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

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2064	name = "proc-macro2"	2494	name = "proc-macro2"
2065	version = "1.0.32"	2495	version = "1.0.32"
@@ -2128,7 +2558,7 @@ checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8" · 62 unmodified lines
2128	dependencies = [	2558	dependencies = [
2129	"libc",	2559	"libc",
2130	"rand_chacha",	2560	"rand_chacha",
2131	"rand_core",	2561	"rand_core 0.6.3",
2132	"rand_hc",	2562	"rand_hc",
2133	]	2563	]
2134		2564
@@ -2139,9 +2569,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index" · 4 unmodified lines
2139	checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"	2569	checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
2140	dependencies = [	2570	dependencies = [
2141	"ppv-lite86",	2571	"ppv-lite86",
2142	"rand_core",	2572	"rand_core 0.6.3",
2143	]	2573	]
2144		2574
		2575	[[package]]
		2576	name = "rand_core"
		2577	version = "0.5.1"
		2578	source = "registry+https://github.com/rust-lang/crates.io-index"
		2579	checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
		2580
2145	[[package]]	2581	[[package]]
2146	name = "rand_core"	2582	name = "rand_core"
2147	version = "0.6.3"	2583	version = "0.6.3"
@@ -2157,7 +2593,16 @@ version = "0.3.1" · 9 unmodified lines
2157	source = "registry+https://github.com/rust-lang/crates.io-index"	2593	source = "registry+https://github.com/rust-lang/crates.io-index"
2158	checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"	2594	checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"
2159	dependencies = [	2595	dependencies = [
2160	"rand_core",	2596	"rand_core 0.6.3",
		2597	]
		2598
		2599	[[package]]
		2600	name = "rand_xoshiro"
		2601	version = "0.4.0"
		2602	source = "registry+https://github.com/rust-lang/crates.io-index"
		2603	checksum = "a9fcdd2e881d02f1d9390ae47ad8e5696a9e4be7b547a1da2afbc61973217004"
		2604	dependencies = [
		2605	"rand_core 0.5.1",
2161	]	2606	]
2162		2607
2163	[[package]]	2608	[[package]]
@@ -2243,6 +2688,12 @@ dependencies = [ · 79 unmodified lines
2243	"winapi",	2688	"winapi",
2244	]	2689	]
2245		2690
		2691	[[package]]
		2692	name = "rustc-hash"
		2693	version = "1.1.0"
		2694	source = "registry+https://github.com/rust-lang/crates.io-index"
		2695	checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
		2696
2246	[[package]]	2697	[[package]]
2247	name = "rustc_version"	2698	name = "rustc_version"
2248	version = "0.4.0"	2699	version = "0.4.0"
@@ -2432,6 +2883,16 @@ version = "1.3.0" · 183 unmodified lines
2432	source = "registry+https://github.com/rust-lang/crates.io-index"	2883	source = "registry+https://github.com/rust-lang/crates.io-index"
2433	checksum = "1ad1d488a557b235fc46dae55512ffbfc429d2482b08b4d9435ab07384ca8aec"	2884	checksum = "1ad1d488a557b235fc46dae55512ffbfc429d2482b08b4d9435ab07384ca8aec"
2434		2885
		2886	[[package]]
		2887	name = "sized-chunks"
		2888	version = "0.6.5"
		2889	source = "registry+https://github.com/rust-lang/crates.io-index"
		2890	checksum = "16d69225bde7a69b235da73377861095455d298f2b970996eec25ddbb42b3d1e"
		2891	dependencies = [
		2892	"bitmaps",
		2893	"typenum",
		2894	]
		2895
2435	[[package]]	2896	[[package]]
2436	name = "slab"	2897	name = "slab"
2437	version = "0.4.5"	2898	version = "0.4.5"
@@ -2638,13 +3099,45 @@ dependencies = [ · 200 unmodified lines
2638	"linked-hash-map",	3099	"linked-hash-map",
2639	]	3100	]
2640		3101
		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	[[package]]	3134	[[package]]
2642	name = "traversal"	3135	name = "traversal"
2643	version = "0.1.0"	3136	version = "0.1.0"
2644	dependencies = [	3137	dependencies = [
2645	"anyhow",	3138	"anyhow",
2646	"dashmap",	3139	"dashmap",
2647	"git-repository",	3140	"git-repository 0.13.0",
2648	"git2",	3141	"git2",
2649	"rayon",	3142	"rayon",
2650	]	3143	]
@@ -2778,6 +3271,16 @@ version = "0.9.3" · 127 unmodified lines
2778	source = "registry+https://github.com/rust-lang/crates.io-index"	3271	source = "registry+https://github.com/rust-lang/crates.io-index"
2779	checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"	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	[[package]]	3284	[[package]]
2782	name = "waker-fn"	3285	name = "waker-fn"
2783	version = "1.1.0"	3286	version = "1.1.0"

