As I'm sure you know, the amount of each nonce range processed doesn't matter.
ckolivas also solves the problem of not getting exact hash statistics by simply counting the number of nonces found - since of course on average, you'll find one valid 1diff nonce per full nonce range processed.
Although over a short time frame this isn't very accurate, if you are hashing in the 10s of GH/s (or more) this is still good enough.
Is that also why the avg hash rates usually don't seem to add up to the total? Different calc methods.ckolivas also solves the problem of not getting exact hash statistics by simply counting the number of nonces found - since of course on average, you'll find one valid 1diff nonce per full nonce range processed.
Although over a short time frame this isn't very accurate, if you are hashing in the 10s of GH/s (or more) this is still good enough.
http://i.imgur.com/aVgHFv6.png
...
ckolivas has considered the hashmeter the bane of his existence for a while but he recently updated it to be quite reliable.
Of course, the hash rate is dependent on how you supply the results back, so it depends on which driver you are using as the basis.
(and again there have been a LOT of changes in the drivers also recently - the AMU has sort of been a nightmare due to the problems that have shown up because of it, so there have been a lot of changes related to that)
However, there is another way that they will be different.
My hotplug code now sets a start time for each device rather than using the cgminer start time.
Thus the device average for a hotplugged device does read at the expected performance of the device rather than below it due to the initial amount of time it wasn't connected.
But the overall average is of course since cgminer started.
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That temp reading is right but it's not close to the ASIC mounted. On next board revision I'm going to place the thermistor in the center of a quad of 4 ASICs so it should get a closer approximation, and of course once I do some testing I'll add an offset adjustment. Yes, it's actually 34C at my work bench 
Well ... every other mining devices sux with regards to their temperature measurements, so if you can make it more accurate, you'll be ahead of everyone else 