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[Ziyu Wang <question702331@xxxxxxxxxxxxxxxxxxxxx>]

New question #702331 on Yade:
https://answers.launchpad.net/yade/+question/702331

Hi,
I have encountered problems similar to those in [1] while trying to GPU acceleration.similarly,I run the sh gpu.sh to test CHOLMOD’s GPU functionality, I got the result below.
My versions:Ubuntu 18.04.6 LTS, CUDA version:11.7, NVIDIA driver version: 515.43.04, SuiteSparse:5.12.0
Thanks for any help!
---------------------------------- cholmod_l_demo:
cholmod version 3.0.14
SuiteSparse version 5.12.0
norm (A,inf) = 203.333
norm (A,1)   = 203.333
CHOLMOD sparse:  A:  18000-by-18000, nz 3457658, upper.  OK
CHOLMOD dense:   B:  18000-by-1,   OK
bnorm 1.99994
Analyze: flop 1.15165e+11 lnz 4.07336e+07
Factorizing A
CHOLMOD factor:  L:  18000-by-18000  supernodal, LL'.  nz 41793167  OK
nmethods: 1
Ordering: AMD     fl/lnz     3911.5  lnz/anz       14.8
Ordering: METIS   fl/lnz     2827.3  lnz/anz       11.8
ints in L:          212740, doubles in L:        55587325
factor flops 1.15165e+11 nnz(L)        40733584 (w/no amalgamation)
nnz(A*A'):         3457658
flops / nnz(L):    2827.3
nnz(L) / nnz(A):     11.8
analyze cputime:        0.9524
factor  cputime:         7.9463 mflop:  14492.9
solve   cputime:         0.0529 mflop:   3078.8
overall cputime:         8.9516 mflop:  12883.5
solve   cputime:         0.0437 mflop:   3724.8 (100 trials)
solve2  cputime:         0.0000 mflop:      0.0 (100 trials)
peak memory usage:          631 (MB)
residual (|Ax-b|/(|A||x|+|b|)): 1.60e-15 2.58e-15 
residual  1.5e-16 (|Ax-b|/(|A||x|+|b|)) after iterative refinement
rcond     4.9e-04


CHOLMOD GPU/CPU statistics:
SYRK  CPU calls          799 time   2.1152e+00
      GPU calls            0 time   0.0000e+00
GEMM  CPU calls          628 time   5.8567e-01
      GPU calls            0 time   0.0000e+00
POTRF CPU calls          172 time   7.2829e-01
      GPU calls            0 time   0.0000e+00
TRSM  CPU calls          171 time   3.3862e-01
      GPU calls            0 time   0.0000e+00
time in the BLAS: CPU   3.7678e+00 GPU   0.0000e+00 total:   3.7678e+00
assembly time   0.0000e+00    0.0000e+00

---------------------------------- cholmod_l_demo:
cholmod version 3.0.14
SuiteSparse version 5.12.0
norm (A,inf) = 203.333
norm (A,1)   = 203.333
CHOLMOD sparse:  A:  18000-by-18000, nz 3457658, upper.  OK
CHOLMOD dense:   B:  18000-by-1,   OK
bnorm 1.99994
Analyze: flop 1.15165e+11 lnz 4.07336e+07
Factorizing A
CHOLMOD factor:  L:  18000-by-18000  supernodal, LL'.  nz 41793167  OK
nmethods: 1
Ordering: AMD     fl/lnz     3911.5  lnz/anz       14.8
Ordering: METIS   fl/lnz     2827.3  lnz/anz       11.8
ints in L:          212740, doubles in L:        55587325
factor flops 1.15165e+11 nnz(L)        40733584 (w/no amalgamation)
nnz(A*A'):         3457658
flops / nnz(L):    2827.3
nnz(L) / nnz(A):     11.8
analyze cputime:        0.9847
factor  cputime:         8.2289 mflop:  13995.3
solve   cputime:         0.0376 mflop:   4335.6
overall cputime:         9.2511 mflop:  12466.4
solve   cputime:         0.0410 mflop:   3969.8 (100 trials)
solve2  cputime:         0.0000 mflop:      0.0 (100 trials)
peak memory usage:          631 (MB)
residual (|Ax-b|/(|A||x|+|b|)): 1.60e-15 2.58e-15 
residual  1.5e-16 (|Ax-b|/(|A||x|+|b|)) after iterative refinement
rcond     4.9e-04


CHOLMOD GPU/CPU statistics:
SYRK  CPU calls          799 time   1.9403e+00
      GPU calls            0 time   0.0000e+00
GEMM  CPU calls          628 time   6.2919e-01
      GPU calls            0 time   0.0000e+00
POTRF CPU calls          172 time   7.3685e-01
      GPU calls            0 time   0.0000e+00
TRSM  CPU calls          171 time   2.8382e-01
      GPU calls            0 time   0.0000e+00
time in the BLAS: CPU   3.5902e+00 GPU   0.0000e+00 total:   3.5902e+00
assembly time   0.0000e+00    0.0000e+00



[1]https://answers.launchpad.net/yade/+question/685647

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