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

 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[features]
+radicle-nightly = ["link-git"]
 [dependencies]
 anyhow = "1"
-git-repository = { version ="^0.13.0", path = "../../git-repository", features = ["unstable"] }
+git-repository = { version ="^0.13.0", features = ["unstable"] }
 git2 = "0.13"
+link-git = { git = "https://github.com/Byron/radicle-link.git", rev = "6c9ad7aeadcf2b04f87cc01c9825c472c3ba0911", optional = true }
 rayon = "1.5.0"
 parking_lot = { version = "0.11.0", default-features = false }

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

@@ -1,7 +1,7 @@
1	use std::{path::Path, sync::Arc, time::Instant};	1	use std::{path::Path, sync::Arc, time::Instant};
2		2
3	use anyhow::anyhow;	3	use anyhow::anyhow;
4	use git_repository::{hash::ObjectId, odb, prelude::*, Repository};	4	use git_repository::{hash::ObjectId, odb, Repository};
5		5
6	const GITOXIDE_STATIC_CACHE_SIZE: usize = 64;	6	const GITOXIDE_STATIC_CACHE_SIZE: usize = 64;
7	const GITOXIDE_CACHED_OBJECT_DATA_PER_THREAD_IN_BYTES: usize = 60_000_000;	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	objs_per_sec(elapsed)	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	let start = Instant::now();	48	let start = Instant::now();
36	let bytes = do_gitoxide_in_parallel_through_arc(	49	let bytes = do_gitoxide_in_parallel_through_arc(
37	&hashes,	50	&hashes,
@@ -47,6 +60,19 @@ fn main() -> anyhow::Result<()> { · 9 unmodified lines
47	objs_per_sec(elapsed)	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	let start = Instant::now();	76	let start = Instant::now();
51	do_gitoxide_in_parallel_through_arc(	77	do_gitoxide_in_parallel_through_arc(
52	&hashes,	78	&hashes,
@@ -230,6 +256,7 @@ fn do_gitoxide<C>(hashes: &[ObjectId], repo: &Repository, new_cache: impl FnOnce · 177 unmodified lines
230	where	256	where
231	C: odb::pack::cache::DecodeEntry,	257	C: odb::pack::cache::DecodeEntry,
232	{	258	{
		259	use git_repository::prelude::FindExt;
233	let mut buf = Vec::new();	260	let mut buf = Vec::new();
234	let mut bytes = 0u64;	261	let mut bytes = 0u64;
235	let mut cache = new_cache();	262	let mut cache = new_cache();
@@ -254,6 +281,7 @@ fn do_gitoxide_in_parallel<C>( · 18 unmodified lines
254	where	281	where
255	C: odb::pack::cache::DecodeEntry,	282	C: odb::pack::cache::DecodeEntry,
256	{	283	{
		284	use git_repository::prelude::FindExt;
257	use rayon::prelude::*;	285	use rayon::prelude::*;
258	let bytes = std::sync::atomic::AtomicU64::default();	286	let bytes = std::sync::atomic::AtomicU64::default();
259	hashes.par_iter().try_for_each_init::<_, _, _, anyhow::Result<_>>(	287	hashes.par_iter().try_for_each_init::<_, _, _, anyhow::Result<_>>(
@@ -275,6 +303,46 @@ where · 15 unmodified lines
275	Ok(bytes.load(std::sync::atomic::Ordering::Acquire))	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	fn do_gitoxide_in_parallel_through_arc<C>(	346	fn do_gitoxide_in_parallel_through_arc<C>(
279	hashes: &[ObjectId],	347	hashes: &[ObjectId],
280	repo: &Path,	348	repo: &Path,
@@ -284,6 +352,7 @@ fn do_gitoxide_in_parallel_through_arc<C>( · 3 unmodified lines
284	where	352	where
285	C: odb::pack::cache::DecodeEntry,	353	C: odb::pack::cache::DecodeEntry,
286	{	354	{
		355	use git_repository::prelude::FindExt;
287	let bytes = std::sync::atomic::AtomicU64::default();	356	let bytes = std::sync::atomic::AtomicU64::default();
288	let odb = Arc::new(git_repository::odb::linked::Store::at(repo)?);	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	where	388	where
320	C: odb::pack::cache::DecodeEntry,	389	C: odb::pack::cache::DecodeEntry,
321	{	390	{
		391	use git_repository::prelude::FindExt;
322	let bytes = std::sync::atomic::AtomicU64::default();	392	let bytes = std::sync::atomic::AtomicU64::default();
323	let odb = Arc::new(parking_lot::RwLock::new(git_repository::odb::linked::Store::at(repo)?));	393	let odb = Arc::new(parking_lot::RwLock::new(git_repository::odb::linked::Store::at(repo)?));
324		394