6/23/2023 0 Comments Make ram disk![]() The biggest everyday performance gains occur when you fully install a program on a RAM disk. That makes a RAM disk a wonderful tool for hastening operations in which your machine must read and write a lot of data, such as media encoding or editing large batches of photos. After you're done, to remove the ram device execute `rmmod brd`.RAM disk read/write speeds blow away the speeds of even top-of-the-line SSDs. You can make an image of it with `dd if=/dev/ram0 of=img.bin` After you `umount` it, you get a partitioned `/dev/ram0` block # Now you can mount ram0p1 and ram0p2 as you would with a usual block device and copy # 300M, and the other one takes all space that's left The following creates two GPT partitions: one of size # description you can see with `modinfo brd | grep parm`, ATM there's just three. # the following creates 1 device /dev/ram0 of size 600M. 6 tests overall), and it is easier to setup too. In my tests with vdbench, ram disk shows higher IOPS than tmpfs (33k IOPS vs 29k IOPS on my machine in three consecutive tests, i.e. This is an analog to Fox's answer, but ram disk is used instead of tmpfs. ![]() # mount loop0p1 and loop0p2 and copy whatever you want and unmount it ![]() # Create loop block device of it (-P makes kernel look for partitions) # Create mountpoint for tmpfsĭd if=/dev/zero of=/tmp/tmpfs/img.bin bs=1M seek=599 count=1 As a bonus, you have that image ready and can upload it straight away. That might be the easiest way to accomplish what you want. Or (though little hacky) you can use tmpfs, create image file and use that as loop device. There is no need to use one filesystem per brd device. You can partition it using sfdisk, use the partitions and then use dd to dump its contents to file. Use that device in place of your usb drive. Just use brd and create one brd device (ram0). ramdisk and the 'brd' kernel module, which, when loaded, creates a number of 'partitions':Īnd each of them can individually be formatted and used, but like I said - I want a plain block device in RAM which I would then split into two partitions of 10MB and 500MB myself, and from where I would be then able to dd an image to a file on my HDD.tmpfs and ramfs, which obviously don't suit me.I just researched this topic and seems like the only options are One that can be split into partitions just like a physical USB pendrive can. So what I need is a plain block device in RAM. This not only would eliminate the manual step of inserting the USB disk, but would also be faster. I am thinking instead of the actual USB disk we could use a block device in RAM. This can also be done, but one manual step will still remain: insert the USB pendrive. The obvious improvement is to create a script that would do this all automatically. the people then uncompress, flash their USB disks with.Compress it and send to the people who test this software.Copy the ready-made image from USB pendrive back to our HDD:ĭd if=/dev/sdx of=usb.img bs=1M count=520.Unpack pre-compiled RootFS to /dev/sdx2. ![]()
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