code cleaning and building/running script modified with rust flags for faster run

hash/plonky2/bench/build.sh

@@ -4,5 +4,7 @@
 rustup override set nightly
 
 # Build 
-cargo build
+# RUSTFLAGS=-Ctarget-cpu=native cargo build
+RUSTFLAGS=-Ctarget-cpu=native cargo build --release --bin plonky2_hash_benchmarks
+
 

hash/plonky2/bench/run.sh

@@ -12,4 +12,4 @@ echo "HASH            = $ZKBENCH_HASH_TYPE"
 echo "Input Size (Bytes) = $ZKBENCH_INPUT_SIZE_BYTES"
 
 # Run the benchmarks
-./target/debug/plonky2_hash_benchmarks $ZKBENCH_HASH_TYPE $ZKBENCH_INPUT_SIZE_BYTES
+./target/release/plonky2_hash_benchmarks $ZKBENCH_HASH_TYPE $ZKBENCH_INPUT_SIZE_BYTES

hash/plonky2/bench/src/bench/keccak256/keccak.rs

@@ -251,23 +251,28 @@ pub fn keccak_bench(size: usize) -> Result<()>{
     for i in 0..256 {
         pw.set_bool_target(output_t[i], exptected_output_bits[i]);
     }
-
-    println!("circuit size: {:?}", builder.num_gates());
+    let circuit_size = builder.num_gates();
+    
     let data = builder.build::<C>();
-    let now = Instant::now();
-    let proof = data.prove(pw)?;
-
-    println!("time = {:?}", now.elapsed());
-    println!(
-        "degree = {}, degree_bits= {}",
-        data.common.degree(),
-        data.common.degree_bits()
-    );
-
-    data.verify(proof)?;
-    Ok(())
 
+    let (proof_generation_time, proof) = {
+        let now = Instant::now();
+        let proof = data.prove(pw)?;
+        (now.elapsed(), proof)
+    };
+    let proof_size = proof.to_bytes().len();
+    let (verification_time, verification_result) = {
+        let now = Instant::now();
+        let res = data.verify(proof);
+        (now.elapsed(), res)
+    };
+    
+    eprintln!("circuit size: {}", circuit_size);
+    eprintln!("proof generation time: {:?}", proof_generation_time);
+    eprintln!("verification time: {:?}", verification_time);
+    eprintln!("proof size: {:?}", proof_size);
 
+    verification_result
 }
 
 fn generate_data(size: usize) -> Vec<u8> {

hash/plonky2/bench/src/bench/sha256/sha.rs

@@ -227,6 +227,7 @@ pub fn sha256_bench(size: usize) -> Result<()> {
         let end = start.elapsed();
         (end, proof)
     };
+    let proof_size = proof.to_bytes().len();
     
     let (verification_time, res) = {
         let start = std::time::Instant::now();
@@ -237,6 +238,7 @@ pub fn sha256_bench(size: usize) -> Result<()> {
 
     eprintln!("Proof Generation Time: {:?}", proof_time);
     eprintln!("Verification Time: {:?}", verification_time);
+    eprintln!("Proof size: {:?}", proof_size);
     
     res