Messages in this thread | | | Subject | Re: [Ext2-devel] disk throughput | From | m@mo ... | Date | 06 Nov 2001 07:28:02 +1100 |
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Andreas Dilger <adilger@turbolabs.com> writes: > On Nov 05, 2001 00:04 -0800, Andrew Morton wrote: [..] > > With the ialloc.c change, plus the other changes I mentioned > > the time to create all these directories and files and then run > > /bin/sync fell from 1:53 to 0:28. Fourfold. > > In the end, though, while the old heuristic has a good theory, it _may_ > be that in practise, you are _always_ seeking to get data from different > groups, rather than _theoretically_ seeking because of fragmented files. > I don't know what the answer is - probably depends on finding "valid" > benchmarks (cough).
Another heuristic to try make be to only use a different blockgroup for when the mkdir()s are seperate in time. i.e. rather than doing if ( 0 && .. use something like if ((last_time + 100) < jiffes && ... last_time = jiffies; which would in theory use the old behaviour for sparodic mkdirs and the new behaviour for things like 'untar' et al.
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