Not yet, I'll get around to it tomorrow; although, I did create a
ramdisk not using qmail and the i/o is below...ramdisk and regular disk:
# mount -t tmpfs -o size=1024m myramdisk /root/test
Tests:
<ramdisk>
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.137311 s, 298 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0830357 s, 493 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.127313 s, 322 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0831524 s, 493 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0971883 s, 421 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0582312 s, 703 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0823376 s, 497 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0476335 s, 860 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0958023 s, 428 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0577131 s, 710 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0953467 s, 430 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0550215 s, 744 MB/s
</ramdisk>
<disk>
[root@pet105 ~]# umount /root/test
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.173289 s, 236 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0778732 s, 526 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.445783 s, 91.9 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0888948 s, 461 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.300269 s, 136 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.077496 s, 529 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.651333 s, 62.9 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0792704 s, 517 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.336917 s, 122 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0509368 s, 804 MB/s
[root@pet105 ~]# dd if=/dev/zero of=/root/test/zero bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.300024 s, 137 MB/s
[root@pet105 ~]# sudo dd if=/root/test/zero of=/dev/null bs=4k count=10000
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 0.0865258 s, 473 MB/s
</disk>
On 9/20/2017 7:08 PM, Remo Mattei wrote:
Hi Eric,
did you try the config of the ramdisk? I was doing some testing and in
the small file it's not a big change but when you go up in size it
does make a diff.. I wonder if you configured it to use it with
qmail.. I notice that the tmfs is going to change the permissions so
not sure without checking out how the permissions will apply since now
the simscan folder has 4750 on it.
Ciao
On 9/19/17 8:42 AM, Eric Broch wrote:
Hi Rajesh,
It looks straight forward:
https://www.linuxbabe.com/command-line/create-ramdisk-linux
https://www.jamescoyle.net/how-to/943-create-a-ram-disk-in-linux
I've never done it, but may give it a try today or tomorrow.
Eric
On 9/19/2017 8:42 AM, Rajesh M wrote:
hi all,
has anyone tried putting the
/var/qmail/simscan folder on ramdisk
how do i do it incase of centos 6
i was checking out this page and found that it significantly increases
performance
https://qmail.jms1.net/simscan/
if anyone has done it could you please share the details of how to do it and
the performance improvement.
thanks
rajesh
---------------------------------------------------------------------
To unsubscribe, e-mail:qmailtoaster-list-unsubscr...@qmailtoaster.com
For additional commands, e-mail:qmailtoaster-list-h...@qmailtoaster.com
--
Eric Broch
White Horse Technical Consulting (WHTC)
