JFFS2, UBIFS, and the growth of flash storage
Posted Dec 12, 2012 1:18 UTC (Wed) by neilbrown
In reply to: JFFS2, UBIFS, and the growth of flash storage
Parent article: JFFS2, UBIFS, and the growth of flash storage
Thanks for the suggestion. I hadn't used the active_logs mount option. I just ran my script with that option added and it didn't make much difference.
The numbers I get for the original and the active_logs=4 runs are:
write kernel 113.738 121.853 118.412
read kernel 150.369 270.465 175.724
du -s kernel 48.393 48.908 48.6091
rm -r kernel 0.333 0.384 0.36
write files 837.503
read files 571.196
write kernel 111.966 120.791 116.571
read kernel 148.364 238.796 163.316
du -s kernel 48.111 49.623 49.1534
rm -r kernel 0.335 0.365 0.3489
write files 1190.29
read files 563.56
Where there are 3 numbers they are min/max/mean of 10 runs.
Reading small files seems faster, but the numbers were already noisy - about half the individual results were within 5 seconds of the minimum. which is much the same in both cases.
The write-large-files test is quite a bit slower. I probably need to do a couple more runs before I know what that means.
So it looks like I wasn't hitting the possible too-many-erase-blocks-open case in this test.
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