> If you clearly understand your access patterns and memory requirements, you ca... | Hacker News

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philsnow 75 days ago | parent | context | favorite | on: Disk I/O bottlenecks in GitHub Actions

> If you clearly understand your access patterns and memory requirements, you can often outperform the default OS page cache.

I believe various RDBMSs bypass the page cache and use their own strategies for managing caching if you give them access to raw block devices, right?

inkyoto 75 days ago [–]

That is true and correct, except that Linux does not have raw devices, and O_DIRECT on a file is not a complete replacement for the raw devices (the buffer cache still gets involved as well as the file system).

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