Hello,
I need some help to tunning my storage.
Very simple test at begin (perl script test.pl):
#!/usr/bin/perl
$time=time();
for ($i=1;$i<100;$i++)
{
open (SUBOR,">$i.txt");
print SUBOR "aaaaaaaaaaaaaaaaaaa\n";
close (SUBOR);
print "WRITE $i. FILE\n";
}
$time2=time();
$rozdiel_casov=$time2-$time;
print "TIME ".$rozdiel_casov." sekund\n";
First run:
file1:/mnt/hosting/test# ./test.pl
WRITE 1. FILE
WRITE 2. FILE
...
WRITE 98. FILE
WRITE 99. FILE
TIME 0 sekund
Every next run (rewrite existing files) is very very very slow:
file1:/mnt/hosting/test# ./test.pl
WRITE 1. FILE
WRITE 2. FILE
...
WRITE 98. FILE
WRITE 99. FILE
TIME 43 sekund
I try it on ext3. Every run is only 1-3seconds.
I tried tunning my storage.
My last mount specification:
(rw,noatime,nodiratime,nobarrier,osyncisosync,logbsize=256k,logbufs=8,quota)
I tried all possible configuration (barrier, nobarrier, osyncisosync,
logbssize=XX,logbufs=2-8) nothing help me.
file1:/mnt/hosting/test# xfs_info /mnt/hosting/
meta-data=/dev/mapper/vghosting-hosting isize=256 agcount=32,
agsize=7626752 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=244056064,
imaxpct=25
= sunit=0 swidth=0 blks, unwritten=1
naming =version 2 bsize=4096
log =internal bsize=4096 blocks=32768, version=2
= sectsz=512 sunit=0 blks
realtime =none extsz=65536 blocks=0, rtextents=0
I test it on 4 other xfs storages and results was similar.
Any ideas?
Thanks.
Dusan
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