cachem

Overview

About

Maintained by Winston ChangFirst published 2021-01-1810 releasesCRAN page ↗GitHub ↗

Key-value stores with automatic pruning. Caches can limit either their total size or the age of the oldest object (or both), automatically pruning objects to maintain the constraints.

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("cachem", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("r-lib/cachem")

Development version from r-lib/cachem. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-cachem

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-cachem

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-cachem

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

13OK

Slowest check: 1.1 min · r-oldrel-windows-x86_64

Code health

Yes

Tests · ratio 0.39

74.0%

Coverage · measured lines

100%

Documentation · exports

2

Dependencies · direct

Check history

OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 1,942 wordsVignettesNopkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 100%
Documented parameters: 100%
Return-value docs: 75%
References docs: 0%

Downloads

12.7M

CRAN downloads in the past year

Rank #57 · ~34.7K/day · ~1.1M/mo

Releases R versions

Daily download trend is not available in this view yet.

1M30 days

3.2M90 days

12.7M1 year

Compare downloads with other packages →

Also on148.1K r2u10 autocran1.1M conda_forge4K c2d4u

Repository

GitHub ↗ r-lib/cachem

65Stars

16Forks

11Open issues

4Open PRs

10Releases

170Commits

10Contributors

170 commits · Last activity 2025-10-20 · 0% stars, 30d

Stars over time

2024-11-05 · 582026-07-07 · 65

Repository practices

Upstream repositoryBeta

6 development-tooling and community-health practices detected across 5 families in the upstream repository

Checks run against github.com/r-lib/cachem on 2026-07-19.

Continuous integration (1)

GitHub Actions

Reproducibility and dev environment (1)

Makefile

CRAN release process (2)

cran-comments.mdrevdep/

Docs source (1)

README.Rmd

Show all practices

Lint, format, editor (1)

RStudio project

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

3 external dependencies (excludes base and recommended)

Depends (0)

none

Imports (2)

rlang fastmap

LinkingTo (0)

none

Suggests (1)

testthat

Enhances (0)

none

Dependency license breakdown →

Code & Tests

Code Composition

R 1,994 (80%)Rd 446 (18%)C 41 (2%)

Code characteristics

Object systems

S32

Cyclomatic complexity: 2.0 median / 48 max
Test cases: 23 / 0.39 per code line

Test coverage

Line coverage

74%

Expression

74.0%

Tests / Examples

74.0% / 36% ex

Functions

13 3 exported

Complexity

9.5 avg / 48 max

Call network

13 nodes / 6 edges

Call graph

Open call graph →

Loading call graph…

Lowest coverage

13 functions

Function	Cyclo	Coverage
cache_layered exp	10	0%
absolute_path	2	0%
dir_remove	5	0%
format.cachem	1	0%
format_args	2	0%
format_methods	2	0%

People & History

People (2)

Maintainer (1)

Winston Chang

Author, Maintainer

Authors (1)

Winston Chang

Author, Maintainer

Copyright holders (1)

Posit Software, PBC

Copyright holder, Funder · added in 1.1.0

Funders (1)

Posit Software, PBC

Copyright holder, Funder · added in 1.1.0

Listed in earlier versions (1)

RStudio

no longer listed · 1.0.0 to 1.0.8

Package Timeline

10 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
1.1.0Latest
2024-05-16 · current release · diff ↗
R
R 4.4.0 released · 2024-04-24
1.0.8
2023-05-01 · diff ↗
R
R 4.3.0 released · 2023-04-21
1.0.7
2023-02-24 · diff ↗
R
R 4.2.0 released · 2022-04-22
1.0.6
2021-08-19 · diff ↗
R
R 4.1.0 released · 2021-05-18
1.0.5
2021-05-15 · diff ↗
1.0.4
2021-02-13 · diff ↗
1.0.3
2021-02-04 · diff ↗
1.0.2
2021-02-03 · diff ↗
1.0.1
2021-01-21 · diff ↗
1.0.0
2021-01-18

Show 1 earlier events

R
R 4.0.0 released · 2020-04-24

Package metadata

First published: 2021-01-18
Total releases: 10 / 5 yrs
License: MIT + file LICENSE OSI
Download size: 27 KB
Installed size: not tracked yet
With dependencies: not tracked yet