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multimeric/memory.md

Created March 14, 2024 00:24
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Demonstration of odd memory usage in R whereby the resident set size (RSS) doesn't change despite allocating more memory and later clearing it
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memory.md 
RSQLite::SQLite() |>
  DBI::dbConnect(":memory:") |>
  RSQLite::dbWriteTable("foo", data.frame(
  a = numeric(1E8)
))
invisible(gc())
ps::ps_memory_info()
##        rss        vms     shared       text        lib       data      dirty 
## 1076400128 1299771392   10223616       4096          0 1074139136          0

y <- integer(1E8)
ps::ps_memory_info()
##        rss        vms     shared       text        lib       data      dirty 
## 1076400128 1299771392   10223616       4096          0 1074139136          0

rm(y)
invisible(gc())
ps::ps_memory_info()
##        rss        vms     shared       text        lib       data      dirty 
## 1076400128 1299771392   10223616       4096          0 1074139136          0
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