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Change to using std::min() when allocating Buffers #73

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doggkruse
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This will result in Buffers being allocated to the size requested up to kMaxLength (0x3fffffff) instead of the current behavior of always allocating kMaxLength. Since these buffers are allocated in the node external memory (limited to 64M) the old behavior would very quickly cause massive GC pressure as the GC is triggered on each new Buffer allocation once the node external memory limit is reached. It appears the old behavior was not intentional and should have always been std::min(). This should fix #72

…his will result in Buffers being allocated to the size requested up to kMaxLength (0x3fffffff) instead of the current behavior of always allocating kMaxLength. Since these buffers are allocated in the node external memory (limited to 64M) the old behavior would very quickly cause massive GC pressure as the GC is triggered on each new Buffer allocation once the node external memory limit is reached. It appears the old behavior was not intentional and should have always been std::min(). This should fix node-ffi-napi#72
…an the current request. This is likely what drove the problematic max size allocation
@genaris
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genaris commented Jan 19, 2023

@addaleax by chance is it possible this to be reviewed and/or merged? It's solving our performance issues in Node.Js 18. However, as @blattersturm mentioned in #72, in Node 14 and 16 does not work because it's throwing Check failed: result.second. Maybe something that has been fixed in recent v8 engine but not back-ported? If you have any hint or guidance about to make it work in all Node versions I'd really appreciate. Thanks!

genaris added a commit to 2060-io/ref-napi that referenced this pull request Feb 6, 2023
NOTE: ref-napi now requires node >= 18, as this is not working in previous versions

Signed-off-by: Ariel Gentile <[email protected]>
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std::max(..., kMaxLength leads to massive GC pressure
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