Add profiling tools, examples

eth2/utils/ssz/examples/large_list.rs

@@ -0,0 +1,16 @@
+//! Encode and decode a list 10,000 times.
+//!
+//! Useful for `cargo flamegraph`.
+
+use ssz::{Decodable, Encodable};
+
+fn main() {
+    let vec: Vec<u64> = vec![4242; 8196];
+
+    let output: Vec<Vec<u64>> = (0..10_000)
+        .into_iter()
+        .map(|_| Vec::from_ssz_bytes(&vec.as_ssz_bytes()).unwrap())
+        .collect();
+
+    println!("{}", output.len());
+}