running lazy evaluation code example outputs "Illegal instruction"

[Maslino]

Environment info

Operating System:
CentOS Linux release 7.2.1511

Compiler:
gcc version 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC)

Package used (Python/R/Scala/Julia):
Python

MXNet version:
mxnet-cu80 (0.9.3a3)

CUDA version:
cuda 8.0.61
Nvidia driver 367.57
GPU Grid K1

Python version and distribution:
CPython 2.7.5

Error Message:

time for all computations are pushed into the backend engine:
0.001749 sec
Illegal instruction

Minimum reproducible example

the following code is copied from mxnet tutorial:

# @@@ AUTOTEST_OUTPUT_IGNORED_CELL
import time

def do(x, n):
    """push computation into the backend engine"""
    return [mx.nd.dot(x,x) for i in range(n)]
def wait(x):
    """wait until all results are available"""
    for y in x:
        y.wait_to_read()
        
tic = time.time()
a = mx.nd.ones((1000,1000))
b = do(a, 50)
print('time for all computations are pushed into the backend engine:\n %f sec' % (time.time() - tic))
wait(b)
print('time for all computations are finished:\n %f sec' % (time.time() - tic))

Steps to reproduce

just run the code above

What have you tried to solve it?

I'm not sure what's going on. What maybe the problem?

[Maslino]

I tried in ipython:

In [1]: import mxnet as mx

In [2]: a = mx.nd.ones((1000, 1000))

In [3]: mx.nd.dot(a, a)
Out[3]: <NDArray 1000x1000 @cpu(0)>

Illegal instruction

The problem seems related with matrix multiplication.

[yajiedesign]

This issue is closed due to lack of activity in the last 90 days. Feel free to reopen if this is still an active issue. Thanks!

[eric-haibin-lin]

What version of openblas did you use? I've seen similar error when a buggy version of openblas was used.