Charm++ parallel programming system

[vishwas vasudeva <vishvasu98 AT gmail.com>]

Respected sir/madam,

I am running jacobi3d ampi program in bigFastSim for various number of nodes.

But the virtual time is remaining almost constant.i thought it should scale up (it should decrease I thought).

Please help to figure it out.

The outputs are, for 128*128*128 cube

1. for 2 nodes

Latency:1 us bandwidth:1 GB/s Window size:0 Cpu Factor:1.000000

totalWorkers:2, numX:2, numY:1 numZ:1 numCth:1 numWth:1 numPes:1

simulation time(s): init=0.01 exec=0.00 total=0.01

virtual time: 871774797 ns

2. for 4 nodes

Latency:1 us bandwidth:1 GB/s Window size:0 Cpu Factor:1.000000

totalWorkers:4, numX:4, numY:1 numZ:1 numCth:1 numWth:1 numPes:1

simulation time(s): init=0.01 exec=0.00 total=0.01

virtual time: 1018439200 ns

3. for 8 nodes

Latency:1 us bandwidth:1 GB/s Window size:0 Cpu Factor:1.000000

totalWorkers:8, numX:8, numY:1 numZ:1 numCth:1 numWth:1 numPes:1

simulation time(s): init=0.02 exec=0.00 total=0.03

virtual time: 848345535 ns

4. for 16 nodes

Latency:1 us bandwidth:1 GB/s Window size:0 Cpu Factor:1.000000

totalWorkers:16, numX:16, numY:1 numZ:1 numCth:1 numWth:1 numPes:1

simulation time(s): init=0.05 exec=0.00 total=0.05

virtual time: 833318660 ns

similarly for 256 nodes,

Latency:1 us bandwidth:1 GB/s Window size:0 Cpu Factor:1.000000

totalWorkers:256, numX:256, numY:1 numZ:1 numCth:1 numWth:1 numPes:1

simulation time(s): init=0.76 exec=0.06 total=0.82

virtual time: 892766395 ns

Please help me to resolve this.

Thanking you,

Vishwas V.K.