vinum performance

[Greg 'groggy' Lehey]

On Tuesday,  1 April 2003 at  9:23:26 -0500, Jason Andresen wrote:
> Greg 'groggy' Lehey wrote:
>
>>>>> I get 4565 K/sec on modern ATA/133 HDDs.
>>>>>
>>>>> Reading is much better at 91908 K/sec at least.
>>>
>>> Well, I'm writing 200MB files most of the time, so the stripe size is
>>> not an issue.  I'm just wondering why the reads are *20* times faster
>>> than the writes.
>>
>>
>> They're not.  I don't know where you get that read figure from, but no
>> disk can transfer that fast, and you don't appear to be doing multiple
>> transfers in parallel.
>
> That was what bonnie++ reported.

As I've said elsewhere, bonnie++ is not an appropriate benchmark here.

>>> I think the read performance was CPU limited in this case.
>>
>>
>> I think you were reading from cache.
>
> Quite possible.  I'm not sure how bonnie handles that.

It reads from cache.

Greg
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