Good I tried up to 4 gb and that was huge diff Remo
Il giorno 20 set 2017, alle ore 18:29, Eric Broch <[email protected]> ha scritto: 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: [email protected] >>> For additional commands, e-mail: [email protected] >> >> -- >> Eric Broch >> White Horse Technical Consulting (WHTC) >
