feat(avm): poseidon2 gadget

[IlyasRidhuan]

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[IlyasRidhuan]

• feat(avm): add temporary sha256 execution #6604
• feat(avm): avm keccak permutation #6596
• feat(avm): poseidon2 gadget #6504 👈
• feat(avm): sha256_compression #6452
• master

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[AztecBot]

Benchmark results

Metrics with a significant change:

• protocol_circuit_witness_generation_time_in_ms (root-parity): 58.6 (-41%)

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	5,709	1,544	692 (-2%)	759 (+4%)	772
proof_construction_time_sha256_30_ms	11,732 (+3%)	3,143 (+2%)	1,411 (+3%)	1,439 (+2%)	1,465 (+2%)
proof_construction_time_sha256_100_ms	43,906	11,737	5,447 (+1%)	5,817 (-4%)	5,366
proof_construction_time_poseidon_hash_ms	236	79.0	58.0	93.0 (+4%)	149 (+1%)
proof_construction_time_poseidon_hash_30_ms	5,750	1,576 (+1%)	730 (+2%)	785 (+3%)	797 (+1%)
proof_construction_time_poseidon_hash_100_ms	11,394	3,062	1,375 (+1%)	1,422 (+1%)	1,441

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	1,412	1,412	1,412
l1_rollup_calldata_gas	9,440	9,476	9,452
l1_rollup_execution_gas	616,081	616,117	616,093
l2_block_processing_time_in_ms	1,303 (+2%)	4,840 (+1%)	9,631 (+1%)
l2_block_building_time_in_ms	45,620	180,383	360,881 (-1%)
l2_block_rollup_simulation_time_in_ms	45,442	179,732	359,597 (-1%)
l2_block_public_tx_process_time_in_ms	24,556	102,276	209,537

L2 chain processing

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

Metric	3 blocks	5 blocks
node_history_sync_time_in_ms	9,519 (+1%)	14,449
node_database_size_in_bytes	14,495,824	21,340,240
pxe_database_size_in_bytes	18,071	29,868

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	proving_time_in_ms	input_size_in_bytes	output_size_in_bytes	proof_size_in_bytes	num_public_inputs	size_in_gates
private-kernel-init	135 (-1%)	487	14,035 (-2%)	20,630	64,614	89,536	2,731	524,288
private-kernel-inner	404	950 (+4%)	47,302 (+1%)	92,318	64,614	89,536	2,731	2,097,152
private-kernel-tail	579 (-1%)	2,721 (+4%)	45,587 (+1%)	96,541	77,732	11,648	297	2,097,152
base-parity	6.54 (+2%)	1,250 (+10%)	2,749 (-1%)	128	64.0	2,208	2.00	131,072
root-parity	49.2 (+1%)	⚠️ 58.6 (-41%)	51,956 (+2%)	27,084	64.0	2,720	18.0	2,097,152
base-rollup	730	2,420	88,145 (+4%)	119,734	756	3,648	47.0	4,194,304
root-rollup	109	75.1 (-5%)	23,541 (+3%)	25,297	620	3,456	41.0	1,048,576
public-kernel-app-logic	531 (-1%)	3,216 (+4%)	51,842 (+1%)	105,253	86,550	116,768	3,582	2,097,152
public-kernel-tail	1,111 (-1%)	25,413 (+7%)	180,387 (+2%)	401,002	7,646	11,648	297	8,388,608
private-kernel-reset-small	584 (-1%)	2,092	49,899 (+1%)	120,733	64,614	89,536	2,731	2,097,152
merge-rollup	28.7	N/A	N/A	16,534	756	N/A	N/A	N/A
public-kernel-setup	636 (-1%)	N/A	N/A	105,253	86,550	N/A	N/A	N/A
public-kernel-teardown	553 (+1%)	N/A	N/A	105,253	86,550	N/A	N/A	N/A
private-kernel-tail-to-public	N/A	8,280 (-2%)	106,925 (+1%)	N/A	N/A	116,768	3,582	4,194,304

