Installer vmtouch avec Homebrew, apk, apt, dnf, MacPorts, Nix, zypper

Liens du projet

• Page d'accueil
• Dépôt
• Docs amont
• Page du gestionnaire de paquets

Commandes et alias

• vmtouch

Historique du projet

The upstream README identifies vmtouch as Doug Hoyte's project, with copyright years 2009-2017 and contributors tracked in the CHANGES file. The changelog records 0.7.1 as the first public release, followed by portability work for Solaris, OS X, and HP-UX by the 0.8.0 release in December 2012.

The 2015-2018 releases show the tool maturing from a cache-inspection utility into a more scriptable systems tool. Version 1.0.1 added page-range support, version 1.1.0 improved large-value checking and Linux block-device handling, version 1.2.0 added include/exclude filename patterns, version 1.3.0 added batch input mode, and version 1.3.1 added PID-file support for daemonized memory locking.

Historique d'adoption

vmtouch's adoption story is mostly that of a niche tool spreading across Unix-like operating systems because it maps directly to common performance investigations. The manual lists confirmed support for Linux, FreeBSD, Solaris, OS X, and HP-UX, while noting that eviction support varies by kernel API.

Modes d'utilisation

With no options, vmtouch reports cache residency by mapping files read-only and querying resident pages with `mincore`. Operators use `-t` to fault pages into cache, `-e` to ask the OS to evict pages, and `-l` or `-L` to lock pages in physical memory for as long as the process runs. Directory recursion, page ranges, ignore/include patterns, and batch lists make it usable against large trees.

Pourquoi les passionnés de paquets s'y intéressent

vmtouch is significant in package-manager culture because it gives administrators a repeatable way to demonstrate and manipulate the otherwise invisible filesystem cache. It is especially handy for benchmarking, warming hot datasets, testing cold-cache behavior, and explaining why a second run of a workload is faster than the first.

Chronologie

• 2009: Doug Hoyte begins vmtouch, according to the upstream copyright range.
• 0.7.1: First public release, per the CHANGES file.
• 2012-12-04: Version 0.8.0 adds full OS X support and HP-UX support.
• 2015-10-16: Version 1.0.1 adds page-range mode.
• 2017-03-16: Version 1.3.0 adds batch mode and filesystem-boundary traversal control.
• 2018-11-16: Version 1.3.1 adds PID-file support for daemon mode.

Related projects

• vmtouch is conceptually adjacent to `vmstat`, `touch`, and OS primitives such as `mincore`, `mlock`, `msync`, `madvise`, and `posix_fadvise`; the upstream manual lists those interfaces as related references.

Sources

• vmtouch CHANGES: https://raw.githubusercontent.com/hoytech/vmtouch/master/CHANGES
• vmtouch README: https://raw.githubusercontent.com/hoytech/vmtouch/master/README.md
• vmtouch manual: https://raw.githubusercontent.com/hoytech/vmtouch/master/vmtouch.pod