Messages in this thread | | | Date | Fri, 26 Jan 2007 11:58:43 -0500 | From | Phillip Susi <> | Subject | Re: O_DIRECT question |
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Mark Lord wrote: > You guys need to backup in this thread. > > Every example of O_DIRECT here could be replaced with > calls to mmap(), msync(), and madvise() (or posix_fadvise). > > In addition to being at least as fast as O_DIRECT, > these have the added benefit of using the page cache (avoiding reads for > data already present, handling multiple > users of the same data, etc..).
Please actually _read_ the thread. In every one of my posts I have shown why this is not the case.
To briefly rehash the core of the argument, there is no way to asynchronously manage IO with mmap, msync, madvise -- instead you take page faults or otherwise block, thus stalling the pipeline.
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