Re: Default optimization of rust ports

On 2022-09-13 11:54, Nuno Teixeira wrote:

> Hi,
> 
> I think this issue is related to what happened in terms of 
> optimizations in go 1.18.3_1: ---
> Add amd64 microarchitecture level knobs for the Go compiler. Note that
> this will affect only the compiler itself, port users will still need 
> to
> set GOAMD64 in the environment to adjust the microarchitecture of the
> compiled code
> ---
> I've found this optimizations interesting, e.g.:
> ---
> The current high level steps to reduce binary size are:
> 
> * Use Rust 1.32.0 or newer (which doesn't include jemalloc by default)
> * Add the following to Cargo.toml [2]:
> 
> [profile.release]
> opt-level = 'z'     # Optimize for size.
> lto = true          # Enable Link Time Optimization
> codegen-units = 1   # Reduce number of codegen units to increase 
> optimizations.
> panic = 'abort'     # Abort on panic
> strip = true        # Strip symbols from binary*
> 
> *strip = true requires Rust 1.59+. On older Rust versions, run strip 
> manually on the resulting binary.
> ---
> 
> I was searching for cargo stripping instead of using STRIP_CMD and I 
> found this but this means that we have to hack ports Cargo.toml's or 
> should be upstream to implement a [profile.release]?
> 
> Cheers,
> 
> Mark Millard <marklmi@yahoo.com> escreveu no dia sábado, 10/09/2022 
> à(s) 12:53:
> 
>> Daniel Engberg <diizzy_at_FreeBSD.org> wrote on
>> Date: Sat, 10 Sep 2022 09:45:21 UTC :
>> 
>>> Since there is work and general interest regarding optimization would 
>>> it
>>> make sense to make LTO and possibly CODEGEN_UNITS=1 opt-out while we
>>> still have a fairly manageable amount of ports using Rust?
>> 
>> Just making sure I understand the wording:
>> 
>> So, in part, you are requesting that the FreeBSD build servers build
>> using LTO and CODEGEN_UNITS=1? (Those build servers always use the
>> defaults as I understand. Thus, the defaults are set to what is
>> desired for use on the build servers, if I understand right. Other
>> contexts that happen to want something different override some
>> default(s): opt out of the defaults.)
>> 
>> ===
>> Mark Millard
>> marklmi at yahoo.com [1]
> 
> --
> 
> Nuno Teixeira
> FreeBSD Committer (ports)
> 
> Hi,
> 
> The suggestion is to make it default for all ports but we can (and 
> should) make it opt-out as not all outcomes might be favourable.
> These are ENV variables so one wouldn't need to touch induvidual ports.
> 
> Best regards,
> Daniel



Links:
------
[1] http://yahoo.com
[2] https://doc.rust-lang.org/cargo/reference/manifest.html