Main objective :
The purpose of the tests was to create a simple TPS measurement method (transactoins per second) of POA ethereum networks with different parameters and for different types of transactions.
Networks and Parameters :
2 types of networks were used for tests:
- vcnet5 - (5 sec block_period, 4700000 GasLimit)
- vcnet2 - (1 sec block_period, 23000000 GasLimit)
Testing scheme
Contracts
To ensure a significant difference in the value of a single transaction, two contracts were created.
- Addchunk - an unindexed array of structs (cost per tx ~ 156к Gas)
- Counter - just simple counter (cost per tx ~ 27к Gas)
Transactions generators
- benchmark_tr.py Description: generator TX to vcnet using Contract AddChunk. Single thread. Call a functions.addChunkInfo with 20 ms delay in 600s.
- benchmark_tr2_thread.py Description: Advanced generator TX to vcnet2 using Contract AddChunk. Multithread. Call N:10000 function.addChunkInfo() via multi-threading queue with M workers.
- benchmark_tr2_counter.py Description: generator TX to vcnet2 using Contract Counter. Single thread. Call a function incrementCounter() with 2 ms delay in 600s.
- benchmark_tr2_thread_counter.py Description: Advanced generator TX to vcnet2 using Contract Counter. Multithread. Call N:10000 function incrementCounter() via multi-threading queue with M:2-5 workers.
- benchmark_tr2_send.py Description: generator TX to vcnet2 without smart-contract. Single thread. Send a N wei from eth.coinbase to pre-defined eth-node (vcnet2) using RAW transaction.
Measurement tool
- txpool2.py 2> log.file Description: Measurer state txpool in network (via w3 RPC) and counter mined, pending and queued transactions in poa network per time. Worked together with generator. log.file source for plot.
Abstract calculations for TPS
With accoradance to Ethereum Yellow book, theoretical limit for TPS described as:
-
tps = gaslimit / transaction_cost * block_period;
-
the minimal cost of transaction in Ethereum is 21000 wei
Thus we can estimate the theoretical limits for our two networks and two contracts
- tps = 6 (vcnet5, addchunk)
- tps = 35 (vcnet5, counter)
- tps = 147 (vcnet2, addchunk)
- tps = 852 (vcnet2, counter)
Report
Full scope of results with more interested graphs is represented in report