Why is Arrays.fill 265 times slower on G1GC?

Re:Why is Arrays.fill 265 times slower on G1GC? by hyperpape on Friday September 04, 2026 @10:07AM (#49564870)

> This article is the story of chasing that number down to a single machine instruction, and then finding out that the instruction was only half of the answer.

> So the difference has to be in what the JIT generated, and the profiler gives us exactly that.

> That is the whole vocabulary. Let’s read some code.

> Decoding the x86 version instruction by instruction is out of scope here.

> What is not architecture specific is the logic.

Here’s a segment flagged by Pangram: https://www.pangram.com/history/87e25169-30a4-4030-a65a-dba8...

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Re:Why is Arrays.fill 265 times slower on G1GC? by anamexis on Friday September 04, 2026 @10:30AM (#49565212)

I don't know if it's AI or not, but if it is, it isn't egregious, and certainly not "garbage" or disrespectful to the reader.

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Re:Why is Arrays.fill 265 times slower on G1GC? by hyperpape on Friday September 04, 2026 @11:31AM (#49566106)

I will admit I shouldn’t have said “garbage”, because it is too emotional.

But I absolutely think it is bad for the reader, and deserves to be called out. Authors should know that it’s not good enough.

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Re:Why is Arrays.fill 265 times slower on G1GC? by xpct on Friday September 04, 2026 @10:46AM (#49565444)

I don't think the Pangram result is shareable to others.

"If you are sure the link is correct, please make sure you are logged in with the account associated with this result."

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Re:Why is Arrays.fill 265 times slower on G1GC? by Capricorn2481 on Friday September 04, 2026 @10:52AM (#49565536)

Even if that were AI (and I think there are better examples in the article to indicate that it is), why do you care if you just used AI anyway to summarize it anyway?

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Re:Why is Arrays.fill 265 times slower on G1GC? by hyperpape on Friday September 04, 2026 @11:00AM (#49565650)

I don’t really care that it’s AI, the problem is that it’s bad AI writing.

The summary I shared is much more straightforward. It’s mediocre, but just barely good enough to extract the message without making me super annoyed.

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