add --cuda-usleep flag to optionally usleep between search iterations

[jonreiter]

No description provided.

[aloisklink]

Hiya, I just wanted to thank you for adding this feature! I'll probably use it in my personal fork, since I've been wanting the same thing.

Unfortunately, this repo is pretty unmaintained, so it's unlikely for this PR to get merged, but I thought I'd add my recommended changes, just in case some fork wants to pick up this feature. I remember https://github.com/no-fee-ethereum-mining/nsfminer was a new fork that looked pretty promising, but unfortunately that's archived now.

[aloisklink]

It's probably worth improving the documentation on this, just to make it more clear what this actually does.

Suggested change

	app.add_option("--cuda-usleep,--cu-usleep", m_CUSettings.usleep, "", true)
	->check(CLI::Range(-1, 1000000));
	// adds an optional usleep between batches. Can be used to slow down mining.
	app.add_option("--cuda-usleep,--cu-usleep", m_CUSettings.usleep, "Sleep time in μs between batches (default: no sleep)", true)
	->check(CLI::Range(-1, 1000000));

[aloisklink]

C and C++ are annoying languages, and even though int is usually 32-bits large, on some platforms, it can be 16-bits, so it's better to use one of the types in <cstdint> instead.

The following should work if you include #include <cstdint> at the top of the file. Alternatively, you could replace the CLI::Range(-1, 1000000)) to a smaller range that will fit in a int16 like CLI::Range(-1, 10000)).

Suggested change

	int usleep = -1;
	int_fast32_t usleep = -1;