How to solve error: "Clock skew detected"?

Question

I am uploading my OpenCL and Cuda code to hgpu.org because I don't have a graphics card on my laptop. When I upload my code I get the following error:

make: Warning: File `main.cu' has modification time 381 s in the future
make: warning:  Clock skew detected.  Your build may be incomplete.

I know that clock skew is due to difference in my machines clock time and the server's clock time, so I synchronized my time with the server's. The OpenCL and C++ code is running fine now but the Cuda code is still giving me this error.

So my question is:

Is there any other reason for clock skew error besides the time synchronization? And if there is then how do I solve it?

Cuda Code:

__global__
void test()
{
}

int main()
{
    dim3 gridblock(1,1,1);
    dim3 threadblock(1,1,1);

    test<<<gridblock,threadblock>>>();
    return 0;
}

Note: I can provide the make file too.

score 7 · Answer 1 · edited Nov 23 '14 at 01:28

7

Simply go to the directory where the troubling file is, type touch * without quotes in the console, and you should be good.

edited Nov 23 '14 at 01:28

answered Nov 23 '14 at 00:45

Nerox

89
1
3

3

And update the timestamps of all the files in that directory ? Isn't that a bit dangerous, especially if accidentally done in the wrong directory ? – Nov 23 '14 at 01:28

zindarod · Accepted Answer · 2017-04-11T13:20:38.887

4

I am going to answer my own question.

I added the following lines of code to my Makefile and it fixed the "clock skew" problem:

clean:  
    find . -type f | xargs touch
    rm -rf $(OBJS)

edited Apr 11 '17 at 13:20

answered Dec 31 '14 at 11:52

zindarod

5,532
2
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16

This only treats the symptom and not the underlaying cause, it doesn't "fix" the problem. If someone else has this problem, please don't do this! – RolKau Jun 06 '17 at 09:19
2

@RolKau What do you think the problem is? – zindarod Jun 07 '17 at 00:52

score 4 · Answer 3 · edited Mar 24 '17 at 10:52

4

One of the reason may be improper date/time of your PC.

In Ubuntu PC to check the date and time using:

date

Example, One of the ways to update date and time is:

date -s "23 MAR 2017 17:06:00"

edited Mar 24 '17 at 10:52

jmlemetayer

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answered Mar 23 '17 at 11:45

Nitesh Shetty

61
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2

match this situation, correct system time, problem resolved. : ) – yurenchen Nov 04 '17 at 09:35

score 1 · Answer 4 · edited Dec 18 '17 at 15:26

1

please try to do

make clean

(instead of make), then

make

again.

edited Dec 18 '17 at 15:26

Paul Roub

35,100
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answered Dec 18 '17 at 15:20

Sean

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7

How to solve error: "Clock skew detected"?

4 Answers4

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