jmore...@mint ~ $ ls -lash /dev/ram*
0 brw-rw---- 1 root disk 1, 0 2010-03-29 21:35 /dev/ram0
0 brw-rw---- 1 root disk 1, 1 2010-03-29 21:35 /dev/ram1
0 brw-rw---- 1 root disk 1, 10 2010-03-29 21:35 /dev/ram10
0 brw-rw---- 1 root disk 1, 11 2010-03-29 21:35 /dev/ram11
0 brw-rw---- 1 root disk 1, 12 2010-03-29 21:35 /dev/ram12
0 brw-rw---- 1 root disk 1, 13 2010-03-29 21:35 /dev/ram13
0 brw-rw---- 1 root disk 1, 14 2010-03-29 21:35 /dev/ram14
0 brw-rw---- 1 root disk 1, 15 2010-03-29 21:35 /dev/ram15
0 brw-rw---- 1 root disk 1, 2 2010-03-29 21:35 /dev/ram2
0 brw-rw---- 1 root disk 1, 3 2010-03-29 21:35 /dev/ram3
0 brw-rw---- 1 root disk 1, 4 2010-03-29 21:35 /dev/ram4
0 brw-rw---- 1 root disk 1, 5 2010-03-29 21:35 /dev/ram5
0 brw-rw---- 1 root disk 1, 6 2010-03-29 21:35 /dev/ram6
0 brw-rw---- 1 root disk 1, 7 2010-03-29 21:35 /dev/ram7
0 brw-rw---- 1 root disk 1, 8 2010-03-29 21:35 /dev/ram8
0 brw-rw---- 1 root disk 1, 9 2010-03-29 21:35 /dev/ram9
jmore...@mint ~ $ sudo mkfs.reiserfs /dev/ram0
[sudo] password for jmoreira:
mkfs.reiserfs 3.6.21 (2009 www.namesys.com)
<...>
UUID: 700cb4ff-3607-4173-a2d0-12567b00dd6c
ATTENTION: YOU SHOULD REBOOT AFTER FDISK!
ALL DATA WILL BE LOST ON '/dev/ram0'!
Continue (y/n):y
Initializing journal - 0%....20%....40%....60%....80%....100%
Syncing..ok
ReiserFS is successfully created on /dev/ram0.
jmore...@mint ~ $ sudo mount /dev/ram0 /tmp/ramfs/
jmore...@mint ~ $ sudo chmod 777 /tmp/ramfs/
jmore...@mint ~ $ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda4 18G 7.6G 9.0G 46% /
udev 1.3G 324K 1.3G 1% /dev
none 1.3G 1.5M 1.3G 1% /dev/shm
none 1.3G 108K 1.3G 1% /var/run
none 1.3G 0 1.3G 0% /var/lock
none 1.3G 0 1.3G 0% /lib/init/rw
none 18G 7.6G 9.0G 46% /var/lib/ureadahead/debugfs
/dev/sda3 40G 23G 17G 58% /media/206E1A2F3EB61462
/dev/ram0 64M 33M 32M 51% /tmp/ramfs
AFAIK you need to do this everytime you boot or setup a script to do
it (since it's a volatile memory disk)
2010/3/29 Niklasro(.appspot) <[email protected]>:
> On Mar 28, 11:46 pm, José Moreira <[email protected]> wrote:
>> Setup something likehttp://ubuntuforums.org/showthread.php?t=182764
>> and set your datastore path on to the ramdisk with :
>>
>> --datastore_path=PATH Path to use for storing Datastore file stub
>> data. (Default /tmp/dev_appserver.datastore)
>>
>> *** speed tests ***
>>
>> Regular disk:
>>
>> jmore...@mint ~/Tmp $ sudo hdparm -Tt /dev/sda4
>> /dev/sda4:
>> Timing cached reads: 3576 MB in 2.00 seconds = 1791.11 MB/sec
>> Timing buffered disk reads: 112 MB in 3.01 seconds = 37.23 MB/sec
>>
>> Ram disk disk:
>>
>> jmore...@mint ~/Tmp $ sudo hdparm -Tt /dev/ram0
>> /dev/ram0:
>> Timing cached reads: 4114 MB in 2.00 seconds = 2061.44 MB/sec
>> Timing buffered disk reads: 64 MB in 0.14 seconds = 446.65 MB/sec
> I don't have a harddrive doing something similar:
> df -h
> Filesystem Size Used Avail Use% Mounted on
> aufs 2.0G 451M 1.5G 24% /
> udev 2.0G 236K 2.0G 1% /dev
> /dev/sr0 691M 691M 0 100% /cdrom
> /dev/loop0 666M 666M 0 100% /rofs
> none 2.0G 136K 2.0G 1% /dev/shm
> tmpfs 2.0G 20K 2.0G 1% /tmp
> none 2.0G 88K 2.0G 1% /var/run
> none 2.0G 0 2.0G 0% /var/lock
> none 2.0G 0 2.0G 0% /lib/init/rw
>
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