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madMAx43v3r / chia-plotter

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How much SSD write when RAM disk is enabled #829

Closed niconiconi closed 1 year ago

niconiconi commented 3 years ago

so basically with this parameter: -t ssd_path -2 ramdisk_path -f ssd_path

Assuming ramdisk has 120GB space.

How much SSD write per plot?

Jacek-ghub commented 3 years ago

Crystal Disk Info gives you exact data about TBW to a given SSD. Just run it first, then run one plot, and go back to Crystal Disk Info.

niconiconi commented 3 years ago

Crystal Disk Info gives you exact data about TBW to a given SSD. Just run it first, then run one plot, and go back to Crystal Disk Info.

I have other applications run on that SSD, so it's not accurate.

wavepacket0 commented 3 years ago

assuming that a plot requires 1.3Tib (about 1.43TB) of written data and 75% of writes are on tmp2, I would assume that you save about 1.07TB of writes by using a ramdisk. However I cannot test since my ram is just 32G. By the way, even with less ram, you can use programs like PrimoCache to have a consistent benefit, for me it's around 26% of saved writes with 21G ram

RenarYnosX commented 3 years ago

assuming that a plot requires 1.3Tib (about 1.43TB) of written data and 75% of writes are on tmp2, I would assume that you save about 1.07TB of writes by using a ramdisk. However I cannot test since my ram is just 32G. By the way, even with less ram, you can use programs like PrimoCache to have a consistent benefit, for me it's around 26% of saved writes with 21G ram

Hardly believe that temp2 takes 75% writes. putting slow HDD on temp2 didnt expands plot time so much as for temp1 And why -t and -2 work opposite -t is temp2 and -2 is temp1!? Strange...

ChazyTheBest commented 3 years ago

@RenarYnosX Huh? What are you talking about?

  -t, --tmpdir arg     Temporary directory, needs ~220 GiB (default = $PWD)
  -2, --tmpdir2 arg    Temporary directory 2, needs ~110 GiB [RAM] (default = <tmpdir>)
mk01 commented 3 years ago

@niconiconi

with tmp/tmp2 split, tmp takes in total ~370G of io sent to storage device.