Re: Very slow transfers to/from micro SD card on a RPi B+

[mlelstv%serpens.de@localhost (Michael van Elst)]

stephanwib%googlemail.com@localhost (Stephan) writes:

>This is from an amd64 server box with an aac raid controller.

>/root/test/files> time seq 1 10000|xargs touch
>    3.10s real     0.01s user     3.07s system
>/root/test/files> rm *
>/root/test/files> time seq 1 20000|xargs touch
>    9.88s real     0.01s user     8.51s system
>/root/test/files> rm *
>/root/test/files> time seq 1 30000|xargs touch
>   23.45s real     0.04s user    20.41s system
>/root/test/files> time seq 1 40000|xargs touch
>   43.35s real     0.05s user    38.32s system

>That is clearly not linear.

Each lookup is linear (unless you use DIRHASH), so the total
time goes with n^2.

-- 
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."