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WrMeta

Subject: WrMeta
From: Dave Keck <email@hidden>
Date: Fri, 06 Jul 2012 11:22:50 -1000

Hey list,

I'm optimizing a program that reads image metadata using
CGImageSourceCreateWithURL(). This program should strictly read from
disk, but as it iterates over thousands of photos, the kernel is
writing data to disk at >1 MB/sec. fs_usage reports many instances of
the following:

    WrMeta[asyncP]  D=0x...  B=0x2000  /dev/disk...  0.097343  W  kernel_task

This is not the kernel paging-out to disk, as Activity Monitor reports
a constant value for "Page outs" for the lifetime of the program.

What is 'WrMeta'?
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