A Deep Introduction to JIT Compilers: JITs are not very Just-in-time

Re:A Deep Introduction to JIT Compilers: JITs are not very J... by saagarjha on Sunday July 05, 2020 @07:24PM (#23743070)

The one problem with LLVM is that it’s not very well suited to JIT compilers, a major component of which is its slowness.

[ Parent | on HN ]

Re:A Deep Introduction to JIT Compilers: JITs are not very J... by dougqh2 on Monday July 06, 2020 @11:38AM (#23749032)

Former Azul employee here

Absolutely correct that LLVM is a fair amount slower than C1 or C2. Azul augmented our JITs with a compilation recording & replay mechanism to combat the general start-up problems posed by JITs (including Falcon).

For those who are curious, here's my presentation on the topic: https://2018.jpoint.ru/en/talks/63npsyjpokmukqsag80oia/.

[ Parent | on HN ]

Re:A Deep Introduction to JIT Compilers: JITs are not very J... by monadic2 on Sunday July 05, 2020 @11:17PM (#23744360)

That’s not really accurate. It has strict requirements about stack traversal required to appropriately trace memory roots. This is incidental to JIT vs AOT.

[ Parent | on HN ]

Re:A Deep Introduction to JIT Compilers: JITs are not very J... by saagarjha on Monday July 06, 2020 @02:16AM (#23745188)

Did you reply to the wrong comment?

[ Parent | on HN ]

Re:A Deep Introduction to JIT Compilers: JITs are not very J... by monadic2 on Tuesday July 07, 2020 @02:24AM (#23756290)

Sorry, what did you read?

[ Parent | on HN ]

Re:A Deep Introduction to JIT Compilers: JITs are not very J... by saagarjha on Tuesday July 07, 2020 @02:46AM (#23756404)

This comment: https://news.ycombinator.com/item?id=23744360, where you're talking about JIT vs AOT in response to my LLVM one. I couldn't really understand how it followed.

[ Parent | on HN ]