Don't spend build time optimizing build-time-only crates #2
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Crates used exclusively at build time, such as proc-macro crates and their dependencies, don't benefit substantially from optimization; they take far longer to optimize than time saved when running them during the build. No machine code from these crates will appear in the final compiled binary. Use the new profile-overrides mechanism in Rust 1.41 (https://doc.rust-lang.org/cargo/reference/profiles.html#overrides) to build such crates with opt-level 0. This substantially speeds up build time.
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On a 96-way system, this reduced compilation time from: to |
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Thank you so much for this contribution! You see I have tried to control dependencies during every step I make, but this kind of optimization is new to me and so impactful! |
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@joshtriplett Thread limiting is now available in |
Byron
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Aug 2, 2022
merge 'main' into 'write-index-files'
Byron
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Oct 15, 2023
The new URL should trigger an overflow check but it only
happens when `url::Url::parse()` is called directly as our
code doesn't let it through anymore.
Here is the log from the fuzzer run as reported:
```
[Environment] ASAN_OPTIONS=handle_abort=2
+----------------------------------------Release Build Stacktrace----------------------------------------+
Command: /mnt/scratch0/clusterfuzz/resources/platform/linux/unshare -c -n /mnt/scratch0/clusterfuzz/bot/builds/clusterfuzz-builds_gitoxide_9a561c2a19701ceb3cded247e9ae8f349711bbca/revisions/gix-url-parse -rss_limit_mb=2560 -timeout=60 -runs=100 /mnt/scratch0/clusterfuzz/bot/inputs/fuzzer-testcases/f508abd59698de9914f2b8894cc135f55208e494873d456c6c19828509103805
Time ran: 0.12717413902282715
INFO: Running with entropic power schedule (0xFF, 100).
INFO: Seed: 1001182178
INFO: Loaded 1 modules (90683 inline 8-bit counters): 90683 [0x5d0c0597cce0, 0x5d0c05992f1b),
INFO: Loaded 1 PC tables (90683 PCs): 90683 [0x5d0c05992f20,0x5d0c05af52d0),
/mnt/scratch0/clusterfuzz/bot/builds/clusterfuzz-builds_gitoxide_9a561c2a19701ceb3cded247e9ae8f349711bbca/revisions/gix-url-parse: Running 1 inputs 100 time(s) each.
Running: /mnt/scratch0/clusterfuzz/bot/inputs/fuzzer-testcases/f508abd59698de9914f2b8894cc135f55208e494873d456c6c19828509103805
thread '<unnamed>' panicked at /rust/registry/src/index.crates.io-6f17d22bba15001f/idna-0.4.0/src/punycode.rs:272:17:
attempt to add with overflow
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
AddressSanitizer:DEADLYSIGNAL
=================================================================
==1200==ERROR: AddressSanitizer: ABRT on unknown address 0x0539000004b0 (pc 0x7c51742fb00b bp 0x7ffcd1eadd80 sp 0x7ffcd1eadaf0 T0)
#0 0x7c51742fb00b in raise /build/glibc-SzIz7B/glibc-2.31/sysdeps/unix/sysv/linux/raise.c:51:1
#1 0x7c51742da858 in abort /build/glibc-SzIz7B/glibc-2.31/stdlib/abort.c:79:7
#2 0x5d0c0572a1e6 in std::sys::unix::abort_internal::he854d2f74b119e66 /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/std/src/sys/unix/mod.rs:375:14
#3 0x5d0c0518cda6 in std::process::abort::h68c27a968dc7c74f /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/std/src/process.rs:2271:5
#4 0x5d0c0564d3d4 in libfuzzer_sys::initialize::_$u7b$$u7b$closure$u7d$$u7d$::h1e76e422e0c48db0 /rust/registry/src/index.crates.io-6f17d22bba15001f/libfuzzer-sys-0.4.3/src/lib.rs:57:9
#5 0x5d0c0571dcf7 in _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..Fn$LT$Args$GT$$GT$::call::h0c028c5af3475e03 /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/alloc/src/boxed.rs:2021:9
#6 0x5d0c0571dcf7 in std::panicking::rust_panic_with_hook::hd26c5407fbf20d71 /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/std/src/panicking.rs:735:13
#7 0x5d0c0571da05 in std::panicking::begin_panic_handler::_$u7b$$u7b$closure$u7d$$u7d$::h944e23ea90982f5a /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/std/src/panicking.rs:601:13
#8 0x5d0c0571aee5 in std::sys_common::backtrace::__rust_end_short_backtrace::h8a3632d339dd3313 /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/std/src/sys_common/backtrace.rs:170:18
