Error sending 1 million testnet Grin

[transatoshi-mw]

Describe the bug
Cant send a million tGrin from wallet via slatepack.

To Reproduce
Steps to reproduce the behavior:

1. Entered 'grin-wallet send 1000000'.
2. Error back is 'Wallet command failed. LibWallet Error: Wallet store error: Serialization error: too large read'.
3. This is a tx of all coinbase outputs of tGrin.

OS: Debian 12
grin-wallet V5.3.3

[Anynomouss]

I think you should have a look at the transaction size due to that many input. My guess would be that the total size is larger than what a single block can handle. It is of course not possible to exceed the maximum block space. This is just a guess though, it should matter how large the total amount is, it is all about data limit.

[transatoshi-mw]

I was told it should be possible by yeastplume, and after further testing the limit to send grin is ~100k which is pretty bad

[Anynomouss]

Ok, but how many outputs used as inputs were in that transaction? You can first send yourself 10x 100k test grin to aggregate all those outputs (120000/60=2000 outputs as input for a single transaction). Then try sending yourself 1 million.
See if that works.

[transatoshi-mw]

It's all coinbase outputs which would put ~16,666 of them at a total size of 566KB (16,666 * 34bytes). The only restriction on size I could find is that the maximum size for an armored SlatepackMessage string is 1MB. I will try your idea of aggregating the outputs to 100kツ each and try to send to myself in a little while.

[transatoshi-mw]

Also this is a duplicate of:

#472

Which states there might be a soft limit of 500 inputs per tx.

[Anynomouss]

@transatoshi-mw Did you find time to try first aggregating and then sending a larger amount?