object-access experiment with brand new radicle link Sync ODB

It's undoubtedly super fast especially for being sync, just neglectably slower than a simple shared reference, amazing, AND faster than a shared reference though an Arc.

Sebastian Thiel committed 4 years ago

Commit 7eb41681 parent 3bc90943 files · +658 −81Browse files

Unified · Split

3 files

Cargo.lock +582 −79
experiments/object-access/Cargo.toml +5 −1
experiments/object-access/src/main.rs +71 −1

Cargo.lock+582−79

@@ -34,6 +34,12 @@ version = "1.0.47" · 33 unmodified lines
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@@ -1259,23 +1515,23 @@ dependencies = [ · 1 unmodified line
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	3102	+[[package]]
	3103	+name = "tracing"
	3104	+version = "0.1.29"
	3105	+source = "registry+https://github.com/rust-lang/crates.io-index"
	3106	+checksum = "375a639232caf30edfc78e8d89b2d4c375515393e7af7e16f01cd96917fb2105"
	3107	+dependencies = [
	3108	+ "cfg-if",
	3109	+ "pin-project-lite",
	3110	+ "tracing-attributes",
	3111	+ "tracing-core",
	3112	+]
	3113	+
	3114	+[[package]]
	3115	+name = "tracing-attributes"
	3116	+version = "0.1.18"
	3117	+source = "registry+https://github.com/rust-lang/crates.io-index"
	3118	+checksum = "f4f480b8f81512e825f337ad51e94c1eb5d3bbdf2b363dcd01e2b19a9ffe3f8e"
	3119	+dependencies = [
	3120	+ "proc-macro2",
	3121	+ "quote",
	3122	+ "syn",
	3123	+]
	3124	+
	3125	+[[package]]
	3126	+name = "tracing-core"
	3127	+version = "0.1.21"
	3128	+source = "registry+https://github.com/rust-lang/crates.io-index"
	3129	+checksum = "1f4ed65637b8390770814083d20756f87bfa2c21bf2f110babdc5438351746e4"
	3130	+dependencies = [
	3131	+ "lazy_static",
	3132	+]
	3133	+
2641	3134	[[package]]
2642	3135	name = "traversal"
2643	3136	version = "0.1.0"
2644	3137	dependencies = [
2645	3138	"anyhow",
2646	3139	"dashmap",
2647		− "git-repository",
	3140	+ "git-repository 0.13.0",
2648	3141	"git2",
2649	3142	"rayon",
2650	3143	]
@@ -2778,6 +3271,16 @@ version = "0.9.3" · 127 unmodified lines
2778	3271	source = "registry+https://github.com/rust-lang/crates.io-index"
2779	3272	checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
2780	3273
	3274	+[[package]]
	3275	+name = "versions"
	3276	+version = "3.0.3"
	3277	+source = "registry+https://github.com/rust-lang/crates.io-index"
	3278	+checksum = "5cd9a7a22c45daf5aeb6bea3dff4ecbb8eb43e492582d467b18ce2979b512cbe"
	3279	+dependencies = [
	3280	+ "itertools",
	3281	+ "nom",
	3282	+]
	3283	+
2781	3284	[[package]]
2782	3285	name = "waker-fn"
2783	3286	version = "1.1.0"

experiments/object-access/Cargo.toml+5−1

@@ -7,9 +7,13 @@ publish = false · 6 unmodified lines
7	7
8	8	# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
9	9
	10	+[features]
	11	+radicle-nightly = ["link-git"]
	12	+
10	13	[dependencies]
11	14	anyhow = "1"
12		−git-repository = { version ="^0.13.0", path = "../../git-repository", features = ["unstable"] }
	15	+git-repository = { version ="^0.13.0", features = ["unstable"] }
13	16	git2 = "0.13"
	17	+link-git = { git = "https://github.com/Byron/radicle-link.git", rev = "6c9ad7aeadcf2b04f87cc01c9825c472c3ba0911", optional = true }
14	18	rayon = "1.5.0"
15	19	parking_lot = { version = "0.11.0", default-features = false }

