Manual Architecture

[Marguerite Litscher]

TheGreen Streets Design Manual follows and complements the 2012 Complete Streets Design Handbook. This manual extends environmental sustainability into the physical design of the street, showing how stormwater management is improved through porous materials and vegetation.

In larger systems, it is often easier to have multiple Ignition installations to help split the load between the front-end tasks and the back-end tasks. This is perfect for single large systems that aren't split up into different sites. In those cases, the Hub and Spoke Architecture is usually a better fit.

In the Scale Out Architecture, we have at least one Gateway that handles back-end communications. The back-end Gateway deals with all PLC and device communications. The front-end Gateway handles all of the Clients, serving up the data pulled from the back-end Gateway. This is made possible through the Gateway Network, connecting Gateways to each other, and allowing Tags to be shared through remote Tag providers.

The best thing about the Scale Out Architecture is that it is easy to scale up Ignition as your system grows. In the image below, we added more front-end Gateways to help handle an increase in clients, and a Load Balancer to automatically distribute the clients between them.

New in 7.9.15Launching clients behind a load balancer works as of 7.9.15, but the projects on each Gateway MUST have identical UUIDs, meaning that all visualization gateways must be restored from the same Gateway backup (GWBK), as project imports won't work.

Scale Out is utilized in large systems to distribute the workload across multiple servers. This is in contrast to a 'Scale Up' ideology where you have a single powerful server manage the whole system.

In this architecture, each server only deals with a small part of the overall system. Should a server fault, only that part fo the system is hindered, allowing other parts in organization to continue uninterrupted. Applying Redundancy to the Tag & I/O servers is ideal to maximize uptime.

Improving performance in this architecture is simple: add another Gateway where appropriate. Because the system is spread out on purpose, it's easy to determine which kind of Gateway to add. A Back-End Gateway would help if you're adding new PLCs, and a Front-End Gateway will help when more clients need to be active at a time.

The RISC-V instruction set architecture (ISA) and related specifications are developed, ratified and maintained by RISC-V International contributing members within the RISC-V International Technical Working Groups. Work on the specification is performed on GitHub, and the GitHub issue mechanism can be used to provide input into the specification.

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Recognizing that buildings are a major contributor to global warming and the critical role of embodied versus operational carbon, the book focuses on houses built from materials that either sequester carbon (plants), use materials with very low embodied carbon (earth and stone) or reuse substantial amounts of existing materials. Organized by those materials (wood, bamboo, straw, hemp, cork, earth, brick, stone and re-use), and incorporating life cycle diagrams demonstrating how the raw material is processed into building components, the book shows how the unique properties of each material can transform the ways architects conceive the sections of houses.

The house was selected as the vehicle for these investigations due to its scale, its role as a site of architectural experimentation, and its ubiquity. Building on the techniques of the Manual of Section, the book is comprised of newly generated cross-sectional drawings of fifty-five recent, modestly sized houses from around the world, making legible the tectonics and materials used in their construction. Each house is also shown through exploded axonometric, construction photographs and color photographs of the exterior and interior. Introductory essays set up the importance of embodied carbon, the role of vernacular plant-based construction and the problems of contemporary house construction. Drawing connections between the architecture of the house, environmental systems and material economies, the book seeks to change how we build now and for the future.

The package management system manipulates data represented in a commonformat, known as control data, stored in control files. Controlfiles are used for source packages, binary packages and the .changesfiles which control the installation of uploaded files. [1]

A control file consists of one or more stanzas of fields. [2] Thestanzas are separated by empty lines. Parsers may accept linesconsisting solely of spaces and tabs as stanza separators, butcontrol files should use empty lines. Some control files allow only onestanza; others allow several, in which case each stanza usuallyrefers to a different package. (For example, in source packages, thefirst stanza refers to the source package, and later stanzas referto binary packages generated from the source.) The ordering of thestanzas in control files is significant.

The field ends at the end of the line or at the end of the lastcontinuation line (see below). Horizontal whitespace (spaces and tabs)may occur immediately before or after the value and is ignored there; itis conventional to put a single space after the colon. For example, afield might be:

The value of a folded field is a logical line that may span severallines. The lines after the first are called continuation lines andmust start with a space or a tab. Whitespace, including anynewlines, is not significant in the field values of folded fields. [3]

The value of a multiline field may comprise multiple continuationlines. The first line of the value, the part on the same line as thefield name, often has special significance or may have to be empty.Other lines are added following the same syntax as the continuationlines of the folded fields. Whitespace, including newlines, issignificant in the values of multiline fields.

The first stanza of the control file contains information about thesource package in general. The subsequent stanzas each describe abinary package that the source tree builds. Each binary package builtfrom this source package has a corresponding stanza, except for anyautomatically-generated debug packages that do not require one.

These fields are used by dpkg-gencontrol to generate control filesfor binary packages (see below), by dpkg-genchanges to generate the.changes file to accompany the upload, and by dpkg-source whenit creates the .dsc source control file as part of a source archive.Some fields are folded in debian/control, but not in any othercontrol file. These tools are responsible for removing the line breaksfrom such fields when using fields from debian/control to generateother control files. They are also responsible for discarding emptyfields.

The fields here may contain variable references - their values will besubstituted by dpkg-gencontrol, dpkg-genchanges ordpkg-source when they generate output control files. SeeVariable substitutions: debian/substvars for details.

The Debian source package control file is generated by dpkg-source when itbuilds the source archive, from other files in the source package,described above. When unpacking, it is checked against the files anddirectories in the other parts of the source package.

The .changes files are used by the Debian archive maintenancesoftware to process updates to packages. They consist of a singlestanza, possibly surrounded by an OpenPGP signature. That stanzacontains information from the debian/control file and other dataabout the source package gathered via debian/changelog anddebian/rules.

In a binary package control file or a .changes file, the sourcepackage name may be followed by a version number in parentheses. [4]This version number may be omitted (and is, by dpkg-gencontrol) ifit has the same value as the Version field of the binary package inquestion. The field itself may be omitted from a binary package controlfile when the source package has the same name and version as the binarypackage.

List of the names and email addresses of co-maintainers of the package,if any. If the package has other maintainers besides the one named inthe Maintainer field, their names and emailaddresses should be listed here. The format of each entry is the same asthat of the Maintainer field, and multiple entries must be commaseparated.

This is normally an optional field, but if the Maintainer controlfield names a group of people and a shared email address, theUploaders field must be present and must contain at least one humanwith their personal email address.

When it appears in the debian/control file, it gives the value forthe subfield of the same name in the Files field of the .changesfile. It also gives the default for the same field in the binarypackages.

In the main debian/control file in the source package, this fieldmay contain the special value all, the special architecture wildcardany, or a list of specific and wildcard architectures separated byspaces. If all or any appears, that value must be the entirecontents of the field. Most packages will use either all or any.

Specifying a specific list of architectures indicates that the sourcewill build an architecture-dependent package only on architecturesincluded in the list. Specifying a list of architecture wildcardsindicates that the source will build an architecture-dependent packageon only those architectures that match any of the specified architecturewildcards. Specifying a list of architectures or architecture wildcardsother than any is for the minority of cases where a program is notportable or is not useful on some architectures. Where possible, theprogram should be made portable instead.

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