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Speed up light_compute by ~9%

This commit is contained in:
Vurich 2017-07-18 15:38:10 +02:00
parent 410ded5d45
commit d51958dbf5
4 changed files with 43 additions and 6 deletions
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7
Cargo.lock generated
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@ -254,6 +254,11 @@ name = "crossbeam"
version = "0.2.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "crunchy"
version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "crypt32-sys"
version = "0.2.0"
@ -360,6 +365,7 @@ dependencies = [
name = "ethash"
version = "1.7.0"
dependencies = [
"crunchy 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"log 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
"parking_lot 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
"primal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
@ -2943,6 +2949,7 @@ dependencies = [
"checksum core-foundation 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "20a6d0448d3a99d977ae4a2aa5a98d886a923e863e81ad9ff814645b6feb3bbd"
"checksum core-foundation-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "05eed248dc504a5391c63794fe4fb64f46f071280afaa1b73308f3c0ce4574c5"
"checksum crossbeam 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "0c5ea215664ca264da8a9d9c3be80d2eaf30923c259d03e870388eb927508f97"
"checksum crunchy 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b56bdac907d4b64254aed43964b11dd334bc46e0826a0e3add75caddfaf90175"
"checksum crypt32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e34988f7e069e0b2f3bfc064295161e489b2d4e04a2e4248fb94360cdf00b4ec"
"checksum ctrlc 1.1.1 (git+https://github.com/paritytech/rust-ctrlc.git)" = "<none>"
"checksum daemonize 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "271ec51b7e0bee92f0d04601422c73eb76ececf197026711c97ad25038a010cf"

1
ethash/Cargo.toml
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@ -10,6 +10,7 @@ log = "0.3"
sha3 = { path = "../util/sha3" }
primal = "0.2.3"
parking_lot = "0.4"
crunchy = "0.1.0"
[features]
benches = []

39
ethash/src/compute.rs
View File

@ -287,12 +287,39 @@ fn hash_compute(light: &Light, full_size: usize, header_hash: &H256, nonce: u64)
let num_full_pages = (full_size / page_size) as u32;
let cache: &[Node] = &light.cache; // deref once for better performance
for i in 0..(ETHASH_ACCESSES as u32) {
let index = fnv_hash(f_mix.get_unchecked(0).as_words().get_unchecked(0) ^ i, *mix.get_unchecked(0).as_words().get_unchecked((i as usize) % MIX_WORDS)) % num_full_pages;
for n in 0..MIX_NODES {
let tmp_node = calculate_dag_item(index * MIX_NODES as u32 + n as u32, cache);
for w in 0..NODE_WORDS {
*mix.get_unchecked_mut(n).as_words_mut().get_unchecked_mut(w) = fnv_hash(*mix.get_unchecked(n).as_words().get_unchecked(w), *tmp_node.as_words().get_unchecked(w));
debug_assert_eq!(ETHASH_ACCESSES, 64);
debug_assert_eq!(MIX_NODES, 2);
debug_assert_eq!(NODE_WORDS, 16);
unroll! {
// ETHASH_ACCESSES
for i_usize in 0..64 {
let i = i_usize as u32;
let index = fnv_hash(
f_mix.get_unchecked(0).as_words().get_unchecked(0) ^ i,
*mix.get_unchecked(0).as_words().get_unchecked(i_usize % MIX_WORDS)
) % num_full_pages;
unroll! {
// MIX_NODES
for n in 0..2 {
let tmp_node = calculate_dag_item(
index * MIX_NODES as u32 + n as u32,
cache,
);
unroll! {
// NODE_WORDS
for w in 0..16 {
*mix.get_unchecked_mut(n).as_words_mut().get_unchecked_mut(w) =
fnv_hash(
*mix.get_unchecked(n).as_words().get_unchecked(w),
*tmp_node.as_words().get_unchecked(w),
);
}
}
}
}
}
}

2
ethash/src/lib.rs
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@ -22,6 +22,8 @@ extern crate primal;
extern crate sha3;
extern crate parking_lot;
#[macro_use]
extern crate crunchy;
#[macro_use]
extern crate log;
mod compute;