Cusolver syevd samples has different output from official

Accelerated Computing GPU-Accelerated Libraries
1

Hi, I run the official syevd samples on Github.

And my output is below:

$ ./svd 
A = (matlab base-1)
3.50 0.50 0.00 
0.50 3.50 0.00 
0.00 0.00 2.00 
=====
after syevd: info = 0
eigenvalue = (matlab base-1), ascending order
W[1] = 2.000000E+00
W[2] = 3.000000E+00
W[3] = 4.000000E+00
V = (matlab base-1)
0.00 0.71 0.71 
0.00 -0.71 0.71 
1.00 0.00 0.00 
=====
|lambda - W| = 0.000000E+00

And the official output is

A = (matlab base-1)
3.50 0.50 0.00
0.50 3.50 0.00
0.00 0.00 2.00
=====
after syevd: info = 0
eigenvalue = (matlab base-1), ascending order
W[1] = 2.000000E+00
W[2] = 3.000000E+00
W[3] = 4.000000E+00
V = (matlab base-1)
0.00 -0.71 0.71
0.00 0.71 0.71
1.00 0.00 0.00
=====
|lambda - W| = 0.000000E+00

As you can see, the eigen vector V is a little different, but I modify nothing with the sample.

My enviroment is here:

$ nvidia-smi 
Fri Dec 16 10:57:19 2022       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 520.61.05    Driver Version: 520.61.05    CUDA Version: 11.8     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  Quadro RTX 6000     On   | 00000000:01:00.0  On |                  Off |
| 33%   35C    P8    33W / 260W |    362MiB / 24576MiB |      0%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A      1046      G   /usr/lib/xorg/Xorg                 39MiB |
|    0   N/A  N/A      3870      G   /usr/lib/xorg/Xorg                 81MiB |
|    0   N/A  N/A      3997      G   /usr/bin/gnome-shell               61MiB |
|    0   N/A  N/A     71108      G   /usr/lib/xorg/Xorg                 39MiB |
|    0   N/A  N/A     72218      G   ...,SameSiteByDefaultCookies       61MiB |
+-----------------------------------------------------------------------------+

So what is the problem here?

2

Could be a bug. Please file an issue on github

3

My issue is here.

And it seems there is an issue kinda like mine and hasn’s solved till now.

1 Like