Re: measurement of read/writes
Re: measurement of read/writes
- Subject: Re: measurement of read/writes
- From: Shantonu Sen <email@hidden>
- Date: Sun, 16 Sep 2012 10:17:18 -0700
The statistics are recorded by the block storage driver. For example, run "ioreg -c IOBlockStorageDriver -w0 | grep 'Statistics'"
Note that every file access will typically generate a metadata write to update access times. Running "fs_usage -f filesys" might be useful to track where/when the writes are being issued.
Shantonu
On Sep 16, 2012, at 3:33 AM, Patrick Proniewski <email@hidden> wrote:
> Hello,
>
> I'm not sure it's a filesystem question, feel free to point me to another mailing list.
>
> I'm running 10.6.8. When I use the command top(1), it displays the quantity of data read and written on disks since boot time. For example, now it displays "Disks: 4459946/83G read, 4763397/181G written." for a 5 days uptime (Mac Pro, 3 HDDs + 1 SSD, typical usage: mail/web, games, some photo editing…).
> I wonder how these stats are calculated, and if they can be trusted. "Written" is always bigger than "read", even on the macbook pro at work (sysadmin workload: mail/web/ssh/vmware).
>
> Any pointers?
>
> regards,
> Patrick _______________________________________________
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