Re: large scale (audio) file I/O on OS X : help or insight requested
Re: large scale (audio) file I/O on OS X : help or insight requested
- Subject: Re: large scale (audio) file I/O on OS X : help or insight requested
- From: Hamilton Feltman <email@hidden>
- Date: Thu, 12 Mar 2015 16:32:53 -0700
>
> No, the dtrace output (from iosnoop and hfsnoop) shows a kernel process regularly doing 64kB I/O to a variety of unidentified files.
If they are waveform overview files that might explain the small sizes.
But if not, and they are contiguous reads the disk controller could put them into single reads, but they would appear as separate reads of 64KB in the trace. Either a custom file cache or the built-in readahead cache could be doing this. Just speculating, but it seems they might be using a custom cache without readahead, because of the propensity of readahead pages being ejected at the os’s whim.
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