nushell/crates/nu-command/src/platform
Stefan Holderbach a52386e837
Box ShellError in Value::Error (#8375)
# Description

Our `ShellError` at the moment has a `std::mem::size_of<ShellError>` of
136 bytes (on AMD64). As a result `Value` directly storing the struct
also required 136 bytes (thanks to alignment requirements).

This change stores the `Value::Error` `ShellError` on the heap.

Pro:
- Value now needs just 80 bytes
- Should be 1 cacheline less (still at least 2 cachelines)

Con:
- More small heap allocations when dealing with `Value::Error`
  - More heap fragmentation
  - Potential for additional required memcopies

# Further code changes

Includes a small refactor of `try` due to a type mismatch in its large
match.

# User-Facing Changes

None for regular users.

Plugin authors may have to update their matches on `Value` if they use
`nu-protocol`

Needs benchmarking to see if there is a benefit in real world workloads.
**Update** small improvements in runtime for workloads with high volume
of values. Significant reduction in maximum resident set size, when many
values are held in memory.

# Tests + Formatting
2023-03-12 09:57:27 +01:00
..
ansi Box ShellError in Value::Error (#8375) 2023-03-12 09:57:27 +01:00
reedline_commands Uniformize usage() and extra_usage() message ending for commands helper. (#8268) 2023-02-28 21:33:02 -08:00
clear.rs Add more input/output type annotations (#7532) 2022-12-21 20:20:46 +01:00
dir_info.rs Further cleanup of Span::test_data usage + span fixes (#7595) 2022-12-24 07:41:57 -06:00
du.rs Box ShellError in Value::Error (#8375) 2023-03-12 09:57:27 +01:00
input.rs interrupt input command with Ctrl + C (#8159) 2023-02-22 17:19:19 +00:00
kill.rs Add more input/output type annotations (#7532) 2022-12-21 20:20:46 +01:00
mod.rs Ansi link (#7751) 2023-01-15 17:23:37 +02:00
sleep.rs Add helper method to check whether ctrl+c was pressed, adopt it (#7482) 2022-12-15 09:39:24 -08:00
term_size.rs Uniformize usage() and extra_usage() message ending for commands helper. (#8268) 2023-02-28 21:33:02 -08:00