Re:LMDB: Intel Optane SSD Microbenchmark
by mehrdadn on Thursday November 08, 2018 @01:49AM
(#18404729)
I have zero ideas how any of these work underneath, but out of a wild guess, is there any chance that alignment (or similar) is the issue? e.g. maybe RocksDB tries to align its writes to some boundary in a way that's awful for Optane's technology?
[ Parent
| on HN ]
Re:LMDB: Intel Optane SSD Microbenchmark
by wtallis on Thursday November 08, 2018 @05:46AM
(#18405472)
Alignment sounds like a plausible factor, but in my testing I've found that the penalty for unaligned writes on the Optane P4800X is less than a factor of two.
Re:LMDB: Intel Optane SSD Microbenchmark
by hyc_symas on Thursday November 08, 2018 @02:13PM
(#18409004)
Hadn't really thought of that. I suppose we could have retried by making a single partition taking up the entire space, and letting fdisk take care of aligning the start of the partition. But I assumed that alignment wouldn't be an issue when using the unpartitioned block device.