No it doesn't, in those 3 days your iPads hottest was 35.45C - below human body temp
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Easily see how hot your new iPad is getting from its log files
- Thread starter TrimmTrabb
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I was joking and I was referring to
<real>89504.631916979008</real> which is 161,139 F
As for date range my iPad appears to be generating logs daily and those temps were from the log on 4/11. I checked the other dates and those temps were lower overall.
As for Temp 1,3,5 I believe they are readings from every other core in the iPad. So CPU Core 2 is 1, GPU Core 2 is 3 and Core 4 is 5. This would be similar to how Intel does it except they can record temps from each core.
Interesting. Can you tell me a bit more about why you think those numbers are related to the SoC cores? When you say that's how Intel does it, can you point me to any documentation or info on that?
By the way, my iPad has only ever generated logs for 1 and 5. And this screenshot from someone on the Apple Discussion boards shows every single number from 1 to 6: https://discussions.apple.com/servlet/JiveServlet/showImage/2-17915468-100054/photo.PNG
Nice find, TrimmTrabb!
I currently use the SwitchEasy Canvas case on my iPad, and based on my values below (assuming TrimmTrabb's thoughts of their meaning is correct) it's not affecting heat dissipation much.
<key>com.apple.cltm.Temperature1</key>
<real>17.48</real>
<real>30.93</real>
<real>25.645226252158935</real>
<key>com.apple.cltm.Temperature5</key>
<real>18.370000000000001</real>
<real>30.780000000000001</real>
<real>26.03294300518138</real>
I currently use the SwitchEasy Canvas case on my iPad, and based on my values below (assuming TrimmTrabb's thoughts of their meaning is correct) it's not affecting heat dissipation much.
<key>com.apple.cltm.Temperature1</key>
<real>17.48</real>
<real>30.93</real>
<real>25.645226252158935</real>
<key>com.apple.cltm.Temperature5</key>
<real>18.370000000000001</real>
<real>30.780000000000001</real>
<real>26.03294300518138</real>
Not saying you're wrong at all, but some of these "measurements" are to 15 decimal places. That's a precision of a quadrillionth of a degree (or femto degrees celsius).
My assumption is that this value is stored and passed around as a real (double float) data type, and so we're exposed to its full length. Whatever conversion or recording process the temperature sensor goes through, it ends up in this format. I don't know enough about CPU sensors, but it could be the initial value is recorded in Kelvin, then converted.
Yeah, forget the Kelvin thing.
Instead, look at this guide for an embedded silicon temperature sensor from Freescale. The way that it works is not by giving out a temperature reading. It's up to the firmware to look at the voltage passing across this bit of silicon and then apply an algorithm to try and approximate a temperature out of it. You can see some of these methods involve complex formulas using float accuracy that would give you the significant digits you see in the iPad log file. It doesn't mean (in fact, it's highly unlikely) that the sensor is this accurate. It's just the firmware's calculation of the sensor data is done in floating point.
http://cache.freescale.com/files/microcontrollers/doc/app_note/AN3031.pdf
Pretty much any modern CPU can give you the temperature of each core. Be it AMD or Intel. Maybe the iPad has sensors to all of them since that post you show has all 6 cores on the iPad.
I checked all of my Logs and it seems to be only reporting 1, 3 and 5. I have never rebooted my iPad since I got it so I am doing that now to see if I get something different in tomorrows log.
It only make sense to be that
0 = CPU Core 1
1 = CPU Core 2
2 = GPU Core 1
3 = GPU Core 2
4 = GPU Core 3
5 = GPU Core 4
Then the top 3 real values are likely
Low
High
Average
Who knows what the last real value is. I got one for yesterdays log that is 91760......
A reboot did the trick. I now show 6 temperatures.
