Thanks for the tip.
※ 引述《LCL2 (新年快熱~)》之銘言：
: ※ 引述《ydaniel00 (Daniel)》之銘言：
: : Loading the covtype file takes anywhere from 5 to 10 minutes
: : on a P4 2.8G depending on CPU usage. However, the fact that
: : covtype matrix needs 1 GB of RAM may be a potential
: : problem.
: I recommend using gc() function before and after file loading to
: release some system memory from R.
: For covtype matrix, we have 55*581012 entries. Assume each
: entries takes 8 bytes (type=double), overall memory = 255645280 bytes
: = 243.8 Mb. With original loaded file size 86Mb, at least 330 Mb is
: necessary.
: In my experience, it's usually more, but about 400Mb is the upper
: bound for most evaluation times (Sometimes R may wierdly rush to 600Mb, but
: not often, don't know why, it should take time to understand its
: underlying.)
: I'm interesting about whether someone uses machine with less than
: 500 Mb(or even 256) mem for this job running, maybe the Hard Disk
: will dancing around all the time.