microcosm.blue
Fast and robust atproto CAR file processing in rust
drop empty-mst special-casing
yay we're back to the old api (doctests pass again!!)
authored by
+25
-38
+1
-2
benches/huge-car.rs
+1
-2
benches/huge-car.rs
···
33
33
let reader = tokio::io::BufReader::new(reader);
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let mut driver = match Driver::load_car(reader, ser, 1024).await.unwrap() {
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-
Driver::Memory(_, Some(mem_driver)) => mem_driver,
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-
Driver::Memory(_, None) => panic!("car was empty"),
36
+
Driver::Memory(_, mem_driver) => mem_driver,
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Driver::Disk(_) => panic!("not doing disk for benchmark"),
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};
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39
+1
-2
benches/non-huge-cars.rs
+1
-2
benches/non-huge-cars.rs
···
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async fn drive_car(bytes: &[u8]) -> usize {
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let mut driver = match Driver::load_car(bytes, ser, 32).await.unwrap() {
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-
Driver::Memory(_, Some(mem_driver)) => mem_driver,
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-
Driver::Memory(_, None) => return 0,
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+
Driver::Memory(_, mem_driver) => mem_driver,
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Driver::Disk(_) => panic!("not benching big cars here"),
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};
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46
-4
examples/disk-read-file/main.rs
-4
examples/disk-read-file/main.rs
+4
-6
examples/read-file/main.rs
+4
-6
examples/read-file/main.rs
···
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let reader = tokio::fs::File::open(file).await?;
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let reader = tokio::io::BufReader::new(reader);
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-
let (commit, driver) = match DriverBuilder::new()
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+
let (commit, mut driver) = match DriverBuilder::new()
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.with_block_processor(|block| block.len().to_ne_bytes().to_vec())
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.load_car(reader)
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.await?
···
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log::info!("got commit: {commit:?}");
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let mut n = 0;
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-
if let Some(mut driver) = driver {
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-
while let Some(pairs) = driver.next_chunk(256).await? {
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-
n += pairs.len();
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-
// log::info!("got {rkey:?}");
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-
}
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+
while let Some(pairs) = driver.next_chunk(256).await? {
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+
n += pairs.len();
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+
// log::info!("got {rkey:?}");
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}
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log::info!("bye! total records={n}");
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+7
-7
readme.md
+7
-7
readme.md
···
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74
- 450MiB CAR file (huge): `1.3s`
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75
- 128MiB (huge): `350ms`
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- 5.0MiB: `6.8ms`
77
-
- 279KiB: `170us`
78
-
- 3.4KiB: `5.2us`
79
-
- empty: `670ns`
77
+
- 279KiB: `160us`
78
+
- 3.4KiB: `5.1us`
79
+
- empty: `690ns`
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80
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it's a little faster with `mimalloc`
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82
···
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89
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- 450MiB CAR file: `1.2s` (-8%)
90
90
- 128MiB: `300ms` (-14%)
91
-
- 5.0MiB: `6.0ms` (-12%)
92
-
- 279KiB: `140us` (-21%)
93
-
- 3.4KiB: `4.7us` (-10%)
94
-
- empty: `640ns` (-4%)
91
+
- 5.0MiB: `6.0ms` (-11%)
92
+
- 279KiB: `150us` (-7%)
93
+
- 3.4KiB: `4.7us` (-8%)
94
+
- empty: `670ns` (-4%)
95
95
96
96
processing CARs requires buffering blocks, so it can consume a lot of memory. repo-stream's in-memory driver has minimal memory overhead, but there are two ways to make it work with less mem (you can do either or both!)
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+8
-13
src/drive.rs
+8
-13
src/drive.rs
···
107
107
///
108
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/// You probably want to check the commit's signature. You can go ahead and
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/// walk the MST right away.
110
-
Memory(Commit, Option<MemDriver>),
110
+
Memory(Commit, MemDriver),
111
111
/// Blocks exceed the memory limit
112
112
///
113
113
/// You'll need to provide a disk storage to continue. The commit will be
···
233
233
MaybeProcessedBlock::Processed(_) => Err(WalkError::BadCommitFingerprint)?,
234
234
MaybeProcessedBlock::Raw(bytes) => serde_ipld_dagcbor::from_slice(bytes)?,
235
235
};
236
-
let Some(walker) = Walker::new(root_node) else {
237
-
// TODO: actually we still want the commit in this case
238
-
return Ok(Driver::Memory(commit, None));
239
-
};
236
+
let walker = Walker::new(root_node);
240
237
241
238
Ok(Driver::Memory(
242
239
commit,
243
-
Some(MemDriver {
240
+
MemDriver {
244
241
blocks: mem_blocks,
245
242
walker,
246
243
process,
247
-
}),
244
+
},
248
245
))
249
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}
250
247
}
···
304
301
pub async fn finish_loading(
305
302
mut self,
306
303
mut store: DiskStore,
307
-
) -> Result<(Commit, Option<DiskDriver>), DriveError> {
304
+
) -> Result<(Commit, DiskDriver), DriveError> {
308
305
// move store in and back out so we can manage lifetimes
309
306
// dump mem blocks into the store
310
307
store = tokio::task::spawn(async move {
···
386
383
MaybeProcessedBlock::Processed(_) => Err(WalkError::BadCommitFingerprint)?,
387
384
MaybeProcessedBlock::Raw(bytes) => serde_ipld_dagcbor::from_slice(&bytes)?,
388
385
};
389
-
let Some(walker) = Walker::new(node) else {
390
-
return Ok((commit, None));
391
-
};
386
+
let walker = Walker::new(node);
392
387
393
388
Ok((
394
389
commit,
395
-
Some(DiskDriver {
390
+
DiskDriver {
396
391
process: self.process,
397
392
state: Some(BigState { store, walker }),
398
-
}),
393
+
},
399
394
))
400
395
}
401
396
}
+4
-4
src/walk.rs
+4
-4
src/walk.rs
···
52
52
}
53
53
54
54
impl Walker {
55
-
pub fn new(root_node: MstNode) -> Option<Self> {
56
-
Some(Self {
55
+
pub fn new(root_node: MstNode) -> Self {
56
+
Self {
57
57
prev_rkey: "".to_string(),
58
-
root_depth: root_node.depth?,
58
+
root_depth: root_node.depth.unwrap_or(0), // empty root node = empty mst
59
59
todo: vec![root_node.things],
60
-
})
60
+
}
61
61
}
62
62
63
63
fn mpb_step(