[R] gc() and gc trigger

[Pavel Khomski]

hello,

the question concerning to the memory used and g.c. after having removed 
objects.  What is wrong?

bevor
-------

 > gc()
                   used   (Mb)     gc trigger       (Mb)     max 
used      (Mb)
Ncells   313142     8.4         1801024         48.1       1835812      
  49.1
Vcells    809238     6.2     142909728   1090.4   178426948   1361.3



hier  all  attached objects  detached and other  no more used ones  
removed; also the objects which could change their size (like 
.Traceback) are checked; nothing unusual
-----


after
------

 >  for (i in 1:30) gc()
 >  gc()
                      used    (Mb)     gc trigger      (Mb)      max 
used      (Mb)
Ncells     313149        8.4       1152655       30.8          1835812   
    49.1
Vcells      809261        6.2       3218039       19.7     178426948   
1361.3


 > object.size(mget(ls(all=T),envir=.GlobalEnv)) / 1024^2
[1] 9.829926


N.B.!!! the "max used "  is not put back

 > q()

after having restarted R-prozess
-------------------------------------

 > gc()
                   used    (Mb)      gc trigger   (Mb)     max used      
(Mb)
Ncells  302497        8.1           467875    12.5          350000       
  9.4
Vcells   785346        6.0         1193335      9.2           
923612        7.1



thnks for hint



ps: some more understandable information about how R manages the memory 
and to the output of gc(), specially about  gc trigger would be helpful