Messages in this thread |  | | | Date | Wed, 21 Apr 2010 10:57:00 -0400 | | From | Phillip Susi <> | | Subject | Re: readahead on directories |
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On 4/20/2010 8:44 PM, Jamie Lokier wrote: > readahead() doesn't make much sense on a directory - the offset and > size aren't meaningful. > > But does plain opendir/readdir/closedir solve the problem?
No, since those are synchronous. I want to have readahead() queue up reading the entire directory in the background to avoid blocking, and get the queue filled with a bunch of requests that can be merged into larger segments before being dispatched to the hardware.
I don't actually care to have the contents of the directories returned, so readdir() does more than I need in that respect, and also it performs a blocking read of one disk block at a time, which is horribly slow with a cold cache.
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