Ptolemy EVM Simulation - PowerPoint PPT Presentation

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Ptolemy EVM Simulation

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S. Aziz, M. Litmaath, V. O'Dell, K. Sumorok, I. Suzuki. CPT week, April 2002. 1 ... S. Aziz, M. Litmaath, V. O'Dell, K. Sumorok, I. Suzuki. CPT week, April 2002. 2 ... – PowerPoint PPT presentation

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Title: Ptolemy EVM Simulation


1
Ptolemy EVM Simulation
  • Current options
  • -evm
  • BM on Myrinet, RM uses simple external RCN
  • Trigger
  • Poisson (default), or Gaussian with cut-off
  • Event fragments default LogNormal
  • BU emulates filter farms
  • Farm processing time
  • LogNormal (default)
  • Gaussian with cut-off
  • Input histogram
  • -evma
  • -evm RCN over Myrinet
  • -evmb
  • -evma Barrel Shifter on Builder Unit side

2
RCN over Myrinet
3
Configuration for plots
  • 63x63 system BM RM
  • RCN over Myrinet (-evma)
  • Trigger 12.5 kHz (Poisson)
  • Message event ID packing RCN 2, BCN 1
  • Event fragments LogNormal 16/-16 kB/RU, unless
    otherwise specified
  • Farm processing time (FPT) LogNormal, values
    given per plot
  • Each BU emulates 8 filter nodes
  • Average FPT should not exceed 40 ms/event
  • BU returns an event ID at the end of its FPT (!)

4
Poisson trigger distribution
ms
5
Event fragment distribution
6
Active events in EVM, FPT 40 /- 0ms
ms
7
Farm Processing Time Distribution, 40/-20 ms
ms
8
Active events in EVM, FPT 40/-20ms
Steady state level increase supposedly due to
queuing in filter nodes. Event with large FPT wil
l delay return of all following events sent to
that filter node. System should stabilize if FPT
average does not exceed 40 ms.
ms
9
Active events in EVM, FPT 40/-40ms
ms
10
Myrinet RCN Latency
ms
11
RCN latency with BS on BU side (-evmb)
ms
12
Active events in EVM, FPT 30/-30 ms
ms
13
RU max. memory usage (FPT 30/-30 ms)
As long as the BUs have free resources, this is
independent of the FPT (modulo differences in
random generator usage).
ms
14
BU max. active events, FPT 30/-30 ms
ms
15
BU max. memory usage, FPT 30/-30 ms
ms
16
Active events in EVM, FPT 30/-30 ms, Event
Fragments 16 /- 16/sqrt(8) kB/RU
ms
17
Active events in EVM, FPT 0/-0 ms,trigger
12.5/-0 kHz, event fragments 16/-0 kB
ms
18
Conclusions and outlook
  • RCN over Myrinet appears to work
  • Baseline?
  • Farm emulation can use HLT event processing time
    input histograms
  • Still need to resolve Ptolemy crashes at 8.5 s
    of running
  • Calendar queue time-ordering problem
  • Possibly due to floating point round-off
  • What else needed for the EVM simulation?
  • Compare with test stands what configurations?
  • Error injection?
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