[clue-talk] Benefits of SSDs : was new processors

[David Ahern]

What do you get for each case with the following:

sync
time -p 'dd if=/dev/zero of=/tmp/foo bs=4k count=100000; sync'

David


On 01/04/2010 04:49 PM, chris fedde wrote:
> On my sata attached ssd boot disk I see sequential write rates of:
> 
> dd if=/dev/zero of=/tmp/foo bs=4k count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes (410 MB) copied, 4.76564 s, 85.9 MB/s
> 
> and read rates are:
> 
> dd of=/dev/null if=/tmp/foo bs=4k count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes (410 MB) copied, 4.57398 s, 89.6 MB/s
> 
> On my sata II based data disk I see write rates:
> 
> dd if=/dev/zero of=foo bs=4k count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes (410 MB) copied, 8.84794 s, 46.3 MB/s
> 
> and read rates:
> 
> dd of=/dev/null if=foo bs=4k count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes (410 MB) copied, 7.73974 s, 52.9 MB/s
> 
> So the ssd is almost twice as fast as the 7200rpm sata II
> Doing this test with count <= 10000 was much faster since the whole
> file could sit in io buffers.
> 
> 
> On Mon, Jan 4, 2010 at 2:46 PM, YES NOPE9 <yes at nope9.com> wrote:
>>>
>>> On Jan 4, 2010, at 12:13 PM, Nate Duehr wrote:
>>>
>>> Quick note: Sorry, top-posted because I'm on a webmail interface right
>>> now...
>>>
>>> The speed difference between disk and everything else
>>> (processor/RAM/video/etc) is being closed with SSD drives.  Still not
>>> "100% ready for prime time" yet, looking over some of the errata on the
>>> early drives, but... with a good brand name (meaning: Intel right now),
>>> I'd trust one.
>>>
>>> (Some of the others have had some lovely bugs in firmware.  Kinda makes
>>> sense, Intel's a chip manufacturer and the hard drive manufacturers are
>>> learning how to do that, in a way.)
>>>
>>> Having seen a couple of machines with SSD's in them doing various tasks,
>>> I can unequivocally state that the spinning hard disk platter for
>>> anything other than mass storage, is dead.  It just doesn't know it yet.
>>>
>>> My next personal laptop will have an SSD for the OS's and swap, for
>>> sure... and the data for whatever e-mail and PIM type client software
>>> I'm using will also go on it to speed those common applications up.
>>>
>>> It's too big of a performance increase to ignore, from what I've seen.
>>>
>>> --
>>>  Nate Duehr
>>>  nate at natetech.com
>>
>>
>> What kind of performance gains have you seen ?
>> If you provide anecdotal stories  that is fine .
>> What kind of data rates and latency do you get out of SSDs ?
>> Gus
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