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vm: BigInt intrinsics can take quadratic time without checking for interrupts #47926

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rmacnak-google opened this issue Dec 14, 2021 · 1 comment
Open

vm: BigInt intrinsics can take quadratic time without checking for interrupts #47926

rmacnak-google opened this issue Dec 14, 2021 · 1 comment
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area-vm Use area-vm for VM related issues, including code coverage, FFI, and the AOT and JIT backends.

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@rmacnak-google
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rmacnak-google commented Dec 14, 2021 •
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If someone does a BigInt operation in a background isolate, the intrinsified operations can take quadratic time without checking for an interrupt / safepoint request. This can prevent a foreground isolate in the same group from reaching a safepoint and create arbitrarily long pauses.
@rmacnak-google rmacnak-google added the area-vm Use area-vm for VM related issues, including code coverage, FFI, and the AOT and JIT backends. label Dec 14, 2021
@rakudrama
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One way to avoid the issue is to not use the quadratic code for 'big' problems, e.g. switch to Karatsuba multiplication for bigger products.

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area-vm Use area-vm for VM related issues, including code coverage, FFI, and the AOT and JIT backends.
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