17
votes
Accepted
How does buying and selling RAM work on EOS?
Buying/Selling uses the Bancor algorithm to sell the limited supply at market prices and buy it back at market prices when it is not needed anymore.
Market prices will be impacted based upon ...
- 1,434
14
votes
Accepted
How to get current (last) RAM price?
Yes you're on the right track.
Running
cleos -u https://nodes.get-scatter.com:443 get table eosio eosio rammarket
gives you:
{
"rows": [{
"supply": "10000000000.0000 RAMCORE",
"base": ...
- 885
13
votes
Accepted
How to calculate the RAM size of a contract in EOSIO and then i can know how much EOS i need to pay for every contract
/libraries/chain/include/eosio/chain/config.hpp defines setcode_ram_bytes_multiplier to 10x the number of bytes of the compiled WASM.
This covers the overhead of the VM and other memory. This is ...
- 1,434
13
votes
Accepted
Removing contract to release RAM - the smallest contract possible
Update 19th September: As of v1.3.0, it is now possible to delete the smart contract from an account using the --clear flag ($ cleos set contract <account> --clear)
To make a small contract, I ...
- 5,554
11
votes
Accepted
What is the Bancor algorithm and how it is used for RAM trading?
Traditionally, price discovery is achieved through buying and selling with bids and asks. Liquidity, or the relative ability to move larger sums of assets with low price slippage, was created by ...
- 3,425
10
votes
Accepted
How to increase RAM on Jungle testnet?
You can use the buyram action of system contract.
The above transaction can be performed using cleos as shown below.
cleos --url <jungle-testnet-url> system buyram <payer-account> <...
- 191
7
votes
How can I see where I'm using my EOS RAM?
There is currently no method to know which tables your RAM is sitting in. The only way you could figure this out is to look at everything you ever did, check the code for the smart contracts where you ...
- 4,744
6
votes
Accepted
Who will get the ram back when delete records?
When a record is created, the user specified in the emplace call will be charged for the RAM usage. A subsequent modify call on that record will specify a user (possibly different) that will be ...
- 1,844
6
votes
Accepted
Clearing RAM tables of eosio.token contract
UPDATE:
Updated the code to compile with eosio.cdt version 1.6.1.
I finally got it working nicely! Parsing the token symbol in the action parameters was especially complicated.
The other solution ...
- 1,087
6
votes
What is the typical RAM size of smart contract?
For some examples, you can check the sizes of the wasm files in EOSIO contracts (sizes are approximate):
$ ls -l eos/build/contracts/* | grep wasm | awk 'BEGIN {print "SIZE \t NAME"} {sum+= $5; n++; ...
- 5,554
6
votes
Accepted
Is there a flaw in deciding who can pay for RAM?
Yes, I believe that your understanding is correct, as confirmed in a discussion on Telegram Developers Channel pasted below--Todd Fleming is a contributor to EOSIO codebase:
16th of August
User: ...
- 5,554
6
votes
I'm still wrapping my head around EOS RAM and CPU resources. How do they work exactly?
EOS account can choose to buy ram or cpu? Can they not buy any at all?
You need RAM for the nodes to store data about your account,--including account name, public keys, and other meta-data--in the ...
- 5,554
5
votes
Is there a math error in Bancor paper?
The forumula is ambiguous over "when" in time you read the balance (before or after). For all of my testing I was never able to get the paper's formula to work without giving profits to users.
- 1,434
4
votes
How does buying and selling RAM work on EOS?
According to Dan Larimer, in Dawn 4 RAM can be bought at the current market price. If, later on, the RAM is no longer needed, the developer can sell the RAM at the then current market price. ...
- 1,844
4
votes
How does buying and selling RAM work on EOS?
Please read Introducing EOSIO Dawn 4.0 where it is explained in details.
The TL;DR is that RAM will be bought and sold at market price (but that's an oversimplification - you should refer to the ...
- 885
4
votes
Accepted
Is there a math error in Bancor paper?
After considerable thought and discussions with other people, I affirm that there is no error in Rosenfeld's Bancor paper as Dan Larimer suggests.
Therefore, there seems to be no theoretical ...
4
votes
Accepted
How is the ram reallocated when a table is modified?
userb picks up the entire ram cost. usera gets their ram back:
reference here: https://github.com/EOSIO/eos/blob/v1.0.8/libraries/chain/apply_context.cpp#L459
- 166
4
votes
Accepted
How can the payer for the modified table = 0?
This line indicates that passing 0 in the payer argument keeps the existing payer for the entry.
https://github.com/EOSIO/eos/blob/v1.0.8/libraries/chain/apply_context.cpp#L456
- 166
4
votes
How RAM was allocated in dapp and how to optimize the table?
I don't know how you calculated your contracts RAM consumption, but the devil lies in the details.
Index Basics
Using an index is always connected to sacrify some memory for speed. This is a well ...
tmm♦
- 2,114
3
votes
Accepted
How to calculate memory quota, net bandwidth and cpu bandwidth limit in an account?
You can do that by simply running cleos get account youraccount, also you can check it out in https://eosflare.io
Finally, if you want to have a better understanding about EOS RAM and Bandwith check ...
- 3,023
3
votes
Accepted
Can I build EOSIO with less than 7GB of RAM? | Answer: Yes
Minimum requirements:
4GB RAM
2 cores
The auto build script (./eosio_build.sh) capures your OS and selects the build script in ~/eos/scripts/ for your OS. You can nano your OS's build shell and ...
- 3,425
3
votes
Accepted
How can we know the usage of ram for eos?
Usage of RAM for an account:
$ cleos get account <account_name>
Maximum RAM of the network (max_ram_size):
$ cleos get table eosio eosio global
Unused RAM of the network:
$ cleos get table ...
- 5,554
3
votes
Accepted
Do I get RAM back after deploying a contract?
You answered your own question in a few minutes, but I'll post this anyway since I typed it out.
Let's say you deploy an eosio.token contract that allows users to create their own 0 balance to opt ...
- 3,425
3
votes
How to solve "Account using more than allotted RAM usage"?
You can buy more RAM for your account xxxxx:
cleos system buyram xxxxx xxxxx "10 EOS"
- 133
3
votes
Accepted
What is the ChainBase database used for?
1.What is chainbase used for?
we can find the answer in :
about chainbase
2.when we add a new object (i.e., row) to the table by Multi-Index such as
class addressbook: contract {
struct ...
- 163
3
votes
Accepted
Why do token transfers on EOSIO consume RAM?
I don't think the other answers clarify this aspect, so I'll post this as well:
I just can't figure out why token transfers on EOS are stored in (expensive) RAM and not just simply in the ...
- 5,554
3
votes
When to use RocksDB compared to Chainbase?
RocksDB intended use is to perform better than Chainbase with data sets that have larger (64KiB+) data associated with the average row in the database and data access patterns that favor fewer highly ...
- 452
2
votes
What EOS Chain Information/Interaction do you wish was more publicly available?
Just a quick shot:
Search for blocked/still available names and namespaces like it's done when buying an domain online
Cost calculator for creating an account
- 203
2
votes
Accepted
What EOS Chain Information/Interaction do you wish was more publicly available?
Great idea, I would love to use that.
If you need any help, I may use some spare time to participate.
in addition to 5. voting:
stats for BPs (e.g. how long have they have been active as BP, missed ...
tmm♦
- 2,114
2
votes
Accepted
How RAM is managed between PBs
From the white paper
"Bandwidth and computation have two components, instantaneous usage and long-term usage. A blockchain maintains a log of all Actions and this log is ultimately stored and ...
- 1,596
Only top scored, non community-wiki answers of a minimum length are eligible