feat(avm): Gas usage for nested calls

[spalladino]

Adds gas metering for CALLs and STATICCALLs in the AVM. Both opcodes have a fixed gas cost, an extra cost for indirect accesses to memory, and consume whatever gas they pass onto the nested call. The unused gas from the nested call gets refunded when the call returns, as specified on the yellow paper.

[AztecBot]

Benchmark results

No metrics with a significant change found.

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.

Values are compared against data from master at commit e0e72008 and shown if the difference exceeds 1%.

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	676	676	676
l1_rollup_calldata_gas	6,424	6,412	6,412
l1_rollup_execution_gas	585,757	585,745	585,745
l2_block_processing_time_in_ms	1,328 (+3%)	4,730 (-3%)	9,324 (+1%)
note_successful_decrypting_time_in_ms	249 (+5%)	512 (-5%)	1,038 (+8%)
note_trial_decrypting_time_in_ms	51.4 (+36%)	23.1 (-53%)	34.1 (-58%)
l2_block_building_time_in_ms	12,003 (+2%)	43,630 (+2%)	85,305 (+1%)
l2_block_rollup_simulation_time_in_ms	7,127 (+1%)	24,649 (+2%)	47,465 (+1%)
l2_block_public_tx_process_time_in_ms	4,836 (+3%)	18,855 (+2%)	37,589 (+2%)

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	14,143 (+2%)	27,365 (+3%)
note_history_successful_decrypting_time_in_ms	1,311 (+1%)	2,392
note_history_trial_decrypting_time_in_ms	65.6 (-29%)	105 (+3%)
node_database_size_in_bytes	18,624,592	35,098,704 (+1%)
pxe_database_size_in_bytes	29,859	59,414

Circuits stats

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

Circuit	circuit_simulation_time_in_ms	circuit_input_size_in_bytes	circuit_output_size_in_bytes
private-kernel-init	180 (-3%)	44,377	26,164
private-kernel-ordering	162 (-2%)	50,830	39,325
base-parity	4,233 (+4%)	128	311
root-parity	1,143 (-1%)	1,244	311
base-rollup	14,511 (+1%)	116,608	861
root-rollup	50.0 (-2%)	4,359	725
private-kernel-inner	218 (-3%)	71,744	26,164
public-kernel-app-logic	120 (-1%)	47,695	40,661
public-kernel-tail	163 (-1%)	53,372	13,269
merge-rollup	9.61 (-2%)	2,568	861
public-kernel-teardown	118 (+2%)	47,695	40,661
public-kernel-setup	118 (+3%)	47,695	40,661

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	10.1 (+1%)	16.2	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_count	16.8	31.6	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_ms	0.585	0.498	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	46.0 (+1%)	72.3	231 (+1%)	446	875 (+2%)	1,737 (+1%)	N/A
batch_insert_into_append_only_tree_32_depth_hash_count	N/A	N/A	96.0	159	543	1,055	2,079	4,127	N/A
batch_insert_into_append_only_tree_32_depth_hash_ms	N/A	N/A	0.472	0.445	0.421 (+1%)	0.417	0.415 (+1%)	0.415 (+1%)	N/A
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	54.4 (+1%)	107	338 (-1%)	662	1,326 (+2%)	2,641 (+2%)	N/A
batch_insert_into_indexed_tree_20_depth_hash_count	N/A	N/A	105	207	691	1,363	2,707	5,395	N/A
batch_insert_into_indexed_tree_20_depth_hash_ms	N/A	N/A	0.480 (+1%)	0.483	0.460 (-1%)	0.455	0.459 (+2%)	0.458 (+2%)	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	61.6 (+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	109
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	0.536 (+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	40,548	501,142

Transaction size based on fee payment method

Metric	native fee payment method	fpc_public fee payment method	fpc_private fee payment method
tx_with_fee_size_in_bytes	905	1,161	1,377

Transaction processing duration by data writes.

Metric	0 new note hashes	1 new note hashes	2 new note hashes
tx_pxe_processing_time_ms	1,717	1,088 (-1%)	5,443 (+1%)

Metric	1 public data writes	2 public data writes	3 public data writes	4 public data writes	5 public data writes	8 public data writes
tx_sequencer_processing_time_ms	580 (+1%)	440 (+1%)	1,082 (+1%)	529 (+1%)	1,772 (+1%)	595 (+2%)

[spalladino]

@fcarreiro ready for re-review!

[spalladino]

• feat(avm): Gas usage for nested calls #5495 : 2 dependent PRs (#5514 , #5563 ) 👈
• master

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