为什么我不能在 R x64 中设置 memory.limit 超过 4GB？

Question

I can't increase my memory limit above approx 4GB in R (Windows 10). I have 128 GB of RAM. I've heard there's a bug in R studio, so I went directly into the R console. It's still not working. Ideas?

memory.size()
[1] 4135.24

memory.size(max=TRUE)
[1] 4196.69

memory.limit(size=128000)
[1] 130980
Warning message:
In memory.limit(size = 128000) : cannot decrease memory limit: ignored

And...FYI:

sessionInfo()
R version 3.6.1 (2019-07-05)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18362)

Thanks!

Answer 1

I realize this question is rather old, but as I don't see an answer to the question...

To increase your memory limit, specify a number greater than the value returned by

memory.limit(max = NA)

for the size argument in memory.limit() , eg,

memory.limit(size = 133120)

memory.limit(size = 128000) returns an error because your system's memory limit is already greater than 128000. Your current limit is 130980, the value returned by memory.limit() .

To see your current memory limit, run:

memory.limit(max = NA)

memory.size(max = TRUE) returns a relatively small value because it returns "the maximum amount of memory obtained from the OS," rather than your memory limit (see https://www.rdocumentation.org/packages/utils/versions/3.6.2/topics/memory.size ). (Whether that max is in the current session, ever, the current R version... I don't know.)

For comparison, on R with ~8 GB memory limit:

memory.size()
#> [1] 50.7
memory.size(max = TRUE)
#> [1] 52
memory.limit(size = 1)
#> Warning in memory.limit(size = 1): cannot decrease memory limit: ignored
#> [1] 8042
memory.size(max = NA)
#> [1] 8042.05

^{Created on 2022-03-20 by the reprex package (v2.0.0)}