<key>com.apple.cltm.Temperature1</key>
<array>
<real>19.620000000000001</real>
<real>38.619999999999997</real>
<real>26.920987640697444</real>
<real>72805.845460615878</real>
<integer>9062</integer>
</array>
<key>com.apple.cltm.Temperature2</key>
<array>
<real>26.5</real>
<real>26.5</real>
<real>26.5</real>
<real>0.0</real>
<integer>1</integer>
</array>
<key>com.apple.cltm.Temperature3</key>
<array>
<real>18.859999999999999</real>
<real>36.289999999999999</real>
<real>25.427616420216307</real>
<real>52740.600914676601</real>
<integer>9062</integer>
</array>
<key>com.apple.cltm.Temperature4</key>
<array>
<real>25.109999999999999</real>
<real>25.109999999999999</real>
<real>25.109999999999999</real>
<real>0.0</real>
<integer>1</integer>
</array>
<key>com.apple.cltm.Temperature5</key>
<array>
<real>20.5</real>
<real>38.119999999999997</real>
<real>27.551721474288257</real>
<real>59691.753345001314</real>
<integer>9062</integer>
</array>
<key>com.apple.cltm.Temperature6</key>
<array>
<real>27.030000000000001</real>
<real>27.030000000000001</real>
<real>27.030000000000001</real>
<real>0.0</real>
<integer>1</integer>
<key>com.apple.cltm.Temperature1</key>
<array>
<real>19.620000000000001</real>
<real>38.619999999999997</real>
<real>26.920987640697444</real>
<real>72805.845460615878</real>
<integer>9062</integer>
</array>
<key>com.apple.cltm.Temperature2</key>
<array>
<real>26.5</real>
<real>26.5</real>
<real>26.5</real>
<real>0.0</real>
<integer>1</integer>
</array>
<key>com.apple.cltm.Temperature3</key>
<array>
<real>18.859999999999999</real>
<real>36.289999999999999</real>
<real>25.427616420216307</real>
<real>52740.600914676601</real>
<integer>9062</integer>
</array>
<key>com.apple.cltm.Temperature4</key>
<array>
<real>25.109999999999999</real>
<real>25.109999999999999</real>
<real>25.109999999999999</real>
<real>0.0</real>
<integer>1</integer>
</array>
<key>com.apple.cltm.Temperature5</key>
<array>
<real>20.5</real>
<real>38.119999999999997</real>
<real>27.551721474288257</real>
<real>59691.753345001314</real>
<integer>9062</integer>
</array>
<key>com.apple.cltm.Temperature6</key>
<array>
<real>27.030000000000001</real>
<real>27.030000000000001</real>
<real>27.030000000000001</real>
<real>0.0</real>
<integer>1</integer>
Except I can't quite explain the readings from the previously-missing sensors... it appears that only one temperature reading was recorded for each of them? Strange...
Likely because it was the day I rebooted it. Yesterdays log is better.
<key>com.apple.cltm.Temperature1</key>
<array>
<real>20.390000000000001</real>
<real>37.5</real>
<real>26.407618902748176</real>
<real>48204.224891836362</real>
<integer>9861</integer>
</array>
<key>com.apple.cltm.Temperature2</key>
<array>
<real>29.66</real>
<real>36.469999999999999</real>
<real>34.100916334661328</real>
<real>594.98268924303738</real>
<integer>251</integer>
</array>
<key>com.apple.cltm.Temperature3</key>
<array>
<real>19.620000000000001</real>
<real>34.969999999999999</real>
<real>25.102944934590784</real>
<real>38109.62087909894</real>
<integer>9861</integer>
</array>
<key>com.apple.cltm.Temperature4</key>
<array>
<real>28.609999999999999</real>
<real>34.369999999999997</real>
<real>32.346215139442208</real>
<real>399.95850438247368</real>
<integer>251</integer>
</array>
<key>com.apple.cltm.Temperature5</key>
<array>
<real>21.289999999999999</real>
<real>36.979999999999997</real>
<real>27.169235371666325</real>
<real>44658.893234703944</real>
<integer>9861</integer>
</array>
<key>com.apple.cltm.Temperature6</key>
<array>
<real>30.579999999999998</real>
<real>36.799999999999997</real>
<real>34.622071713147413</real>
<real>491.15592270916511</real>
<integer>251</integer>
</array>
Damn my readings are much higher than anyone else here:
<key>com.apple.cltm.Temperature1</key>
<array>
<real>25.010000000000002</real>
<real>43.549999999999997</real>
<real>31.129682156793145</real>
<real>300189.49937606812</real>
<integer>14095</integer>
</array>
<key>com.apple.cltm.Temperature2</key>
<array>
<real>32.960000000000001</real>
<real>36.039999999999999</real>
<real>34.953855421686733</real>
<real>109.86153253012355</real>
<integer>166</integer>
</array>
<key>com.apple.cltm.Temperature5</key>
<array>
<real>26.800000000000001</real>
<real>44.090000000000003</real>
<real>32.619360766229143</real>
<real>257431.00174050324</real>
<integer>14095</integer>
</array>
<key>com.apple.cltm.Temperature6</key>
<array>
<real>34.140000000000001</real>
<real>37.079999999999998</real>
<real>36.016807228915646</real>
<real>105.12200783132818</real>
<integer>166</integer>
<key>com.apple.cltm.Temperature1</key>
<array>
<real>25.010000000000002</real>
<real>43.549999999999997</real>
<real>31.129682156793145</real>
<real>300189.49937606812</real>
<integer>14095</integer>
</array>
<key>com.apple.cltm.Temperature2</key>
<array>
<real>32.960000000000001</real>
<real>36.039999999999999</real>
<real>34.953855421686733</real>
<real>109.86153253012355</real>
<integer>166</integer>
</array>
<key>com.apple.cltm.Temperature5</key>
<array>
<real>26.800000000000001</real>
<real>44.090000000000003</real>
<real>32.619360766229143</real>
<real>257431.00174050324</real>
<integer>14095</integer>
</array>
<key>com.apple.cltm.Temperature6</key>
<array>
<real>34.140000000000001</real>
<real>37.079999999999998</real>
<real>36.016807228915646</real>
<real>105.12200783132818</real>
<integer>166</integer>
Does it seem strange that 2,4, and 6 are exactly the same temps? It seems like that there would have to be some variation in temp even if it's just from fluctuations of the environmental conditions that the iPad is exposed to over that length of time.
