Re: [PATCH] resize2fs: radically reduce memory utilization by using rbtree bitmaps

On 7/25/14, 12:51 PM, Theodore Ts'o wrote:

When resizing an empty 21T file system to 28T, resize2fs was using
this much CPU time and memory:

216.98user 19.77system 4:02.92elapsed 97%CPU (0avgtext+0avgdata 4485664maxresident)k
8inputs+1068680outputs (0major+800745minor)pagefaults 0swaps

After this one-line change:

222.29user 0.49system 3:48.79elapsed 97%CPU (0avgtext+0avgdata 30080maxresident)k
8inputs+1068552outputs (0major+2497minor)pagefaults 0swaps

An extra 14 seconds (+6%) of elapsed time to reduce the memory
utilization from 4.2GB to 29MB seems like a fair trade.  :-)

especially when it actually looks like 14 *fewer* seconds (-6%) ?

-Eric