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remove recursion from VMInputStream #2816

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@hduelme hduelme commented Aug 12, 2024

What it does

Currently VMInputStream uses recursion to retry reads in the int read() method. I replaced the recursive call with a while loop. This removes unnecessary overhead while running tests.

How to test

This doesn't change any behavior.

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@stephan-herrmann
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This removes unnecessary overhead while running tests.

Can you give numbers for this overhead?

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hduelme commented Aug 14, 2024

I did some testing. If the build is successful no recursive calls happen. Only if something is written to the errorStream the IOException is thrown. In this case a found between 10 to 500 recursive calls.

@stephan-herrmann
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In this case a found between 10 to 500 recursive calls.

What's wrong with that?

When you said "overhead" I was expecting some time measurements... a recursive call is not overhead per se.

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hduelme commented Aug 16, 2024

I agree. I was also expecting different results. I got here in the first place due to a exception with a large stacktrace

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