chore: simplify compilation flow to just write to file immediately

[TomAFrench]

Now that we prefer to read artifacts from disk (#6279), there's no need to hold all of the compiled programs in memory. We can instead just write them to file immediately.

This PR does this so we can split up the logic related to compiling programs and contracts a bit more.

[AztecBot]

Benchmark results

Metrics with a significant change:

• app_circuit_proving_time_in_ms (Test:emit_nullifier): 1,776 (-35%)
• app_circuit_proving_time_in_ms (FPC:fee_entrypoint_public): 9,334 (-43%)
• protocol_circuit_witness_generation_time_in_ms (base-parity): 1,142 (-31%)
• protocol_circuit_witness_generation_time_in_ms (public-kernel-setup): 985 (+16%)
• protocol_circuit_witness_generation_time_in_ms (base-rollup): 2,323 (-20%)
• protocol_circuit_witness_generation_time_in_ms (public-kernel-app-logic): 289 (+41%)
• protocol_circuit_witness_generation_time_in_ms (public-kernel-teardown): 280 (+22%)
• protocol_circuit_witness_generation_time_in_ms (merge-rollup): 127 (-31%)
• protocol_circuit_proving_time_in_ms (public-kernel-setup): 1,208 (+37%)
• protocol_circuit_proving_time_in_ms (public-kernel-app-logic): 1,055 (+23%)
• protocol_circuit_proving_time_in_ms (merge-rollup): 2,360 (+47%)

Detailed results

All benchmarks are run on txs on the Benchmarking contract on the repository. Each tx consists of a batch call to create_note and increment_balance, which guarantees that each tx has a private call, a nested private call, a public call, and a nested public call, as well as an emitted private note, an unencrypted log, and public storage read and write.

This benchmark source data is available in JSON format on S3 here.

Proof generation

Each column represents the number of threads used in proof generation.

Metric	1 threads	4 threads	16 threads	32 threads	64 threads
proof_construction_time_sha256	5,755 (+1%)	1,570 (+1%)	715	775 (+2%)	775

L2 block published to L1

Each column represents the number of txs on an L2 block published to L1.

Metric	8 txs	32 txs	64 txs
l1_rollup_calldata_size_in_bytes	772	772	772
l1_rollup_calldata_gas	6,856	6,856	6,832
l1_rollup_execution_gas	587,396	587,396	587,372
l2_block_processing_time_in_ms	1,363	5,066 (-1%)	10,110
l2_block_building_time_in_ms	33,425	131,712 (-1%)	262,605 (-1%)
l2_block_rollup_simulation_time_in_ms	33,244	131,072 (-1%)	261,349 (-1%)
l2_block_public_tx_process_time_in_ms	20,466 (-1%)	82,612 (-1%)	165,162 (-1%)

L2 chain processing

Each column represents the number of blocks on the L2 chain where each block has 16 txs.

Metric	5 blocks	10 blocks
node_history_sync_time_in_ms	15,189 (-1%)	28,478
node_database_size_in_bytes	21,418,064	38,129,744
pxe_database_size_in_bytes	29,868	59,425

Circuits stats

Stats on running time and I/O sizes collected for every kernel circuit run across all benchmarks.

