feat(avm): 1-slot sload/sstore (nr, ts)

[fcarreiro]

As agreed with Zac,

• Changes the AVM opcodes to work 1-slot at a time (this is easier to handle in the circuit).
• Bubbles up changes to aztec nr. However, this is internal to the PublicContext only, the exported interface still takes N slots/fields.

On the CPP side, I hardcoded sizes to 1. Work needs to be done to simplify things now that we can.

[fcarreiro]

• feat(avm): 1-slot sload/sstore (nr, ts) #8264 👈
• master

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[AztecBot]

Benchmark results

Metrics with a significant change:

• protocol_circuit_simulation_time_in_ms (private-kernel-tail-to-public): 775 (-46%)
• avm_simulation_time_ms (Token:mint_public): 77.2 (+77%)
• avm_simulation_time_ms (Token:assert_minter_and_mint): 41.7 (-36%)
• avm_simulation_time_ms (Token:transfer_public): 34.9 (+50%)
• avm_simulation_time_ms (Token:_increase_public_balance): 67.2 (+61%)
• avm_simulation_bytecode_size_in_bytes (FeeJuice:set_portal): 4,055 (+91%)
• avm_simulation_bytecode_size_in_bytes (FeeJuice:mint_public): 6,522 (+20%)
• avm_simulation_bytecode_size_in_bytes (Token:mint_public): 12,704 (+26%)
• avm_simulation_bytecode_size_in_bytes (Token:assert_minter_and_mint): 8,467 (+24%)
• avm_simulation_bytecode_size_in_bytes (Benchmarking:increment_balance): 7,263 (+18%)

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_ms	5,810 (+1%)	1,566	710	769 (+3%)	777
proof_construction_time_sha256_30_ms	11,631 (+2%)	3,108 (+1%)	1,374	1,419 (-1%)	1,462
proof_construction_time_sha256_100_ms	44,453 (+1%)	11,982 (+1%)	5,443	5,582 (+3%)	5,529 (-2%)
proof_construction_time_poseidon_hash_ms	78.0	34.0	34.0	59.0 (+2%)	87.0 (-1%)
proof_construction_time_poseidon_hash_30_ms	1,541 (+1%)	422	202	221 (-3%)	268 (-1%)
proof_construction_time_poseidon_hash_100_ms	5,681 (+1%)	1,525 (+1%)	676 (+1%)	736 (-2%)	747

L2 block published to L1

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

Metric	4 txs	8 txs	16 txs
l1_rollup_calldata_size_in_bytes	4,356	7,876	14,884
l1_rollup_calldata_gas	50,268	92,946	178,204
l1_rollup_execution_gas	842,928	1,576,502	3,361,816
l2_block_processing_time_in_ms	253 (-3%)	464 (+2%)	829 (+1%)
l2_block_building_time_in_ms	11,418 (-1%)	22,290	44,938 (+1%)
l2_block_rollup_simulation_time_in_ms	11,418 (-1%)	22,289	44,938 (+1%)
l2_block_public_tx_process_time_in_ms	9,692 (-1%)	20,462	43,070 (+1%)

L2 chain processing

Each column represents the number of blocks on the L2 chain where each block has 8 txs.

Metric	3 blocks	5 blocks
node_history_sync_time_in_ms	3,030	4,042 (+2%)
node_database_size_in_bytes	12,636,240	16,748,624
pxe_database_size_in_bytes	16,254	26,813

Circuits stats

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

Circuit	simulation_time_in_ms	witness_generation_time_in_ms	input_size_in_bytes	output_size_in_bytes	proving_time_in_ms
private-kernel-init	93.5 (-4%)	381 (-1%)	21,735	44,860	N/A
private-kernel-inner	181 (+3%)	680 (-1%)	72,544	45,007	N/A
private-kernel-reset-tiny	314 (+2%)	693 (-2%)	65,593	44,846	N/A
private-kernel-tail	167 (+1%)	131 (-2%)	50,644	52,257	N/A
base-parity	5.89 (+5%)	N/A	160	96.0	N/A
root-parity	35.7	N/A	73,948	96.0	N/A
base-rollup	3,465	N/A	189,136	664	N/A
block-root-rollup	41.5 (+1%)	N/A	58,205	2,448	N/A
public-kernel-setup	84.8	N/A	105,085	71,222	N/A
public-kernel-app-logic	97.6 (+1%)	N/A	104,911	71,222	N/A
public-kernel-tail	857	N/A	390,582	16,414	N/A
private-kernel-reset-small	310 (+1%)	N/A	66,341	45,629	N/A
private-kernel-tail-to-public	⚠️ 775 (-46%)	591	455,400	1,825	N/A
public-kernel-teardown	83.9	N/A	105,349	71,222	N/A
merge-rollup	20.5	N/A	38,174	664	N/A
undefined	N/A	N/A	N/A	N/A	84,012 (+1%)

