electrum – What is the maximum channel capacity allowed on the Bitcoin testnet?

Using Electrum desktop wallet connected to the testnet, when trying to open a channel with the amount exceeding 0.16777215 BTC I get the following:

Could not open channel. Exception(‘Requested channel capacity is over protocol allowed maximum’)

Is 0.16777215 BTC hardcoded in Electrum or is it determined by the testnet itself?
I noticed that on the mainnet the maximum capacity is siginificatly higher as some exchanges allow LN withdrawals of 0.5 BTC.

lightning network – What are the best practices to close and reopen channels in order to increase capacity

I am new in the lightning so I opened a small channel with 50k sats to get started. After some research and try-and-error I would like to increase the capacity of this channel. I know that this is not possible and the only way to do that is to close the channel and open a new one since having a double channel with the same node is not recommended.
In the meanwhile a payment has been routed with this channel, so my local balance is 10k sats and in the remote balance is 30k (10k sats are gone on fees). If I close the channel now I will only get 10k sats minus fees. I will lose more than 80% of my initial amount!

The only thing I can think of is doing a rebalance of the channel so the most of the capacity is on my side and then close the channel. But since it only has 50k sats I cannot do a loop in (minimum 250k sats), or balance of satoshi (minimum 50k sats). Circular rebalance fails all the time. As an alternative I can create an invoice and route it to my self as described here (https://github.com/lightningnetwork/lnd/pull/3736).

But is it ok what I am doing? Is there a cheaper (smarter) way?

unity – How an I set List with initial capacity?

unity – How an I set List<Transform> with initial capacity? – Game Development Stack Exchange

information theory – Capacity of Binary Erasure Channel

Consider the the binary erasure channel, with input and output alphabet ${0,?,1}$ and channel matrix
begin{bmatrix}
1-lambda-mu & mu & lambda\
0 & 1 & 0\
lambda & mu & 1-lambda-mu
end{bmatrix}

I want to determine its capacity, i.e. maximize $I(X;Y)$ over the probabilities distribution of the input.

I have tried writing and rewriting $I(X;Y)$ in different ways but the expression gets too complicated and I can’t find a way to assign values to $p(x)$ so that $I(X;Y)$ is maximized. Any suggestions? Thank you in advance.

mariadb – Exact meaning of “[ERROR] InnoDB: The age of the last checkpoint is NNN, which exceeds the log capacity NNN”

My understanding is that InnoDB will write transactions to the redo logs, and will run out of space in the redo logs if dirty pages exist in the buffer pool with LSNs lower than the lowest LSN observed in the redo logs.

Therefore, I can see two possible meanings of the error message

(ERROR) InnoDB: The age of the last checkpoint is NNN, which exceeds the log capacity NNN:

  1. InnoDB is simply warning that the database was forced to freeze up and write some dirty pages to disk, which is happening because the redo logs are not as large as they should ideally be (as specified by the innodb_log_file_size variable).

  2. InnoDB needed to write a transaction to the redo logs, and even after writing all dirty pages to disk, it was still not possible to evict records from the redo logs in order to make space for the new transaction. Therefore the transaction had to be aborted, since it was not possible to write it into the redo logs in order to allow the commit to complete. Perhaps this was due to a single transaction being larger than the entire redo log capacity, or maybe there was another reason related to the way that fuzzy checkpointing works. Therefore this should be treated as a real ERROR that caused a transaction to fail, and not just as a warning about redo log capacity being lower than the ideal amount.

Which of these two possibilities could have resulted in the ERROR?

This error occurred while shutting down a MariaDB 10.5.8 instance that had been running for several months, with innodb_buffer_pool_size = 2GB and innodb_log_file_size = 256MB. It’s confusing me that this only happened during a shutdown. There must be something about the sharp checkpointing at shutdown that triggers the error in a way that ongoing fuzzy checkpointing does not.

capacity planning – Required server capabilities for a video platform?

I’m a programmer and I have made a video playing platform. But I’m not sure about hardware requirements for such a system.

I think this platform will have some 10000 customer in the beginning. I do not know how to calculate but let’s take these 10000 people will spend at least one hour watching videos there.

What are server requirements for such a platform or how to calculate these specifications?

channel capacity management – How can I make my node a Lightning routing node?

It can be done, but it’s not trivial. Technically, in order to be able to route payments, you need liquidity in both directions, incoming as well as outgoing. If you just funded two channels, you only have outgoing liquidy now (all the money is on your side).

There are many ways to gain incoming liquity. You could spend or swap the funds in your channels (or a part of them). You could ask someone to open a channel to you (https://lnbig.com seem to give these away for free). You could buy liquidy from https://lightning.engineering/posts/2020-11-02-lightning-pool/.

But that’s just the beginning. If you really want to contribute, you need to always manage your node so that it provides routes where people need them. This is an art and you can surely find more hints by googling.

There are some developments underway to automate this process. If you used c-lightning instead of LND, you could try the clboss plugin, which has the goal of making all these choices without user input. Your mileage may vary.

Trying to buy a replacement battery but I worry about whether it will be compatible due to the differnce in voltage and capacity

I’m going to replace my HP 740004-121 OA04 battery,the originally is 14.8v but the one I’m looking to buy is only 14.4v. Would this not power my computer fully or not fit or be dangerous in any way?It also has less capacity will it totally not work in my laptop?

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