[Gluster-users] Performance problems

[Olivier Le Cam]

Bonjour Aurélien,

Aurelien ROUGEMONT wrote:
> root at test4:/var/www# dd if=/dev/zero of=./test count=10000 bs=1024
> 10000+0 records in
> 10000+0 records out
> 10240000 bytes (10 MB) copied, 17.8632 s, 573 kB/s

I have posted the exact same results just a few days ago (using the sid 
package backported to lenny):
http://gluster.org/pipermail/gluster-users/2010-March/004240.html

BTW, this seems to be related to the block size. Performances might be 
very different with different block sizes:

gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=2000
10000+0 enregistrements lus
10000+0 enregistrements écrits
20000000 bytes (20 MB) copied, 3,25723 s, 6,1 MB/s

gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=10000
10000+0 enregistrements lus
10000+0 enregistrements écrits
100000000 bytes (100 MB) copied, 3,30255 s, 30,3 MB/s

gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=40000
10000+0 enregistrements lus
10000+0 enregistrements écrits
400000000 bytes (400 MB) copied, 5,97635 s, 66,9 MB/s

gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=80000
10000+0 enregistrements lus
10000+0 enregistrements écrits
800000000 bytes (800 MB) copied, 9,12432 s, 87,7 MB/s

gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=160000
10000+0 enregistrements lus
10000+0 enregistrements écrits
1600000000 bytes (1,6 GB) copied, 15,0147 s, 107 MB/s

gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=320000
10000+0 enregistrements lus
10000+0 enregistrements écrits
3200000000 bytes (3,2 GB) copied, 28,8645 s, 111 MB/s

TBH, I don't know what to conclude from these results.

Regards,
-- 
Olivier