Benchmarks for Arrow IPC reader

arrow-ipc/Cargo.toml

@@ -50,7 +50,14 @@ lz4 = ["lz4_flex"]
 criterion = "0.5.1"
 tempfile = "3.3"
 tokio = "1.43.0"
+# used in benches
+memmap2 = "0.9.3"
+bytes = "1.9"
 
 [[bench]]
 name = "ipc_writer"
 harness = false
+
+[[bench]]
+name = "ipc_reader"
+harness = false

arrow-ipc/benches/ipc_reader.rs

@@ -0,0 +1,229 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+use arrow_array::builder::{Date32Builder, Decimal128Builder, Int32Builder};
+use arrow_array::{builder::StringBuilder, RecordBatch};
+use arrow_buffer::Buffer;
+use arrow_ipc::convert::fb_to_schema;
+use arrow_ipc::reader::{read_footer_length, FileDecoder, FileReader, StreamReader};
+use arrow_ipc::writer::{FileWriter, IpcWriteOptions, StreamWriter};
+use arrow_ipc::{root_as_footer, Block, CompressionType};
+use arrow_schema::{DataType, Field, Schema};
+use criterion::{criterion_group, criterion_main, Criterion};
+use std::io::Cursor;
+use std::sync::Arc;
+use tempfile::tempdir;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let mut group = c.benchmark_group("arrow_ipc_reader");
+
+    group.bench_function("StreamReader/read_10", |b| {
+        let batch = create_batch(8192, true);
+        let mut buffer = Vec::with_capacity(2 * 1024 * 1024);
+        let mut writer = StreamWriter::try_new(&mut buffer, batch.schema().as_ref()).unwrap();
+        for _ in 0..10 {
+            writer.write(&batch).unwrap();
+        }
+        writer.finish().unwrap();
+
+        b.iter(move || {
+            let projection = None;
+            let mut reader = StreamReader::try_new(buffer.as_slice(), projection).unwrap();
+            for _ in 0..10 {
+                reader.next().unwrap().unwrap();
+            }
+            assert!(reader.next().is_none());
+        })
+    });
+
+    group.bench_function("StreamReader/read_10/zstd", |b| {
+        let batch = create_batch(8192, true);
+        let mut buffer = Vec::with_capacity(2 * 1024 * 1024);
+        let options = IpcWriteOptions::default()
+            .try_with_compression(Some(CompressionType::ZSTD))
+            .unwrap();
+        let mut writer =
+            StreamWriter::try_new_with_options(&mut buffer, batch.schema().as_ref(), options)
+                .unwrap();
+        for _ in 0..10 {
+            writer.write(&batch).unwrap();
+        }
+        writer.finish().unwrap();
+
+        b.iter(move || {
+            let projection = None;
+            let mut reader = StreamReader::try_new(buffer.as_slice(), projection).unwrap();
+            for _ in 0..10 {
+                reader.next().unwrap().unwrap();
+            }
+            assert!(reader.next().is_none());
+        })
+    });
+
+    group.bench_function("FileReader/read_10", |b| {
+        let batch = create_batch(8192, true);
+        let mut buffer = Vec::with_capacity(2 * 1024 * 1024);
+        let mut writer = FileWriter::try_new(&mut buffer, batch.schema().as_ref()).unwrap();
+        for _ in 0..10 {
+            writer.write(&batch).unwrap();
+        }
+        writer.finish().unwrap();
+
+        b.iter(move || {
+            let projection = None;
+            let cursor = Cursor::new(buffer.as_slice());
+            let mut reader = FileReader::try_new(cursor, projection).unwrap();
+            for _ in 0..10 {
+                reader.next().unwrap().unwrap();
+            }
+            assert!(reader.next().is_none());
+        })
+    });
+
+    group.bench_function("FileReader/read_10/mmap", |b| {
+        let batch = create_batch(8192, true);
+        // write to an actual file
+        let dir = tempdir().unwrap();
+        let path = dir.path().join("test.arrow");
+        let file = std::fs::File::create(&path).unwrap();
+        let mut writer = FileWriter::try_new(file, batch.schema().as_ref()).unwrap();
+        for _ in 0..10 {
+            writer.write(&batch).unwrap();
+        }
+        writer.finish().unwrap();
+
+        b.iter(move || {
+            let ipc_file = std::fs::File::open(&path).expect("failed to open file");