<key>com.apple.cltm.Temperature1</key>
<array>
<real>20.960000000000001</real>
<real>34.960000000000001</real>
<real>22.756323283081944</real>
<real>64675.679469765797</real>
<integer>15522</integer>
</array>
<key>com.apple.cltm.Temperature2</key>
<array>
<real>23.719999999999999</real>
<real>23.719999999999999</real>
<real>23.719999999999999</real>
<real>0.0</real>
<integer>1</integer>
</array>
<key>com.apple.cltm.Temperature3</key>
<array>
<real>19.98</real>
<real>33.780000000000001</real>
<real>21.607221363226383</real>
<real>49697.312457394386</real>
<integer>15522</integer>
</array>
<key>com.apple.cltm.Temperature4</key>
<array>
<real>21.850000000000001</real>
<real>21.850000000000001</real>
<real>21.850000000000001</real>
<real>0.0</real>
<integer>1</integer>
</array>
<key>com.apple.cltm.Temperature5</key>
<array>
<real>22.059999999999999</real>
<real>35.340000000000003</real>
<real>23.855478031181434</real>
<real>63652.862703008621</real>
<integer>15522</integer>
</array>
<key>com.apple.cltm.Temperature6</key>
<array>
<real>24.510000000000002</real>
<real>24.510000000000002</real>
<real>24.510000000000002</real>
<key>com.apple.cltm.Temperature1</key>
<array>
<real>20.960000000000001</real>
<real>34.960000000000001</real>
<real>22.756323283081944</real>
<real>64675.679469765797</real>
<integer>15522</integer>
</array>
<key>com.apple.cltm.Temperature2</key>
<array>
<real>23.719999999999999</real>
<real>23.719999999999999</real>
<real>23.719999999999999</real>
<real>0.0</real>
<integer>1</integer>
</array>
<key>com.apple.cltm.Temperature3</key>
<array>
<real>19.98</real>
<real>33.780000000000001</real>
<real>21.607221363226383</real>
<real>49697.312457394386</real>
<integer>15522</integer>
</array>
<key>com.apple.cltm.Temperature4</key>
<array>
<real>21.850000000000001</real>
<real>21.850000000000001</real>
<real>21.850000000000001</real>
<real>0.0</real>
<integer>1</integer>
</array>
<key>com.apple.cltm.Temperature5</key>
<array>
<real>22.059999999999999</real>
<real>35.340000000000003</real>
<real>23.855478031181434</real>
<real>63652.862703008621</real>
<integer>15522</integer>
</array>
<key>com.apple.cltm.Temperature6</key>
<array>
<real>24.510000000000002</real>
<real>24.510000000000002</real>
<real>24.510000000000002</real>
That does seem a bit odd to me. I don't have an explanation (sorry), but I would assume just as you did that even sitting idle the iPad would change temperature even a little bit. That's really strange. But as long as your iPad functions properly, then it would be my unprofessional opinion that it's nothing to worry about.
It does function properly. I just purchased it a few weeks ago, so it hasn't had an excessive amount of use, but I also noticed something else that seems off. From what I understand based on an earlier post, once the device has been rebooted then it starts running diagnostics on all 6 cores. On mine, there are temperature readings for all 6 cores on the 15th & 16th of April, but the dates before and after that are only reporting temps for cores 1,3, & 5. Is that normal or abnormal ? I'm a complete novice when it comes to these things so I apologize if that's a stupid question or the answer is obvious.
All of the rules governing this logging are kind of a mystery. We're just trying to guess as best we can. Given that, I would absolutely not take any of this as a sign that something is abnormal with your iPad. It's just a bunch of diagnostic logs.
