Boa's start-up time getting hit with GC Allocation about boa

[jasonwilliams]

I ran cargo run --profile=release-dbg --bin boa --features=dhat debug/script.js

Hello world!
undefined
dhat: Total:     611,648 bytes in 3,019 blocks
dhat: At t-gmax: 382,386 bytes in 2,283 blocks
dhat: At t-end:  354,488 bytes in 2,258 blocks

Also I've noticed that in DHAT we spend a lot of time growing the vector for property_table.

If we know ahead of time how many static methods are on a builtin, we should be passing this number through so it can create the vec::with_capacity(n)

[nekevss]

Raising the threshold at the below might help.

boa/core/gc/src/lib.rs

Line 66 in fc2a6e0

threshold: 1024,

[raskad]

Raising the threshold at the below might help.

boa/core/gc/src/lib.rs

Line 66 in fc2a6e0

threshold: 1024,

Yeah I also think we should raise the default threshold and make it configurable from outside of boa_gc.

[jasonwilliams]

We’re not able to set each property_table with a capacity right now due to the fact that for each template the inner shape is cloned from the first shape.

We may need to set new root shapes here, each one having its own set of prototype storage capacity and property capacity.

@HalidOdat thoughts?