Stats on running time collected for app circuits

Function	input_size_in_bytes	output_size_in_bytes	witness_generation_time_in_ms
ContractClassRegisterer:register	1,344	11,731	344 (-1%)
ContractInstanceDeployer:deploy	1,408	11,731	18.2
MultiCallEntrypoint:entrypoint	1,920	11,731	407
FeeJuice:deploy	1,376	11,731	391 (+1%)
SchnorrAccount:constructor	1,312	11,731	73.4
SchnorrAccount:entrypoint	2,304	11,731	395 (-1%)
Token:privately_mint_private_note	1,280	11,731	101 (+1%)
FPC:fee_entrypoint_public	1,344	11,731	24.6 (-3%)
Token:transfer	1,312	11,731	224 (+1%)
Benchmarking:create_note	1,344	11,731	86.9
SchnorrAccount:verify_private_authwit	1,280	11,731	31.7 (+14%)
Token:unshield	1,376	11,731	528
FPC:fee_entrypoint_private	1,376	11,731	719

AVM Simulation

Time to simulate various public functions in the AVM.

Function	time_ms	bytecode_size_in_bytes
FeeJuice:_increase_public_balance	60.3 (+7%)	8,174 (+15%)
FeeJuice:set_portal	13.4 (+12%)	⚠️ 4,055 (+91%)
Token:constructor	99.7 (+21%)	29,082 (+15%)
FPC:constructor	56.5 (+4%)	18,940 (+6%)
FeeJuice:mint_public	40.4 (+5%)	⚠️ 6,522 (+20%)
Token:mint_public	⚠️ 77.2 (+77%)	⚠️ 12,704 (+26%)
Token:assert_minter_and_mint	⚠️ 41.7 (-36%)	⚠️ 8,467 (+24%)
AuthRegistry:set_authorized	47.4 (+2%)	4,194 (+6%)
FPC:prepare_fee	244 (-10%)	6,747
Token:transfer_public	⚠️ 34.9 (+50%)	39,863 (+5%)
FPC:pay_refund	53.2 (-6%)	9,398
Benchmarking:increment_balance	1,204 (+1%)	⚠️ 7,263 (+18%)
Token:_increase_public_balance	⚠️ 67.2 (+61%)	8,686 (+13%)
FPC:pay_refund_with_shielded_rebate	64.8 (+5%)	9,881

Public DB Access

Time to access various public DBs.

Function	time_ms
get-nullifier-index	0.166 (+1%)

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	256 leaves	512 leaves	1024 leaves
batch_insert_into_append_only_tree_16_depth_ms	2.21	3.89	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_count	16.8	31.7	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_ms	0.114	0.110	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_32_depth_ms	N/A	N/A	11.4 (+1%)	18.2 (+1%)	31.4 (-1%)	60.5 (+1%)	116 (+2%)
batch_insert_into_append_only_tree_32_depth_hash_count	N/A	N/A	95.9	159	287	543	1,055
batch_insert_into_append_only_tree_32_depth_hash_ms	N/A	N/A	0.109 (+1%)	0.105 (+1%)	0.102	0.104 (+1%)	0.104 (+2%)
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	14.3	26.2 (+1%)	44.5 (-2%)	85.8 (+3%)	165 (+1%)
batch_insert_into_indexed_tree_20_depth_hash_count	N/A	N/A	109	207	355	691	1,363
batch_insert_into_indexed_tree_20_depth_hash_ms	N/A	N/A	0.108 (-1%)	0.106 (+1%)	0.108 (-2%)	0.106 (+4%)	0.104
batch_insert_into_indexed_tree_40_depth_ms	N/A	N/A	16.8	N/A	N/A	N/A	N/A
batch_insert_into_indexed_tree_40_depth_hash_count	N/A	N/A	132	N/A	N/A	N/A	N/A
batch_insert_into_indexed_tree_40_depth_hash_ms	N/A	N/A	0.107	N/A	N/A	N/A	N/A

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	64,779	668,997

Transaction size based on fee payment method

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