VLVNT Amsterdam 2003 – J. Panman 1 DAQ: comparison with an LHC DAQ: comparison with an LHC experiment experiment J. Panman CERN VLVNT workshop 7 Oct 2003 Use as example CMS (slides taken from Cittolin's talk at LHCC) Take numbers floating around this week as typical performance needs S U PERFICIA L!
J. Panman CERN VLVNT workshop 7 Oct 2003. DAQ: comparison with an LHC experiment. Use as example CMS (slides taken from Cittolin's talk at LHCC) Take numbers floating around this week as typical performance needs. Data source: sampling frequency200- 400 Mhz sampling precision8 bits - PowerPoint PPT Presentation
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VLVNT Amsterdam 2003 – J. Panman 1
DAQ: comparison with an LHC experimentDAQ: comparison with an LHC experiment
J. Panman
CERN
VLVNT workshop 7 Oct 2003
Use as example CMS (slides taken from Cittolin's talk at LHCC)Take numbers floating around this week as typical performance needs
SUPERFI CI AL!
VLVNT Amsterdam 2003 – J. Panman 1
Data to shore:links per tower/string 1data rate/link 1.6 Gbits/stotal data rate 640 Gbits/s
Comparison of design parametersComparison of design parameters
Take numbers floating around this week as typical performance needsFor simplicity: use a “digitized scenario” (waveforms transmitted)
Data source:sampling frequency 200-400 Mhzsampling precision 8 bitssample length 50-100 nsNo. OMs 10000No. towers/strings 400Background rate 50-200 kHz/OM
Event organization:“Event” window length 10 mssize of data/event 800 Mb
VLVNT Amsterdam 2003 – J. Panman 1
Data to shore:links per tower/string 1data rate/link 1.6 Gbits/stotal data rate 640 Gbits/s
Comparison of design parametersComparison of design parameters
Take numbers floating around this week as typical performance needsFor simplicity: use a “digitized scenario” (waveforms transmitted)
Data source:sampling frequency 200-400 Mhzsampling precision 8 bitssample length 50-100 nsNo. OMs 10000No. towers/strings 400Background rate 50-200 kHz/OM
Event organization:“Event” window length 10 mssize of data/event 800 Mb
Data to surface:Average event size 1 MbyteNo. FED S-link64 ports 700DAQ links (2.5 Gb/s) 512+512Event fragment size 2 kBFED builders (8x8 dual) 64Technology(2004) Myrinet
Total data rate:total data rate 800 Gbits/s
CMS
VLVNT Amsterdam 2003 – J. Panman 1
CreditsCredits
slides taken from Cittolin's talk at LHCC
VLVNT Amsterdam 2003 – J. Panman 1
Front endFront end
Desktop/Servercurrent architecturePeripheral IO bus PCI:33/66 MHz x 32/64 bit100/200/400 MB/sPxx
MEM
Pxx
Pxx
Pxx
264 MB/s
GByte memoryMultiProcessor
PCI
PCI
264 MB/s
Dual PCI
1990' PCI
Pxx
Pxx
Pxx
Pxx
SIO
MEM
200X: PCI-X …
FE digitizerData from a string
DSP-like operation:filter produces time&charge from waveform assume 8 bytes to encode(reduction x3)
Data from a string Readout network
VLVNT Amsterdam 2003 – J. Panman 1
Network configurationsNetwork configurations
EVB staging by switch expansion:EVB staging by switch expansion:
FED -> FE digitizer
VLVNT Amsterdam 2003 – J. Panman 1
CMS – 2 stages: Data to surface & Readout CMS – 2 stages: Data to surface & Readout BuilderBuilder
Readout Builder (up to 8)64x64 x 2.5 Gb/s switchEvent rate 12.5 kHz
2 kByte
16 kByte
Dat
a to
su
rfac
e (r
ate
dec
imat
ion
)
FED Builder (64 units)8x8 x 5 Gb/s switchEvent fragments merger