Re: Poor creat/delete files performance

[Leonidas Spyropoulos <artafinde@gmail.com>]

Have you tried umounting and mounting before the second test to
eliminate any caching?
Which kernel you use?

2010/8/18 Miao Xie <miaox@cn.fujitsu.com>:
> Hi,
>
> We did some performance test and found the create/delete files perfor=
mance
> of btrfs is very poor.
>
> The test is that we create 50000 files and measure the file-create ti=
me
> first, and then delete these 50000 files and measure the file-delete =
time.
> (The attached file is the reproduce program)
>
> The result is following:
> (Unit: second)
> =A0Create file performance
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0BtrFS =A0 =A0 =A0 =A0 =A0 Ext4
> =A0Total times: =A02.462625 =A0 =A0 =A0 =A01.449550
> =A0Average: =A0 =A0 =A00.000049 =A0 =A0 =A0 =A00.000029
>
> =A0Delete file performance
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0BtrFS =A0 =A0 =A0 =A0 =A0 Ext4
> =A0Total times: =A03.312796 =A0 =A0 =A0 =A00.997946
> =A0Average: =A0 =A0 =A00.000066 =A0 =A0 =A0 =A00.000020
>
> The results were measured on a x86_64 server with 4 cores and 2 SAS d=
isks.
> By debuging, we found the btrfs spent a lot of time on searching and
> inserting/removing items in the ctree.
>
> Is anyone looking at this issue?
>
> Regards
> Miao Xie
>



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