3 ms·

here's a paper that will shatter some illusions: https://www.usenix.org/system/files/conference/fast13/fast13-final80.pdf https://www.usenix.org/system/files/co

• londons_explore 7y ago
  Considering how the hardware doesn't provide the serializability guarantees that it claims, why do we pay the high software performance and complexity hit to try to get the same? Lockfiles, O_SYNC, flush(), etc. all become unnecessary if we just assume that all data is at risk in case of improper poweroff. libeatmydata does this, and dramatically increases performance for some workloads.
  • blattimwind 7y ago
    I/O has always been a happy-path-only adventure in mainstream software and hardware. Attempting consistent I/O (kernel and hardware will try their best to thwart any attempt) etc. may help in some cases, but ultimately there are hardly any guarantees when it comes to power loss, and your data may be gone or corrupted no matter what you did.