experiments/object-access/src/main.rs+71−1

@@ -1,7 +1,7 @@
1	1	use std::{path::Path, sync::Arc, time::Instant};
2	2
3	3	use anyhow::anyhow;
4		−use git_repository::{hash::ObjectId, odb, prelude::*, Repository};
	4	+use git_repository::{hash::ObjectId, odb, Repository};
5	5
6	6	const GITOXIDE_STATIC_CACHE_SIZE: usize = 64;
7	7	const GITOXIDE_CACHED_OBJECT_DATA_PER_THREAD_IN_BYTES: usize = 60_000_000;
@@ -32,6 +32,19 @@ fn main() -> anyhow::Result<()> { · 24 unmodified lines
32	32	objs_per_sec(elapsed)
33	33	);
34	34
	35	+ #[cfg(feature = "radicle-nightly")]
	36	+ {
	37	+ let start = Instant::now();
	38	+ do_link_git_in_parallel(&hashes, &repo, \|\| odb::pack::cache::Never, AccessMode::ObjectExists)?;
	39	+ let elapsed = start.elapsed();
	40	+ println!(
	41	+ "parallel radicle-link-git : confirmed {} objects exists in {:?} ({:0.0} objects/s)",
	42	+ hashes.len(),
	43	+ elapsed,
	44	+ objs_per_sec(elapsed)
	45	+ );
	46	+ }
	47	+
35	48	let start = Instant::now();
36	49	let bytes = do_gitoxide_in_parallel_through_arc(
37	50	&hashes,
@@ -47,6 +60,19 @@ fn main() -> anyhow::Result<()> { · 9 unmodified lines
47	60	objs_per_sec(elapsed)
48	61	);
49	62
	63	+ #[cfg(feature = "radicle-nightly")]
	64	+ {
	65	+ let start = Instant::now();
	66	+ let bytes = do_link_git_in_parallel(&hashes, &repo, odb::pack::cache::Never::default, AccessMode::ObjectData)?;
	67	+ let elapsed = start.elapsed();
	68	+ println!(
	69	+ "parallel radicle-link-git (uncached, Arc): confirmed {} bytes in {:?} ({:0.0} objects/s)",
	70	+ bytes,
	71	+ elapsed,
	72	+ objs_per_sec(elapsed)
	73	+ );
	74	+ }
	75	+
50	76	let start = Instant::now();
51	77	do_gitoxide_in_parallel_through_arc(
52	78	&hashes,
@@ -230,6 +256,7 @@ fn do_gitoxide<C>(hashes: &[ObjectId], repo: &Repository, new_cache: impl FnOnce · 177 unmodified lines
230	256	where
231	257	C: odb::pack::cache::DecodeEntry,
232	258	{
	259	+ use git_repository::prelude::FindExt;
233	260	let mut buf = Vec::new();
234	261	let mut bytes = 0u64;
235	262	let mut cache = new_cache();
@@ -254,6 +281,7 @@ fn do_gitoxide_in_parallel<C>( · 18 unmodified lines
254	281	where
255	282	C: odb::pack::cache::DecodeEntry,
256	283	{
	284	+ use git_repository::prelude::FindExt;
257	285	use rayon::prelude::*;
258	286	let bytes = std::sync::atomic::AtomicU64::default();
259	287	hashes.par_iter().try_for_each_init::<_, _, _, anyhow::Result<_>>(
@@ -275,6 +303,46 @@ where · 15 unmodified lines
275	303	Ok(bytes.load(std::sync::atomic::Ordering::Acquire))
276	304	}
277	305
	306	+/// A fully sync implementation but with interior mutability
	307	+#[cfg(feature = "radicle-nightly")]
	308	+fn do_link_git_in_parallel<C>(
	309	+ hashes: &[ObjectId],
	310	+ repo: &Repository,
	311	+ new_cache: impl Fn() -> C + Sync + Send,
	312	+ mode: AccessMode,
	313	+) -> anyhow::Result<u64>
	314	+where
	315	+ C: odb::pack::cache::DecodeEntry,
	316	+{
	317	+ use rayon::prelude::*;
	318	+ use std::iter::FromIterator;
	319	+ let bytes = std::sync::atomic::AtomicU64::default();
	320	+ let repo = link_git::odb::Odb {
	321	+ loose: link_git::odb::backend::Loose::at(repo.objects_dir()),
	322	+ packed: link_git::odb::backend::Packed {
	323	+ index: link_git::odb::index::Shared::from_iter(link_git::odb::index::discover(repo.git_dir())?),
	324	+ data: link_git::odb::window::Large::default(),
	325	+ },
	326	+ };
	327	+ hashes.par_iter().try_for_each_init::<_, _, _, anyhow::Result<_>>(
	328	+ \|\| (Vec::new(), new_cache()),
	329	+ \|(buf, cache), hash\| {
	330	+ match mode {
	331	+ AccessMode::ObjectData => {
	332	+ let obj = repo.find(hash, buf, cache)?.expect("exists");
	333	+ bytes.fetch_add(obj.data.len() as u64, std::sync::atomic::Ordering::Relaxed);
	334	+ }
	335	+ AccessMode::ObjectExists => {
	336	+ assert!(repo.contains(hash), "each traversed object exists");
	337	+ }
	338	+ }
	339	+ Ok(())
	340	+ },
	341	+ )?;
	342	+
	343	+ Ok(bytes.load(std::sync::atomic::Ordering::Acquire))
	344	+}
	345	+
278	346	fn do_gitoxide_in_parallel_through_arc<C>(
279	347	hashes: &[ObjectId],
280	348	repo: &Path,
@@ -284,6 +352,7 @@ fn do_gitoxide_in_parallel_through_arc<C>( · 3 unmodified lines
284	352	where
285	353	C: odb::pack::cache::DecodeEntry,
286	354	{
	355	+ use git_repository::prelude::FindExt;
287	356	let bytes = std::sync::atomic::AtomicU64::default();
288	357	let odb = Arc::new(git_repository::odb::linked::Store::at(repo)?);
289	358
@@ -319,6 +388,7 @@ fn do_gitoxide_in_parallel_through_arc_rw_lock<C>( · 29 unmodified lines
319	388	where
320	389	C: odb::pack::cache::DecodeEntry,
321	390	{
	391	+ use git_repository::prelude::FindExt;
322	392	let bytes = std::sync::atomic::AtomicU64::default();
323	393	let odb = Arc::new(parking_lot::RwLock::new(git_repository::odb::linked::Store::at(repo)?));
324	394