overall performance of the OS, filing systems and apps

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overall performance of the OS, filing systems and apps

Post by grahamperrin » Wed Sep 26, 2012 8:21 am

Partly in response to Slow reads and writes and Assertions..., I'm interested in overall performance.

Screenshots etc. at http://www.wuala.com/grahamperrin/publi ... de=gallery and http://www.wuala.com/grahamperrin/publi ... de=gallery – maybe more in due course.

Without going into detail: for most purposes I'm very pleased with the combination of ZEVO Community Edition 1.1 and OS X 10.8.2.

On 23rd September I noticed something unusual, pleasing: a drop in the percentage of memory that was wired. Shots from 21:43 and five minutes later, 21:48:

Image

Image

At a glance, it seems to me that memory usage of ZEVO is improved (compared to Ten's Complement releases and private betas) – consistent with the GreenBytes statement "… custom ZFS memory manager is finely tuned …".

On the other hand, I have recently abandoned compression=on for my home directory. I wonder whether that change to the dataset was partly contributory to the apparent change in wired memory behaviour. (I never found a problem with compression, I simply wanted to see whether usage feels different without it.)
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Re: overall performance of the OS, filing systems and apps

Post by si-ghan-bi » Wed Sep 26, 2012 9:19 am

ZEVO CE is still taking 2 GB wired in my system that has 6 GB total :(
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measuring ZEVO use of wired memory

Post by grahamperrin » Wed Sep 26, 2012 9:51 am

si-ghan-bi wrote:ZEVO CE is still taking … wired …


Forgive my ignorance … please, how best to measure that?

Is it as simple as reading the TOTAL column in zstat?
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Re: overall performance of the OS, filing systems and apps

Post by si-ghan-bi » Wed Nov 13, 2013 1:46 pm

Yes: if I unmount the zfs disk, the wired memory decreases exactly of that amount.


Last bumped by grahamperrin on Wed Nov 13, 2013 1:46 pm.
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