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Re: [tor-bugs] #25269 [Core Tor/Tor]: Set codegen-units to 1 in src/rust/Cargo.toml to eke out every last drop of performance
#25269: Set codegen-units to 1 in src/rust/Cargo.toml to eke out every last drop of
performance
-------------------------------------------------+-------------------------
Reporter: cypherpunks | Owner:
| Backxwash
Type: enhancement | Status:
| needs_information
Priority: Medium | Milestone: Tor:
| 0.3.5.x-final
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: rust, easy, 034-triage-20180328, | Actual Points:
034-removed-20180328, fast-fix |
Parent ID: | Points: .1
Reviewer: nickm | Sponsor:
-------------------------------------------------+-------------------------
Comment (by isis):
Totally hand-wavey measurement in a Qubes VM on a x220 with an i5 using
turboboost doing like a million other things, running `configure --enable-
rust --enable-cargo-online-mode --enable-fatal-warnings --disable-asciidoc
&& time make -j4`:
With `codegen-units = 1`:
{{{
real 5m15.728s
user 14m29.903s
sys 3m55.476s
}}}
Without:
{{{
real 5m18.433s
user 15m15.399s
sys 4m12.781s
}}}
So it seems to have a negligible effect on build times if it randomly
ended up being longer without it? I don't know how much faster it makes
the binaries.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25269#comment:14>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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