Add benchmarks for tx serialization and size

src/blockdata/transaction.rs

@@ -1244,3 +1244,60 @@ mod tests {
         }
     }
 }
+
+#[cfg(all(test, feature = "unstable"))]
+mod benches {
+    use super::Transaction;
+    use EmptyWrite;
+    use consensus::{deserialize, Encodable};
+    use hashes::hex::FromHex;
+    use test::{black_box, Bencher};
+
+    const SOME_TX: &'static str = "0100000001a15d57094aa7a21a28cb20b59aab8fc7d1149a3bdbcddba9c622e4f5f6a99ece010000006c493046022100f93bb0e7d8db7bd46e40132d1f8242026e045f03a0efe71bbb8e3f475e970d790221009337cd7f1f929f00cc6ff01f03729b069a7c21b59b1736ddfee5db5946c5da8c0121033b9b137ee87d5a812d6f506efdd37f0affa7ffc310711c06c7f3e097c9447c52ffffffff0100e1f505000000001976a9140389035a9225b3839e2bbf32d826a1e222031fd888ac00000000";
+
+    #[bench]
+    pub fn bench_block_get_size(bh: &mut Bencher) {
+        let raw_tx = Vec::from_hex(SOME_TX).unwrap();
+
+        let mut tx: Transaction = deserialize(&raw_tx).unwrap();
+
+        bh.iter(|| {
+            black_box(black_box(&mut tx).get_size());
+        });
+    }
+
+    #[bench]
+    pub fn bench_block_serialize(bh: &mut Bencher) {
+        let raw_tx = Vec::from_hex(SOME_TX).unwrap();
+        let tx: Transaction = deserialize(&raw_tx).unwrap();
+
+        let mut data = Vec::with_capacity(raw_tx.len());
+
+        bh.iter(|| {
+            let result = tx.consensus_encode(&mut data);
+            black_box(&result);
+            data.clear();
+        });
+    }
+
+    #[bench]
+    pub fn bench_block_serialize_logic(bh: &mut Bencher) {
+        let raw_tx = Vec::from_hex(SOME_TX).unwrap();
+        let tx: Transaction = deserialize(&raw_tx).unwrap();
+
+        bh.iter(|| {
+            let size = tx.consensus_encode(&mut EmptyWrite);
+            black_box(&size);
+        });
+    }
+
+    #[bench]
+    pub fn bench_block_deserialize(bh: &mut Bencher) {
+        let raw_tx = Vec::from_hex(SOME_TX).unwrap();
+
+        bh.iter(|| {
+            let tx: Transaction = deserialize(&raw_tx).unwrap();
+            black_box(&tx);
+        });
+    }
+}