processors:

Xeon E5430 8 cores

speed 2.66GHZ

architecture EM64T

OS:

SLC5.4, i686, X86_64

test modes:

native mode (64bit/64bit)

BOSS

6.5.5

Event type:

• simulation

Inclusive MC jobs(single run, jpsi，psip，psipp) : 10 M
Exclusive MC jobs (multiple runs, jpsi，psip，psipp) : 2M

• simulation-reconstruction
• real-reconstruction

Stability check:

• More than 10M events used
• Problems:
  • 6 dead loops in EMC simulation are found among 10M events
  • Dead locks happened in lustre system when reading random trigger files in multi MC jobs with single run, which is caused by a bug in lustre current 64-bit client version
• Status:
  • Problems are fixed
  • no segment fault and no broken of any kind are found so far

Cpu time(50,000 events)

• Event process rate increases very significantly although varies among different applications and different data
  • Simulation speed increases about 13%
  • Reconstruction speed increases about 50%
  • Analysis speed increases about 50%
  • Reconstruction and analysis benefit a lot, twice faster than 32-bit
• Such increases are proved by further tests:
  • Geant4 tests : 8~19%
  • Module by module tests on reconstruction : ~50%
  • KalFit 54%, EmcRec 49%, TofRec 43%, MucRec 49%

Memory usage(20,000 events)

• There are two measures of memory to be monitoring here: VSize, RSS
• The process is to be monitoring: simulation, simulation-reconstruction, real-reconstruction
• Memory consumed for 64-bit BOSS nearly twice larger than that of 32-bit BOSS :
  • It also varies among different processes and different data
  • Virtual memory : ~1500MB(simu), ~1400MB(rec)
  • Resident memory : ~600MB(simu), ~500MB(rec)

• Some reasons for significant memory increases of 64-bit applications
  • Certain data types (e.g. pointers, size_t) increase in size, resulting in larger data structures
  • Alignment/padding of data structures are larger at 64bit
  • Code size in libraries increase at 64bit
  • Administrative overhead and alignment for objects created in the heap typically increases
  • Conclusions:
    • Memory consumption are almost doubled
    • It is reasonable and still in an acceptable scope

Memory leaks(20,000 events)

• Processes:
  • simu, simu-reco, real-reco
• Leaks are found both in 32-bit systems and 64-bit systems
  • Leaks are also enlarged in 64-bit
  • Simulation about 4.54KB/event
  • Reconstruction about 7.37KB/event
• Conclusions:
  • Memory leakage is not obvious
  • It is acceptable

-- ZhangXiaomei - 2011-03-02