I'm not sure exactly what's happening, so I'll try to describe the steps
in detail. I get the same behavior with R 2.12.1 and R 2.13, OSX 10.6.6
or 10.6.4 .
First, I boot up Activity Monitor and set it to show memory usage.
I create a large object (in the R Console of R.app GUI) , such as
foo<-runif(1e8)
and the "real memory" in the table and "active memory" in the pie chart
go up. No surprise.
Then I get rid of foo,
rm(foo)
But the memory allocations don't change. Looks like a memory leak?
Two other things I found:
1) If I write a function that does nothing but create some big objects
like that, and then deletes them, ActivityMonitor shows memory
allocated to R and then freed up. This is what I'd expect from the
R.app GUI as well.
2) If I boot several other applications, using up all my RAM, at some
point the operating system moves some of R's active memory into virtual
memory. Now the funny thing: if I make R the foreground app, or if I
simply quit all the other apps, R does not get its active memory
allocation back. The 'pie chart' shows memory has been freed, not just
"inactive" .
Did I set some bad parameter in one of my config files? Is there some
way within R to force all that memory to be freed up (other than
quitting and restarting R)?
Thanks for your help -- I'm not the least put out if someone wants to
point out what a dummy I'm being.
Carl
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