OS : CentOS Linux release 6.0 (Final) 64bit
GPU: Tesla M2090

[Used modules& version]： mcx, mcx_atomic, mcx_cached
$>mcx -v
MCX Revision 258
$>mcx_atomic -v
MCX Revision 258
$>mcx_cached -v
MCX Revision 258

[Execusion command]
* mcx
mcx -t 1024 -n 1000000000 -f T1.inp -s test_1024_1000000000 -a 0 -b 0 -p 1
mcx -t 2048 -n 1000000000 -f T1.inp -s test_2048_1000000000 -a 0 -b 0 -p 1
mcx -t 4096 -n 1000000000 -f T1.inp -s test_4096_1000000000 -a 0 -b 0 -p 1
mcx -t 8192 -n 1000000000 -f T1.inp -s test_8192_1000000000 -a 0 -b 0 -p 1

* mcx_atomic
mcx_atomic -t 1024 -n 1000000000 -f T1.inp -s test_atomic_1024_1000000000 -a 0 -b 0 -p 1
mcx_atomic -t 2048 -n 1000000000 -f T1.inp -s test_atomic_2048_1000000000 -a 0 -b 0 -p 1
mcx_atomic -t 4096 -n 1000000000 -f T1.inp -s test_atomic_4096_1000000000 -a 0 -b 0 -p 1
mcx_atomic -t 8192 -n 1000000000 -f T1.inp -s test_atomic_8192_1000000000 -a 0 -b 0 -p 1

* mcx_cached
mcx_cached -t 1024 -n 1000000000 -f T1.inp -s test_cached_1024_1000000000 -a 0 -b 0 -p 1 -R -1
mcx_cached -t 2048 -n 1000000000 -f T1.inp -s test_cached_2048_1000000000 -a 0 -b 0 -p 1 -R -1
mcx_cached -t 4096 -n 1000000000 -f T1.inp -s test_cached_4096_1000000000 -a 0 -b 0 -p 1 -R -1
mcx_cached -t 8192 -n 1000000000 -f T1.inp -s test_cached_8192_1000000000 -a 0 -b 0 -p 1 -R -1

[Files]

* T1.inp
=================================================================================
1000000                       # total photon
1749605793                    # RNG seed, negative to generate
61.000 61.000 1.000           # source position (in grid unit)
0.000 0.000 1.000             # initial directional vector
0.0e+00 2.0e-09 1.0e-9        # time-gates(s): start, end, step
./seg.bin                     # segmentation volume file name
1 121 58 64                   # x: voxel size (mm), dim, start/end indices 
1 121 58 64                   # y: voxel size (mm), dim, start/end indices 
1  60  1 10                   # z: voxel size (mm), dim, start/end indices
1                             # num of media
7.0000 0.9000 0.0180 1.4000   # mus (1/mm), g, mua (1/mm), n
1 1                           # detector number and radius  (in grid unit)
91.000 61.000 1.000           # detector-1 position  (in grid unit)
=================================================================================

* seg.bin