FWIW: I'm mounting my OE drives with barrier=0 and ext4 without journal (commit=10000 cannot be used on ext4 without journal)
BTW: During last OE Happy Hours Khem mentioned using F2FS on NVMEs, anyone else already played with it? Not sure how different the effect is from the suggested sysctl setting, but for my work station I would use it only for build disks (as there are some more valuable data on other disks including my PREMIRROR and the backup of NVMEs without SSTATE and TMPDIRs), so I don't mind much loosing data from these NVMEs, but using the same on regular /home would be bad. On Fri, Sep 8, 2023 at 10:51 AM Mikko Rapeli <mikko.rap...@linaro.org> wrote: > Hi, > > One related improvement is to avoid IO to disk completely as long as RAM is > available. By default file systems like ext4 will start writing all buffers > in the background after few seconds which is wasted IO if memory is > available and > rm_work will anyway wipe the tmp to produce a target filesystem image tar > ball etc. > sysctl settings are: > > vm.dirty_background_bytes = 0 > vm.dirty_background_ratio = 90 > vm.dirty_expire_centisecs = 4320000 > vm.dirtytime_expire_seconds = 432000 > vm.dirty_bytes = 0 > vm.dirty_ratio = 60 > vm.dirty_writeback_centisecs = 0 > > > http://events17.linuxfoundation.org/sites/events/files/slides/elce-2016-mario-goulart-mikko-rapeli.pdf > > It the best case in-memory file systems like tmpfs will do but it's hard > to estimate > the disk usage and memory size beforehand. Overflowing to disk IO only if > RAM is > getting full scales better. > > It makes sense to monitor build system CPU, memory, disk and network usage > while builds are on > going. A lot of odd things will pop up, like IO bottlenecks (most CPUs > idle), suprising network > downloads. > > And deleting files is a heavy operation and if flushed to disk, it's > annoyingly slow > compared to wiping an entire partition and creating a new file system on > it. > > Cheers, > > -Mikko >
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