#9 0x5d0c0571d781 in rust_begin_unwind /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/std/src/panicking.rs:597:5
#10 0x5d0c05190634 in core::panicking::panic_fmt::h85c36fc727234039 /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/core/src/panicking.rs:72:14
#11 0x5d0c051906d2 in core::panicking::panic::h6a47ed7881a36f4d /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/core/src/panicking.rs:127:5
#12 0x5d0c053e09c6 in idna::punycode::encode_into::hd674630fb161bf5b /rust/registry/src/index.crates.io-6f17d22bba15001f/idna-0.4.0/src/punycode.rs:0
#13 0x5d0c053eacbc in idna::uts46::Idna::to_ascii_inner::h69c52eb69ae48276 /rust/registry/src/index.crates.io-6f17d22bba15001f/idna-0.4.0/src/uts46.rs:469:34
#14 0x5d0c053eb793 in idna::uts46::Idna::to_ascii::h76237795045112f3 /rust/registry/src/index.crates.io-6f17d22bba15001f/idna-0.4.0/src/uts46.rs:481:26
#15 0x5d0c053eda7a in idna::uts46::Config::to_ascii::h423c722ab2fa9813 /rust/registry/src/index.crates.io-6f17d22bba15001f/idna-0.4.0/src/uts46.rs:572:9
#16 0x5d0c053f0070 in idna::domain_to_ascii::h93e94e995d03e9ef /rust/registry/src/index.crates.io-6f17d22bba15001f/idna-0.4.0/src/lib.rs:64:5
#17 0x5d0c0530374a in url::host::Host::domain_to_ascii::h6cb1ae8fe42a1e42 /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/host.rs:166:9
#18 0x5d0c0530374a in url::host::Host::parse::h962d3990e0ff5091 /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/host.rs:86:22
#19 0x5d0c0532e87d in url::parser::Parser::parse_host::h89faea9182ce2512 /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/parser.rs:1024:20
#20 0x5d0c0532ba8d in url::parser::Parser::parse_host_and_port::heb44bd7ebd2593f6 /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/parser.rs:944:33
#21 0x5d0c0532896f in url::parser::Parser::after_double_slash::hbb313f562f0978a2 /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/parser.rs:843:13
#22 0x5d0c0531a129 in url::parser::Parser::parse_with_scheme::h54a417e4650ea024 /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/parser.rs:453:17
#23 0x5d0c05317824 in url::parser::Parser::parse_url::hfa6b21c53cd0ac1c /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/parser.rs:366:20
#24 0x5d0c05350ba0 in url::ParseOptions::parse::hb8b3309b3b920457 /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/lib.rs:257:9
#25 0x5d0c052b1ffc in url::Url::parse::h82a965c69df59bba /rust/registry/src/index.crates.io-6f17d22bba15001f/url-2.4.1/src/lib.rs:292:9
#26 0x5d0c052b1ffc in gix_url::parse::input_to_utf8_and_url::h14b70a32a8884316 gitoxide/gix-url/src/parse.rs:252:5
#27 0x5d0c052a9b9d in gix_url::parse::url::h6f7f7b0bddf4b8d7 gitoxide/gix-url/src/parse.rs:99:24
#28 0x5d0c052b34cc in gix_url::parse::hfaab74909f01c9cc gitoxide/gix-url/src/lib.rs:38:46
#29 0x5d0c05270b4a in rust_fuzzer_test_input gitoxide/gix-url/fuzz/fuzz_targets/parse.rs:5:14
#30 0x5d0c0564d537 in __rust_try libfuzzer_sys.f28e88650cadb2d4-cgu.0:0
#31 0x5d0c0564c79f in std::panicking::try::h90783eeef7e35925 /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/std/src/panicking.rs:468:19
#32 0x5d0c0564c79f in std::panic::catch_unwind::h041b281a0e92d580 /rustc/e20cb7702117f1ad8127a16406ba9edd230c4f65/library/std/src/panic.rs:142:14
#33 0x5d0c0564c79f in LLVMFuzzerTestOneInput /rust/registry/src/index.crates.io-6f17d22bba15001f/libfuzzer-sys-0.4.3/src/lib.rs:28:22
#34 0x5d0c0566bb83 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#35 0x5d0c056572e2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
#36 0x5d0c0565cb8c in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9
#37 0x5d0c056860c2 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
#38 0x7c51742dc082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/libc-start.c:308:16
#39 0x5d0c05191c4d in _start
```
`
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Crates used exclusively at build time, such as proc-macro crates and
their dependencies, don't benefit substantially from optimization; they
take far longer to optimize than time saved when running them during the
build. No machine code from these crates will appear in the final
compiled binary.
Use the new profile-overrides mechanism in Rust 1.41
(https://doc.rust-lang.org/cargo/reference/profiles.html#overrides) to
build such crates with opt-level 0.
This substantially speeds up build time.