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Results tagged with gas
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user 160
Gas is a 'sub-currency' which enables the EVM and Ethereum's decentralised computer to run -- with each operation, an amount of gas (proportional to the computational effort required to perform the operation) is consumed.
5
votes
2
answers
153
views
Why not use mining power to execute contracts?
Ethereum developers certainly considered the idea of using mining power to do useful work - i.e., run contracts - rather than "waste" it with meaningless hashes. I'm interested in knowing what have be …
- 3,177
6
votes
2
answers
2k
views
How do you compute the right amount of gas and tax to transfer certain amount of money?
You want to transfer all the money in an account and want to compute the right amount of gas and tax suc that you transfer all that is possible and leave the account with 0. … You want to transfer a specific amount of money and want to compute the right amount of gas and tax such that you transfer exactly the desired amount.
How do you compute both values? …
- 3,177
7
votes
2
answers
198
views
Why setting fields of a memory object and then storing it all at once is more expensive than...
Mind the following code:
// This is expensive
obj.a = uint32(obja);
obj.b = uint32(objb);
obj.c = uint32(objc);
objs[objName] = obj;
// This is much cheaper
objs[objName].a = uint32(obja);
objs[objN …
- 3,177
4
votes
How do you implement PubSub without running out of gas (attack vector)?
Then, you just find the subscribing cost as total_messages * message_cost, where message_cost is the gas used to run a single iteration of the loop. …
- 3,177
5
votes
1
answer
693
views
Is it possible to make several calls in a single transaction?
Suppose your contract has a very simple function, F(), which takes about 1,000 gas to process. Suppose you want to call that function 100 times. … Since there is an overhead of about 21,000 gas per transaction, you'll be paying 2,200,000 gas. …
- 3,177