Displaying 5 results from an estimated 5 matches for "mmnoflush".
2012 Oct 02
1
ffsave problems
...0d86b45b04.ff"
.. .. ..- attr(*, "pagesize")= int 65536
.. .. ..- attr(*, "finalizer")= chr "delete"
.. .. ..- attr(*, "finonexit")= logi TRUE
.. .. ..- attr(*, "readonly")= logi FALSE
.. .. ..- attr(*, "caching")= chr "mmnoflush"
.. ..- attr(*, "virtual")= list()
.. .. ..- attr(*, "Length")= int 65640757
.. .. ..- attr(*, "Symmetric")= logi FALSE
.. .. ..- attr(*, "ramclass")= chr "Date"
.. .. ..- attr(*, "class")= chr "virtual"
.. .. - a...
2010 Jan 22
0
New version of package ff
...erformance problems with ff, here is a couple of recommendations based on FAQs:
1) Compare the size of data to be written at the same time to available RAM for your filesystem cache.
If the data exceeds available RAM, then consider using caching="mmeachflush" instead of caching="mmnoflush", this will make write operations predictably slower but prevent write storms stalling some systems (observed under NTFS win32+64).
You can set ff's caching option
either with options(ffcaching="mmeachflush") before creating ff objects
or create ff objects with ffobj &l...
2010 Jan 22
0
New version of package ff
...erformance problems with ff, here is a couple of recommendations based on FAQs:
1) Compare the size of data to be written at the same time to available RAM for your filesystem cache.
If the data exceeds available RAM, then consider using caching="mmeachflush" instead of caching="mmnoflush", this will make write operations predictably slower but prevent write storms stalling some systems (observed under NTFS win32+64).
You can set ff's caching option
either with options(ffcaching="mmeachflush") before creating ff objects
or create ff objects with ffobj &l...
2012 Oct 01
3
ffbase, help with %in%
Hello to everyone.
I'm trying to use the %in% to match to vectors in ff format.
a<-as.ff(data[,1]) %in% fire$fecha
> aff (open) logical length=3653 (3653)
[1] [2] [3] [4] [5] [6] [7] [8] [3646]
FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE : FALSE
[3647] [3648] [3649] [3650] [3651] [3652] [3653]
FALSE FALSE FALSE FALSE FALSE FALSE
2012 May 02
6
Quickest way to make a large "empty" file on disk?
R-helpers:
What would be the absolute fastest way to make a large "empty" file (e.g.
filled with all zeroes) on disk, given a byte size and a given number
number of empty values. I know I can use writeBin, but the "object" in
this case may be far too large to store in main memory. I'm asking because
I'm going to use this file in conjunction with mmap to do parallel