Remove all cryptoxide calls from fake_full_tx() (#286) #322
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Profiling the tx builder showed that even after we removed the fake_key_root construction in #214 due to terrible performance in asm.js (#213) that the cryptoxide calls within `fake_full_tx()` were up a ridiculous amount of the runtime. I investigated this as we had a report that it was taking up to hundreds of milliseconds just to make a tx and I wanted to see if there would be any significant improvement by migrating to an idiomatic rust API as discussed in #276 but from a purely performance perspective in a release build (opt-level=3) this seemed to be pretty minor, even with the unnecessary cloning forced by this inside of the implementation. This will need to be slightly modified once #273 gets merged as there are some conflicts. Previous perf results from building 100,000 simple txs and serializing them: ``` - 53.64% [.] <&cryptoxide::curve25519::Fe as core::ops::arith::Mul>::mul - 53.63% 0xffffffffffffffff + 23.03% cardano_serialization_lib::tx_builder::min_fee - 21.32% cardano_serialization_lib::tx_builder::TransactionBuilder::add_change_if_needed - 15.21% cardano_serialization_lib::tx_builder::TransactionBuilder::fee_for_output cardano_serialization_lib::tx_builder::min_fee + cardano_serialization_lib::tx_builder::fake_full_tx + 6.11% cardano_serialization_lib::tx_builder::TransactionBuilder::min_fee (inlined) - 7.78% ser_lib_perf::main + 6.11% cardano_serialization_lib::tx_builder::TransactionBuilder::build + 1.67% cardano_serialization_lib::tx_builder::TransactionBuilder::add_change_if_needed + 1.46% std::rt::lang_start_internal - 19.40% [.] cryptoxide::curve25519::Fe::square - 0xffffffffffffffff - 8.34% cardano_serialization_lib::tx_builder::min_fee cardano_serialization_lib::tx_builder::TransactionBuilder::build cardano_serialization_lib::tx_builder::TransactionBuilder::build_and_size + cardano_serialization_lib::tx_builder::fake_full_tx - 7.41% cardano_serialization_lib::tx_builder::TransactionBuilder::add_change_if_needed + 5.58% cardano_serialization_lib::tx_builder::TransactionBuilder::fee_for_output + 1.83% cardano_serialization_lib::tx_builder::TransactionBuilder::min_fee (inlined) + 2.77% ser_lib_perf::main + 0.88% std::rt::lang_start_internal + 7.80% [.] cryptoxide::curve25519::GePrecomp::maybe_set + 5.13% [.] cryptoxide::curve25519::Fe::invert + 3.98% [.] <&cryptoxide::curve25519::GeP3 as core::ops::arith::Add<&cryptoxide::curve25519::GePrecomp>>::add + 2.84% [.] cryptoxide::curve25519::GePrecomp::select + 1.22% [.] cryptoxide::curve25519::ge_scalarmult_base + 1.00% [.] cryptoxide::sha2::impl512::reference::digest_block_u64 0.47% [.] cryptoxide::curve25519::GeP2::dbl 0.13% [.] cryptoxide::curve25519::sc_muladd 0.12% [.] cryptoxide::curve25519::Fe::to_bytes 0.12% [.] cryptoxide::curve25519::sc_reduce 0.10% [.] cbor_event::se::Serializer<W>::write_type 0.07% [.] cardano_serialization_lib::tx_builder::fake_full_tx ``` which shows that almost the entire runtime was spent on cryptoxide calls which were only necessary for `fake_full_tx()`. Running it again afterwards there is no overwhelming bottleneck anymore and the remaining runtime was fairly distributed. (cherry picked from commit e0b33c6)
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Backport of this change: #286