Circuit	protocol_circuit_simulation_time_in_ms	protocol_circuit_witness_generation_time_in_ms	protocol_circuit_proving_time_in_ms	protocol_circuit_input_size_in_bytes	protocol_circuit_output_size_in_bytes	protocol_circuit_proof_size_in_bytes	protocol_circuit_num_public_inputs	protocol_circuit_size_in_gates
private-kernel-init	160	3,641	22,764 (+5%)	19,987	61,999	86,720	2,643	1,048,576
private-kernel-inner	611 (-1%)	5,100 (+7%)	40,371 (-1%)	89,054	61,999	86,720	2,643	2,097,152
private-kernel-reset-small	579	2,353 (-1%)	23,122	117,961	61,999	86,720	2,643	1,048,576
private-kernel-tail	534	3,819 (-5%)	37,726	86,849	79,454	10,688	267	2,097,152
base-parity	7.62	⚠️ 1,142 (-31%)	3,367 (+11%)	128	64.0	2,208	2.00	131,072
root-parity	49.8 (-2%)	155 (+15%)	39,885 (-6%)	27,064	64.0	2,720	18.0	2,097,152
base-rollup	776 (-2%)	⚠️ 2,323 (-20%)	43,213 (-1%)	111,158	957	3,136	31.0	2,097,152
root-rollup	94.0	114 (-5%)	8,275	11,518	821	3,456	41.0	524,288
public-kernel-app-logic	245	⚠️ 289 (+41%)	⚠️ 1,055 (+23%)	96,979	85,095	116,448	3,572	4,096
public-kernel-tail	874	680 (+1%)	899 (-12%)	388,207	7,755	10,176	251	512
public-kernel-setup	230	⚠️ 985 (+16%)	⚠️ 1,208 (+37%)	138,310	85,095	116,448	3,572	4,096
public-kernel-teardown	237 (+8%)	⚠️ 280 (+22%)	1,011 (+13%)	143,321	85,095	116,448	3,572	4,096
merge-rollup	6.57	⚠️ 127 (-31%)	⚠️ 2,360 (+47%)	2,760	957	3,136	31.0	65,536
private-kernel-tail-to-public	N/A	9,562 (-2%)	72,925 (+1%)	N/A	N/A	116,960	3,588	4,194,304

Stats on running time collected for app circuits

Function	app_circuit_proof_size_in_bytes	app_circuit_proving_time_in_ms	app_circuit_size_in_gates	app_circuit_num_public_inputs
SchnorrAccount:entrypoint	16,128	47,453 (-1%)	2,097,152	437
Test:emit_nullifier	16,128	⚠️ 1,776 (-35%)	65,536	437
FPC:fee_entrypoint_public	16,128	⚠️ 9,334 (-43%)	524,288	437
FPC:fee_entrypoint_private	16,128	8,890 (-1%)	524,288	437
Token:unshield	16,128	50,255 (+5%)	2,097,152	437
SchnorrAccount:spend_private_authwit	16,128	2,709 (+1%)	131,072	437
Token:transfer	16,128	34,937	2,097,152	437

Tree insertion stats

The duration to insert a fixed batch of leaves into each tree type.

Metric	1 leaves	16 leaves	64 leaves	128 leaves	512 leaves	1024 leaves	2048 leaves	4096 leaves	32 leaves
batch_insert_into_append_only_tree_16_depth_ms	11.3	18.4	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_count	16.7	31.8	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_ms	0.659	0.565	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_32_depth_ms	N/A	N/A	52.4	81.0	262	505 (-1%)	986	1,958	N/A
batch_insert_into_append_only_tree_32_depth_hash_count	N/A	N/A	95.9	159	543	1,055	2,079	4,127	N/A
batch_insert_into_append_only_tree_32_depth_hash_ms	N/A	N/A	0.536	0.500	0.476	0.471 (-1%)	0.468	0.467	N/A
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	62.5 (-2%)	119 (-1%)	377	742 (-1%)	1,469	2,936	N/A
batch_insert_into_indexed_tree_20_depth_hash_count	N/A	N/A	106	208	692	1,363	2,707	5,395	N/A
batch_insert_into_indexed_tree_20_depth_hash_ms	N/A	N/A	0.543 (-1%)	0.536	0.512	0.510 (-1%)	0.509	0.510	N/A
batch_insert_into_indexed_tree_40_depth_ms	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	67.7 (-1%)
batch_insert_into_indexed_tree_40_depth_hash_count	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	108
batch_insert_into_indexed_tree_40_depth_hash_ms	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	0.593 (-1%)

Miscellaneous

Transaction sizes based on how many contract classes are registered in the tx.

Metric	0 registered classes	1 registered classes
tx_size_in_bytes	84,743	673,221

Transaction size based on fee payment method

| Metric | |
| - | |

Transaction processing duration by data writes.

Metric	0 new note hashes	1 new note hashes	2 new note hashes
tx_pxe_processing_time_ms	29,722	4,276	100,284 (+1%)

Metric	0 public data writes	1 public data writes	2 public data writes	4 public data writes	8 public data writes
tx_sequencer_processing_time_ms	1,472 (-10%)	2,691	2,079 (+2%)	3,382 (+3%)	1,995