Quickest way to make a large "empty" file on disk?
Something like: http://markus.revti.com/2007/06/creating-empty-file-with-specified-size/ Is one way I know of. Jeff Jeffrey Ryan | Founder | jeffrey.ryan at lemnica.com www.lemnica.com
On May 2, 2012, at 5:23 PM, Jonathan Greenberg <jgrn at illinois.edu> wrote:
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 writes to this file. Say, I want to create a blank file of 10,000 floating point numbers. Thanks! --j -- Jonathan A. Greenberg, PhD Assistant Professor Department of Geography and Geographic Information Science University of Illinois at Urbana-Champaign 607 South Mathews Avenue, MC 150 Urbana, IL 61801 Phone: 415-763-5476 AIM: jgrn307, MSN: jgrn307 at hotmail.com, Gchat: jgrn307, Skype: jgrn3007 http://www.geog.illinois.edu/people/JonathanGreenberg.html [[alternative HTML version deleted]]
_______________________________________________ R-sig-hpc mailing list R-sig-hpc at r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-hpc