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If Altera's example also fails on your device, the problem is somewhere else. The design readme says that it only works with Quartus/AOC v16.1 and a compatible BSP. From what I remember, you are using older versions and that is probably why it doesn't work for you.
It is hard to tell what is happening during that time gap without seeing the code. You should take this fact into consideration that if your kernel is very short, the overhead of going back to the host after kernel execution finishes, and relaunching it, might be higher than the kernel execution itself.
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Thanks for your reply!
After I remove --profile and recompile my kernel, the gaps seems disappear.
Yes, I also find the problem of multithread, my quartus version is not same as the readme says. Do you know anywhere have multithread sample I can use?
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