Category: News

A crucial but often entirely transparent feature of a modern package management system like Debian’s APT is its solver – basically the set of rules and instruction on how to handle dependencies when installing a package. APT is currently in the process of radically changing its solver, the first bits of which can be found in APT 2.9.3, referred to as solver3. Many of the changes and improvements get a little into the weeds and will mostly be transparent to users, but there is one feature the new solver will enable that many of you will be incredibly excited about. One of the core new capabilities of solver3 is the implication graph. As part of the solving phase, we also construct an implication graph, albeit a partial one: The first package installing another package is marked as the reason (A -> B), the same thing for conflicts (not A -> not B). ↫ Julian Andres Klode Seems rather innocuous at first sight, but here’s what the implication graph will make possible: The implication graph building allows us to implement an apt why command, that while not as nicely detailed as aptitude, at least tells you the exact reason why a package is installed. It will only show the strongest dependency chain at first of course, since that is what we record. ↫ Julian Andres Klode If you’ve ever dealt with packaging issues – probably when running -testing or similar unstable distributions that use APT, a command that tells you exactly why a package is installed is an absolute godsend. Sure, aptitude exists, but aptitude takes you out of your current CLI workflow, whereas this will be much easier to quickly run. There’s more features solver3 will enable, but this one is definitely one of my favourite low-level additions to APT in a long, long time.

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Popular national café chain Pret a manger is to open a second location in Worthing after its first branch opened in Worthing town centre last year. This one will be at the BP service station in Brighton Road.

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Mon, 05/13/2024 – 17:19

https://2n.pl/blog/hanami-shrine-file-handling-in-hanami
Showing an simple, flexible file handling solution in hanami, with ROM-rb ORM, using Shrine. Also contains some of my thoughts on active-storage in comparison to shrine.

Is the classical TCP congestion control mechanism known as
Nagle’s algorithm
(RFC 896 – Congestion Control) headed for the scrap heap of history?

A recent post on tech@ titled Add sysctl to disable Nagle’s algorithm (RFC 896 – Congestion Control) from Job Snijders (job@) with a patch to implement the disabling sysctl indicates that some at least think that deprecation is in order.

The message leads in,

List:       openbsd-tech
Subject:    Add sysctl to disable Nagle's algorithm (RFC 896 - Congestion Control)
From:       Job Snijders <job () openbsd ! org>
Date:       2024-05-13 18:41:55

Dear all,

Back in the early 1980s, a suggestion was put forward how to improve TCP
congestion control, also known as "Nagle's algorithm". See RFC 896.

Nagle's algorithm can cause consecutive small packets from userland
applications to be coalesced into a single TCP packet. This happens at
the cost of an increase in latency: the sender is locally queuing up
data until it either receives an acknowledgement from the remote side or
sufficient additional data piled up to send a full-sized segment.

Read more…