Ordering Coretime
There are two types of coretime:
- Bulk coretime - rent computation for an amount of time in advance (i.e., 28 days), requires renewal.
- On-demand coretime - buy computation on-demand on a per block basis, requires sending an extrinsic to order a block.
For EduChain, we mostly use on-demand coretime and place order when we need to test something.
Ordering on-demand coretime
Ordering via CLI
You can use the polkadot-js-api to call any extrinsic, including on-demand coretime for your parachain.
Ensure you have it installed:
yarn global add @polkadot/api-cli
# or
npm -g install @polkadot/api-cli
Once installed, you can send the extrinsic as follows. Be sure to supplement a seed phrase with ROC (faucet here) and also replace PARA_ID with your parachain's ID on Rococo:
polkadot-js-api tx.onDemandAssignmentProvider.placeOrderAllowDeath \
1000000000000 \
PARA_ID \
--seed "your seed here" \
--ws "wss://rococo-rpc.polkadot.io"
If you wanted, you could even do something a bit silly, such as have a shell script which orders a block every six seconds:
while :
do
polkadot-js-api tx.onDemandAssignmentProvider.placeOrderAllowDeath \
1000000000000 \
PARA_ID \
--seed "your seed here" \
--ws "wss://rococo-rpc.polkadot.io"
sleep 6
done
Ordering via PolkadotJS
Use the following guides to order on-demand coretime through PolkadotJS.