- Version: 4.2-1
- License: BSD 2-Clause
- Project home: https://github.com/shinra-dev/memuse
- Bug reports: https://github.com/shinra-dev/memuse/issues
memuse is an R package for memory estimation. It has tools for estimating the size of a matrix (that doesn't exist), showing the size of an existing object in a nicer way than
object.size(). It also has tools for showing how much memory the current R process is consuming, how much ram is available on the system, and more.
Originally, this package was an over-engineered solution to a mostly non-existent problem, as a sort of love letter to other needlessly complex programs like the Enterprise Fizzbuzz. However, as of version 2.0-0, I'm sad to report that the package is actually becoming quite useful.
The package has been exhaustively tested on Linux, FreeBSD, Windows, Mac, and "other"-NIX. That is also roughly the platforms in descending order of support for the various operations. However, if you have a problem installing or using the package, please open an issue on the project's GitHub repository.
To install the R package, run:
The development version is maintained on GitHub:
The C internals, found in
memuse/src/meminfo/ are completely separated from the R wrapper code. So if you prefer, you can easily build this as a standalone C shared library.
The package comes with several classes of utilities. I find all of them very useful during the course of benchmarking, but some are certainly more useful than others.
With this package you can get some information about how much memory is physically available on the host machine:
Sys.meminfo() # Totalram: 15.656 GiB # Freeram: 10.504 GiB Sys.meminfo(compact.free=FALSE) ### Linux and FreeBSD only # Totalram: 15.656 GiB # Freeram: 1.067 GiB # Bufferram: 1.332 GiB # Cachedram: 8.207 GiB Sys.swapinfo() ## same as Sys.pageinfo() # Totalswap: 32.596 GiB # Freeswap: 32.595 GiB # Cachedswap: 444.000 KiB
You can find the ram usage of the current R process:
Sys.procmem() # Size: 258.426 MiB # Peak: 258.426 MiB x <- rnorm(1e8) memuse(x) # 762.939 MiB rm(x);invisible(gc()) Sys.procmem() # Size: 258.426 MiB # Peak: 1021.363 MiB
Also, if you're working close to the metal, you may be interested in seeing how large the CPU caches are and/or how big the cache linesize is:
Sys.cachesize() # L1I: 32.000 KiB # L1D: 32.000 KiB # L2: 256.000 KiB # L3: 6.000 MiB Sys.cachelinesize() # Linesize: 64 B
Estimating Memory Usage
You can estimate memory storage requirements of a matrix without having to divide by some annoying power of 2:
howbig(10000, 500) # 38.147 MiB howbig(10000, 500, type="int") # 19.073 MiB howbig(10000, 500, representation="sparse", sparsity=.05) # 1.907 MiB
Alternatively, given a (memory) size, you can also find the dimensions of such a matrix:
howmany(mu(800, "mib")) #  10240 10240 howmany(mu(800, "mib"), ncol=500) #  209715 500
For more information, see the package vignette.
The package also has some miscellaneous helpful utilities:
approx.size(12345) # 12.3 Thousand approx.size(123456789) # 123.5 Million approx.size(123456789, unit.names="short") # 123.5m approx.size(123456789, unit.names="comma") # 123,456,789
memuse is authored and maintained by:
- Drew Schmidt
With additional contributions from:
- Christian Heckendorf (FreeBSD improvements to meminfo)
- Wei-Chen Chen (Windows build fixes)
- Dan Burgess (donation of a Mac for development and testing)