Deno: TextDecoder iso-8859-1: Fatal javascript OOM in Ineffective mark-compacts near heap limit

[kemicofa]

I'm workiing with very large CSV files (85Mo). After opening the file with Deno.readFile, I decode it with new TextDecoder("iso-8859-1").decode(rawData); and get the following error:

note: I do not get this error with utf-8

<--- Last few GCs --->

[17822:0x5400000000] 27318 ms: Mark-sweep (reduce) 1399.4 (1401.5) -> 1399.3 (1403.2) MB, 3173.1 / 0.0 ms (+ 0.1 ms in 431 steps since start of marking, biggest step 0.0 ms, walltime since start of marking 3424 ms) (average mu = 0.191, current mu = 0.[17822:0x5400000000] 30483 ms: Mark-sweep (reduce) 1399.8 (1401.7) -> 1399.5 (1402.5) MB, 3164.5 / 0.0 ms (average mu = 0.100, current mu = 0.000) allocation failure scavenge might not succeed

<--- JS stacktrace --->

#
# Fatal javascript OOM in Ineffective mark-compacts near heap limit
#
[1] 17822 illegal hardware instruction

Deno Version: 1.2.2
Mac OS: 10.14.6
RAM: 16 Gb

[bartlomieju]

Seems like a bug in TextDecoder implementation in https://github.com/denoland/deno/blob/master/op_crates/web/08_text_encoding.js

[kemicofa]

Running with --v8-flags=--max-old-space-size=8192 temporarily fixes the issue.

[stonetwig]

This is not really an issue but the docs for it can be improved, that's why I created #7084

[ry]

It would help us debug if we had a small example script.