Stats on running time collected for app circuits

Function	input_size_in_bytes	output_size_in_bytes	witness_generation_time_in_ms	proof_size_in_bytes	proving_time_in_ms	size_in_gates	num_public_inputs
ContractClassRegisterer:register	1,344	9,944	470 (+2%)	N/A	N/A	N/A	N/A
ContractInstanceDeployer:deploy	1,408	9,944	41.1 (-1%)	N/A	N/A	N/A	N/A
MultiCallEntrypoint:entrypoint	1,920	9,944	1,682 (+1%)	N/A	N/A	N/A	N/A
SchnorrAccount:constructor	1,312	9,944	1,428	N/A	N/A	N/A	N/A
SchnorrAccount:entrypoint	2,304	9,944	2,595	16,768	53,795 (+1%)	2,097,152	457
Token:privately_mint_private_note	1,280	9,944	1,556 (+1%)	N/A	N/A	N/A	N/A
Token:transfer	1,376	9,944	4,922 (+1%)	16,768	57,796 (+1%)	2,097,152	457
Benchmarking:create_note	1,344	9,944	1,394 (-1%)	N/A	N/A	N/A	N/A
FPC:fee_entrypoint_public	1,344	9,944	226	N/A	N/A	N/A	N/A
SchnorrAccount:spend_private_authwit	1,280	9,944	77.0	N/A	N/A	N/A	N/A
Token:unshield	1,376	9,944	3,721	N/A	N/A	N/A	N/A
FPC:fee_entrypoint_private	1,376	9,944	4,576	N/A	N/A	N/A	N/A

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	10.4	17.0 (+1%)	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	0.605	0.519 (+1%)	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	48.5 (+1%)	76.8 (+1%)	249 (+1%)	475	931	1,861 (+1%)	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	0.496	0.473 (+1%)	0.451	0.443	0.441	0.443 (+1%)	N/A
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	58.2 (+1%)	113	360 (+2%)	699	1,392	2,788 (+1%)	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	0.504	0.506	0.487 (+2%)	0.480	0.481	0.483 (+1%)	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	62.7
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	107
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	0.555

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	84,050	665,267

Transaction size based on fee payment method

| Metric | |
| - | |

[github-actions]

Changes to circuit sizes

Generated at commit: 97a91782d39ce5d50eaef78f284432a8bfef8547, compared to commit: 56a59d196ab887d66784204aa4ac85aceaef6205

🧾 Summary (100% most significant diffs)

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
private_kernel_reset_big	+15,596 ❌	+9.00%	+131,418 ❌	+8.49%
private_kernel_reset_medium	+6,684 ❌	+4.51%	+56,322 ❌	+4.70%
private_kernel_reset_small	+3,342 ❌	+2.49%	+28,187 ❌	+2.78%
rollup_base	+9,914 ❌	+5.47%	+29,611 ❌	+1.67%
private_kernel_tail	-2 ✅	-0.00%	-4 ✅	-0.00%
private_kernel_tail_to_public	-4 ✅	-0.00%	-8 ✅	-0.00%
public_kernel_teardown	-160 ✅	-0.07%	-300 ✅	-0.04%
public_kernel_setup	-160 ✅	-0.07%	-300 ✅	-0.04%
public_kernel_app_logic	-200 ✅	-0.08%	-360 ✅	-0.05%
private_kernel_tail_to_public_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_app_logic_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_setup_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_teardown_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_tail	-2,126 ✅	-0.21%	-4,928 ✅	-0.13%
private_kernel_tail_simulated	0 ➖	0.00%	-2 ✅	-0.75%
public_kernel_tail_simulated	0 ➖	0.00%	-2 ✅	-0.75%

---

Full diff report 👇

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
private_kernel_reset_big	188,976 (+15,596)	+9.00%	1,678,516 (+131,418)	+8.49%
private_kernel_reset_medium	154,744 (+6,684)	+4.51%	1,253,708 (+56,322)	+4.70%
private_kernel_reset_small	137,627 (+3,342)	+2.49%	1,041,303 (+28,187)	+2.78%
rollup_base	191,041 (+9,914)	+5.47%	1,806,511 (+29,611)	+1.67%
private_kernel_tail	195,031 (-2)	-0.00%	1,316,885 (-4)	-0.00%
private_kernel_tail_to_public	621,552 (-4)	-0.00%	2,147,286 (-8)	-0.00%
public_kernel_teardown	223,363 (-160)	-0.07%	667,581 (-300)	-0.04%
public_kernel_setup	223,157 (-160)	-0.07%	667,288 (-300)	-0.04%
public_kernel_app_logic	251,697 (-200)	-0.08%	796,596 (-360)	-0.05%
private_kernel_tail_to_public_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_app_logic_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_setup_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_teardown_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_tail	1,027,305 (-2,126)	-0.21%	3,704,913 (-4,928)	-0.13%
private_kernel_tail_simulated	1 (0)	0.00%	265 (-2)	-0.75%
public_kernel_tail_simulated	1 (0)	0.00%	265 (-2)	-0.75%

[jeanmon]

LGTM. See comments