On 08/15/2012 09:32 AM, Gema Gomez wrote:
Hey Jeff,
On 15/08/12 14:07, Jeff Lane wrote:
Hey folks,
I wanted to ask a quick and dirty question:
What would you consider a "Stress" test of removable media like USB Keys
& SD/SDHC cards?
What are you trying to test exactly, the speed of the HW itself or the
throughput that you get from a particular driver/implementation? The
file-system on that media? The time it takes to wear off? What is it
that you are trying to stress?
That's a good question, and in reality, it's just a general "Lets do a
whole lot of stuff to this removable device at once and make sure it
doesn't fall over". Not looking to explore specific facets, more like
just general load testing. I think your ideas below address the spirit
of the exercise.
I'm working on enhancing a script and so far, the only idea put forth
was to do multiple simultaneous read/writes (like 100 at a time). But is
that a realistic stress test for something meant to be small, light but
with a very slow transfer speed?
It all depends on what you are trying to achieve. There are many
variables and there are file-system implementations that can interfere
with your measurements.
Or would it be more appropriate to do something more realistic like,
transfer increasingly large files up to a pre-determined size (perhaps a
2GB file size max?)
Maybe for an SD card more realistic would be to transfer 3-4 MB files,
but tons of them, like people do with cameras/music. Again back to my
question of what you are trying to stress.
Currently, I have something that does X concurrent threads that write
data to a device, checksum the data and compare that checksum to the
original file for verification. I think your suggestion is more inline
with real-world usage (e.g. the camera use, or transferring a library of
music, etc) and may be more valuable as this is really, as mentioned
above, a general load test, not necessarily stressing or looking at a
particular piece in the stack.
Thanks,
Gema
Cheers,
Jeff
--
Jeff Lane - Hardware Certification Engineer and Test Tools Developer
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