1. Emanuele Leonardi PADME Weekly Meeting - LNF February 9th, 2018
Computing
Emanuele Leonardi
PADME Weekly Meeting - LNF February 9th, 2018

2. Optical link between IT and BTF
8-12 monomodal fibers
10Gbps LR (up to 3km)
Rodent-proof
2 x 10Gbps LAT-IT connections available for PADME
LAT CR
10Gbps connection between LAT and CR
BTF T2 IT
Available now
Order underway
15/12/2017
E. Leonardi - WM Networking

3. E. Leonardi - WM 2018-02-09 - Computing
PADME central switch
Server per L1 e disk storage
Server per RC, DB, DCS e Online Monitor
Trigger system
DAQ node (l0padme4)
DAQ VME crates
9/2/2018
E. Leonardi - WM Computing

4. 10Gbps connectivity test
l1padme1 and l1padme2 (disk buffer nodes) are now connected with optical fiber at 10Gbps to the PADME central switch
Network speed test (TCP) confirms about 9.4Gbps link between the two nodes
Data transfer disk to disk via scp (not very efficient):
l1padme1 ↔ l1padme2 180MB/s
l0padme4 ↔ l1padme MB/s (l0padme4 on 1Gbps link)
9/2/2018
E. Leonardi - WM Computing

5. Event Format (DAQ & RAW)
The DAQ and RAW event formats currently in use were defined in 2015 and were used in all testbeams since.
Well suited for testbeam needs but lack some general information (e.g. global timing)
In order to support a full data acquisition some revamping of the formats is needed.
9/2/2018
E. Leonardi - WM Computing

6. DAQ data format Added board serial number to file header
Enlarged event status bit pattern
Added code of 0-suppression algorithm used
Status pattern
b0: [0=event is empty|1=event has data]
b1: [DRS4 corrections 0=not applied|1=applied]
(b2,b3): [0-suppression 00=off, 01=flagging, 10=rejection, 11=reserved])
b4: board fail (BF) flag
(b5-b9): reserved
9/2/2018
E. Leonardi - WM Computing

7. RAW data format
TADCBoard
UChar_t
fBoardId
UInt_t
fBoardSN
UShort_t
fLVDSPattern
fBoardStatus
fStatus (obsolete)
fGroupMask
fEventCounter
fEventTimeTag
f0SuppAlgrtm
fActiveChannelMask
fAcceptedChannelMask
fNADCChannels
TClonesArray*
fADCChannels
fNADCTriggers
fADCTriggers
TADCChannel
UChar_t
fChannelNumber
Short_t
fSamples[1024]
TADCTrigger
UChar_t
fGroupNumber
UShort_t
fStartIndexCell
fFrequency
Bool_t
fTriggerSignal
UInt_t
fTriggerTimeTag
Short_t
fSamples[1024]
TRawEvent
UInt_t
fRunNumber
fEventNumber
TTimeStamp
fEventAbsTime
fEventRunTime
fEventTrigMask
fEventStatus
UChar_t
fNADCBoards
TClonesArray*
fADCBoards
fBoardSN, fBoardStatus, and f0SuppAlgrtm are copyed from the DAQ data format
N.B. fStatus is kept for downward compatibility. Will disappear in the future.
fEventAbsTime is the global UTC time on the L1 server when the event is merged. Servers use NTP so timing should be good down to the ms level.
fEventRunTime is the time from the start of the run. It is computed taking into account the timing information of all the boards (which should in principle be well synchronized).
fEventTrigMask and fEventStatus are 32 bits patterns reserved for future use.
As the new format is a superset of the previous format and the old class interfaces are respected, all code currently in use for analysis should in principle work with files in the new format (need to recompile using the new libraries, of course).
I am now studying how to create code that can use both old and new format (possible according to ROOT).