On Wed, 18 Aug 2010 11:49:16 +0100, Leonidas Spyropoulos wrote:
Have you tried umounting and mounting before the second test to
eliminate any caching?
Yes, I have done it.
The result is similar to the one I have reported.
(Unit: second)
Create file performance
BtrFS Ext4
Total times: 2.484392 1.505082
Average: 0.000050 0.000030
Delete file performance
BtrFS Ext4
Total times: 3.369469 1.024886
Average: 0.000067 0.000020
Which kernel you use?
v2.6.35
Regards
Miao Xie
2010/8/18 Miao Xie<[email protected]>:
Hi,
We did some performance test and found the create/delete files performance
of btrfs is very poor.
The test is that we create 50000 files and measure the file-create time
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)
Create file performance
BtrFS Ext4
Total times: 2.462625 1.449550
Average: 0.000049 0.000029
Delete file performance
BtrFS Ext4
Total times: 3.312796 0.997946
Average: 0.000066 0.000020
The results were measured on a x86_64 server with 4 cores and 2 SAS disks.
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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