+            let mmap = unsafe { memmap2::Mmap::map(&ipc_file).expect("failed to mmap file") };
+
+            // Convert the mmap region to an Arrow `Buffer` to back the arrow arrays.
+            let bytes = bytes::Bytes::from_owner(mmap);
+            let buffer = Buffer::from(bytes);
+            let decoder = IPCBufferDecoder::new(buffer);
+            assert_eq!(decoder.num_batches(), 10);
+
+            for i in 0..decoder.num_batches() {
+                decoder.get_batch(i);
+            }
+        })
+    });
+}
+
+// copied from the zero_copy_ipc example.
+// should we move this to an actual API?
+/// Wrapper around the example in the `FileDecoder` which handles the
+/// low level interaction with the Arrow IPC format.
+struct IPCBufferDecoder {
+    /// Memory (or memory mapped) Buffer with the data
+    buffer: Buffer,
+    /// Decoder that reads Arrays that refers to the underlying buffers
+    decoder: FileDecoder,
+    /// Location of the batches within the buffer
+    batches: Vec<Block>,
+}
+
+impl IPCBufferDecoder {
+    fn new(buffer: Buffer) -> Self {
+        let trailer_start = buffer.len() - 10;
+        let footer_len = read_footer_length(buffer[trailer_start..].try_into().unwrap()).unwrap();
+        let footer = root_as_footer(&buffer[trailer_start - footer_len..trailer_start]).unwrap();
+
+        let schema = fb_to_schema(footer.schema().unwrap());
+
+        let mut decoder = FileDecoder::new(Arc::new(schema), footer.version());
+
+        // Read dictionaries
+        for block in footer.dictionaries().iter().flatten() {
+            let block_len = block.bodyLength() as usize + block.metaDataLength() as usize;
+            let data = buffer.slice_with_length(block.offset() as _, block_len);
+            decoder.read_dictionary(block, &data).unwrap();
+        }
+
+        // convert to Vec from the flatbuffers Vector to avoid having a direct dependency on flatbuffers
+        let batches = footer
+            .recordBatches()
+            .map(|b| b.iter().copied().collect())
+            .unwrap_or_default();
+
+        Self {
+            buffer,
+            decoder,
+            batches,
+        }
+    }
+
+    fn num_batches(&self) -> usize {
+        self.batches.len()
+    }
+
+    fn get_batch(&self, i: usize) -> RecordBatch {
+        let block = &self.batches[i];
+        let block_len = block.bodyLength() as usize + block.metaDataLength() as usize;
+        let data = self
+            .buffer
+            .slice_with_length(block.offset() as _, block_len);
+        self.decoder
+            .read_record_batch(block, &data)
+            .unwrap()
+            .unwrap()
+    }
+}
+
+fn create_batch(num_rows: usize, allow_nulls: bool) -> RecordBatch {
+    let schema = Arc::new(Schema::new(vec![
+        Field::new("c0", DataType::Int32, true),
+        Field::new("c1", DataType::Utf8, true),
+        Field::new("c2", DataType::Date32, true),
+        Field::new("c3", DataType::Decimal128(11, 2), true),
+    ]));
+    let mut a = Int32Builder::new();
+    let mut b = StringBuilder::new();
+    let mut c = Date32Builder::new();
+    let mut d = Decimal128Builder::new()
+        .with_precision_and_scale(11, 2)
+        .unwrap();
+    for i in 0..num_rows {
+        a.append_value(i as i32);
+        c.append_value(i as i32);
+        d.append_value((i * 1000000) as i128);
+        if allow_nulls && i % 10 == 0 {
+            b.append_null();
+        } else {
+            b.append_value(format!("this is string number {i}"));
+        }
+    }
+    let a = a.finish();
+    let b = b.finish();
+    let c = c.finish();
+    let d = d.finish();
+    RecordBatch::try_new(
+        schema.clone(),
+        vec![Arc::new(a), Arc::new(b), Arc::new(c), Arc::new(d)],
+    )
+    .unwrap()
+}
+
+fn config() -> Criterion {
+    Criterion::default()
+}
+
+criterion_group! {
+    name = benches;
+    config = config();
+    targets = criterion_benchmark
+}
+criterion_main!(benches);