Fio benchmark output "error=Too many open files

[yan li <01jay.ly@xxxxxxxxx>]

Hi fio users and developers,
    When I run fio benchmark, there are some error in the screen.
    Does someone meet the same circumstances ?
    Thanks, ^_^

#fio fio.cfg
......
fio: pid=29128, err=24/file:filesetup.c:529,
func=open(/mnt/rw1/rw1.168.2), error=Too many open files
fio: pid=29039, err=24/file:filesetup.c:529, func=open(/mnt/rw.79.2),
error=Too many open files
fio: pid=29040, err=24/file:filesetup.c:529, func=open(/mnt/rw.80.2),
error=Too many open files
fio: pid=29074, err=24/file:filesetup.c:529, func=open(/mnt/rw.114.2),
error=Too many open files
fio: pid=29026, err=24/file:filesetup.c:529, func=open(/mnt/rw.66.2),
error=Too many open files
......


OS:Scientific Linux release 6.0 (Carbon)  2.6.32-131.6.1.el6.x86_64 #1
SMP Tue Jul 12 17:14:50 CDT 2011 x86_64 x86_64 x86_64 GNU/Linux

# cat /etc/security/limits.conf
*       hard    nofile  20480

# fio -v
fio 1.57

# cat fio.cfg
[rw]
rw=randread
ioengine=libaio
size=32m
numjobs=128
nrfiles=8
bssplit=512/20:1k/20:2k/10:4k/40:8k/10
directory=/mnt
iodepth=256
zero_buffers
timeout=500
thread
[rw1]
rw=randread
ioengine=libaio
size=32m
numjobs=128
nrfiles=8
bssplit=512/20:1k/20:2k/10:4k/40:8k/10
directory=/mnt/rw1
iodepth=256
zero_buffers
timeout=500
thread
[rw2]
rw=randwrite
ioengine=libaio
size=32m
numjobs=128
nrfiles=8
bssplit=512/20:1k/20:2k/10:4k/40:8k/10
directory=/mnt/rw2
iodepth=256
zero_buffers
timeout=500
thread
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