, William Page, Bug Report, incomplete copy using odbedit copy
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Hi,
Attempting to copy a subtree to a new location in the ODB using odbedit with "copy <src> <dest>" is
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22 Mar 2016, Stefan Ritt, Bug Report, incomplete copy using odbedit copy
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> Hi,
>
> Attempting to copy a subtree to a new location in the ODB using odbedit with "copy <src> <dest>" is
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