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by olavgg 91 days ago
I have tried multiple enterprise SSD's, for sync writes. Nothing comes close to Optane Dimm, even Optane NVMe is 10x slower than PDIMMS.

https://forums.servethehome.com/index.php?threads/so-i-teste...
1 comments
hedora 91 days ago
Yeah, but what percentage of the time was the CPU stuck blocked on the memory bus for the two workloads?

Also, how was it guaranteeing the page writes were atomic?

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olavgg 90 days ago
You are correct that writes are not guaranteed to be atomic. PostgreSQL has a feature to handle torn pages: full_page_writes = on, which is enabled by default. This means you do double write.

For RocksDB I believe torn pages are not a problem as SST files are immutable. But correct me if I am wrong.

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