About Fee Limit Estimation

[abn2357]

Below is an introduction about fee limit estimation from official tutorial

I have 2 questions:

1. What is the mathematical relationship between energy consumption of last transaction and estimated fee limit?
2. Why choose the last transaction as the reference instead of the last transaction that calls the same function?

[angrynurd]

@abn2357

1.Why choose the last transaction as the reference instead of the last transaction that calls the same function?

Indeed, using the last call to the same function would provide a more accurate estimation of the transaction fee limit. The problem with using just the last transaction is that different functions have varying complexities, and different parameters can lead to different consumption levels, making it unable to reflect actual resource requirements.
I understand that TRON's current approach is mainly a trade-off in engineering - prioritizing system simplicity and maintainability at the cost of some accuracy.

2.What is the mathematical relationship between energy consumption of last transaction and estimated fee limit?

In my own opinion, mathematical relationship between last transaction and fee limit:

EstimatedFeeLimit = LastEnergyConsumption × Buffer × EnergyPrice × UserBearingRatio

Where:

• Buffer: typically 1.1-1.2 (10-20% extra)
• EnergyPrice: current sun/energy rate
• UserBearingRatio: portion user needs to pay (e.g., 10% if developer bears 90%)

[abn2357]

@abn2357

1.Why choose the last transaction as the reference instead of the last transaction that calls the same function?

Indeed, using the last call to the same function would provide a more accurate estimation of the transaction fee limit. The problem with using just the last transaction is that different functions have varying complexities, and different parameters can lead to different consumption levels, making it unable to reflect actual resource requirements. I understand that TRON's current approach is mainly a trade-off in engineering - prioritizing system simplicity and maintainability at the cost of some accuracy.

2.What is the mathematical relationship between energy consumption of last transaction and estimated fee limit?

In my own opinion, mathematical relationship between last transaction and fee limit:

EstimatedFeeLimit = LastEnergyConsumption × Buffer × EnergyPrice × UserBearingRatio

Where:

• Buffer: typically 1.1-1.2 (10-20% extra)
• EnergyPrice: current sun/energy rate
• UserBearingRatio: portion user needs to pay (e.g., 10% if developer bears 90%)

Thx for your reply. What does Buffer and UserBearingRatio mean here?