feat: serialize synchronize and simulateTx calls by the pxe via SerialQueue

[just-mitch]

Serialize calls by the PXE to:

• synchronize with the aztec node
• simulate transactions
  by use of a SerialQueue

Synchronization is greedy, meaning it will sync as much as possible while its job is processing.

[just-mitch]

See the get function above. the process loop here only breaks when we get null, which only happens if (this.items.length === 0 && this.flushing)

[just-mitch]

the job queue is only used when synchronizer.start is used. This doesn't happen in this test, nor does it happen in the pxe_service tests.

[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 a876ab8a 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	128 txs
l1_rollup_calldata_size_in_bytes	45,444	179,588	716,132
l1_rollup_calldata_gas	222,936	867,956	3,446,732
l1_rollup_execution_gas	867,045	3,746,009	23,303,497
l2_block_processing_time_in_ms	1,341	5,123 (-1%)	21,400
note_successful_decrypting_time_in_ms	368 (-1%)	1,130 (-4%)	4,304 (+2%)
note_trial_decrypting_time_in_ms	78.2 (-5%)	37.6 (-5%)	140 (-1%)
l2_block_building_time_in_ms	14,991	59,489	238,581
l2_block_rollup_simulation_time_in_ms	10,645	42,297	170,337
l2_block_public_tx_process_time_in_ms	4,314 (-1%)	17,115	67,980 (-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	15,280	29,387 (+1%)
note_history_successful_decrypting_time_in_ms	2,779 (-5%)	5,473
note_history_trial_decrypting_time_in_ms	118 (-7%)	183 (+24%)
node_database_size_in_bytes	3,620,065	3,727,920
pxe_database_size_in_bytes	29,923	59,478

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	210	44,709	25,561
private-kernel-ordering	137	30,953	14,809
base-rollup	1,074	128,374	881
root-rollup	82.6	4,088	889
private-kernel-inner	287	71,236	25,561
public-kernel-private-input	202	31,891	25,561
public-kernel-non-first-iteration	200	31,933	25,561
merge-rollup	9.76	2,608	881

Miscellaneous

Transaction sizes based on how many contracts are deployed in the tx.

Metric	0 deployed contracts	1 deployed contracts
tx_size_in_bytes	15,487	31,879