Does R do its own swapping out to disk? I disabled Linux swapping and the system still gets stuck in Purgatory where there's little CPU activity but the disk goes like crazy. That's with R having almost the whole machine to itself and running a memory hungry compute only function. I've seen this behavior with other version numbers but I'm running R 2.0.0 under Fedora Core 3. The system is a laptop with 1 Gig. RAM. Thanks!
Thrashing?
3 messages · Rob Steele, Brian Ripley, Christian Schulz
On Sat, 13 Nov 2004, Rob Steele wrote:
Does R do its own swapping out to disk? I disabled Linux swapping and the
No.
system still gets stuck in Purgatory where there's little CPU activity but the disk goes like crazy. That's with R having almost the whole machine to itself and running a memory hungry compute only function. I've seen this behavior with other version numbers but I'm running R 2.0.0 under Fedora Core 3. The system is a laptop with 1 Gig. RAM.
I don't see it on machines with 1 or 2Gb of RAM and 3-10Gb of swap.
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
IMHO it's dependend on your data size and the functions you use. I'm getting same behaviour (suse9) when i use mysqlWriteTable and reshape with large datasets and a upgrade from 512MB to 1GB works much more better - but now i dream from 2GB-4GB. christian
Rob Steele wrote:
Does R do its own swapping out to disk? I disabled Linux swapping and the system still gets stuck in Purgatory where there's little CPU activity but the disk goes like crazy. That's with R having almost the whole machine to itself and running a memory hungry compute only function. I've seen this behavior with other version numbers but I'm running R 2.0.0 under Fedora Core 3. The system is a laptop with 1 Gig. RAM. Thanks!
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