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macbook pro 2016 throttles early

I have a 13 in macbook pro that throttles while still cool. Using Intel Power Gadget, it drops from 3.4Ghz to 1.8Ghz within a minute, even before the temperature is up to 65C. It is a threaded app that shows 350% cpu for the task so it isn't I/O bound.  If I run 4 separate cpu tasks, the machine warms up to 90C+ as expected with minimal throttling.  If I take the same problem program (binary even) and run it on my 2012 MacBook pro, it runs as expected with little throttling until over 100C.  What else is causing my mac to throttle before it hits warm temperatures?

Hi,

I'm not sure if this will help or not (it won't hurt), but try resetting the SMC: https://support.apple.com/en-us/HT201295.

Thought I had done that, but I did it again to make sure.  Didn't help. Only had xterm and Intel Power Gadget running. Started off at 3.4Ghz and throttled within 20 seconds, temperature was below 60C.  Top command shows 350% to 400% cpu, but at 1.8Ghz I am running almost half the speed I should.

Almost sounds like it could be a hardware issue, perhaps a sensor. Run Apple Hardware Diagnostics and see if it catches anyting: https://support.apple.com/en-us/HT201257

Updated the os to the one that came out yesterday (5/15/17), didn't help.  Latest thing I attempted, started the program up again, it throttled down to 1.8Ghz with the temperature less than 60C. Started a separate task that is single threaded pure compute. Still throttled to 1.8Ghz range. Killed the threaded task and the speed instantly jumps to 3.3-3.4Ghz. Restarted threaded task and it drops back to 1.8Ghz. Temperature never over 60C and fans are dead quiet.

markatlnk1 wrote:

 

Latest thing I attempted, started the program up again, it throttled down to 1.8Ghz with the temperature less than 60C. Started a separate task that is single threaded pure compute. Still throttled to 1.8Ghz range. Killed the threaded task and the speed instantly jumps to 3.3-3.4Ghz. Restarted threaded task and it drops back to 1.8Ghz.

Curious, what "program" and "task?"

What temperature monitoring programme are you using? And which sensor do you read your temperatures from?

The program processes data from a DNA sequencer. There are two input data files that are about 8 gigabytes each and contain about 14.4 million reads. Another file contains sequences that will be compared against all 14.4 million reads. With each read being processed independently, I set it up to use p-threads where one thread reads the records and passes those on to n threads for the compute intensive parts. When each processing thread is done, its results are passed back. Lots of structures, linked lists, and the usual stuff. It is all in C compiled with gcc. It is a bit less than 4,000 lines of code.

I am using Intel Power Gadget and I do believe that it is working ok. If I run 4 cpu intensive tasks, the temperature does increase to 90C+ and the fans do come up to speed.  When my program runs, it stays cool, fans are very quiet.  Same program on 2012 macBook pro quad core runs as expected. It gets warm (105C) fans get up to full speed.

Ok, thanks.

I use HWmonitor, this gives readings from everything from CPU package and individual cores to intake temperature and Ram temperatures including power draw and fan speeds. It showed me that when my CPU package is at 65 degrees individual cores can reach well over 85 degrees when under load (I know from desktop CPUs that the thermal paste under the IHS or internal heat sink can dry our and cause individual cores to heat up excessively forcing thermal throttle).

Alternatively, What happens when you force the fans to spin up to maximum speed while running your DNA sequencer program. Does the CPU still throttle then? You can do this using SMC fan control as a test.

I will try the HWmonitor.   I did force the fans up to full and that didn't help.

I know that this is a pretty old discussion thread. However, I think I know what is happening here. And it is nothing to be worried about.

In the image I posted, you can see that my clock speed is under the 2.3 GHz that my 13" 2017 MacBook Pro is supposed to have. This first image was taken while just having two Google Chrome tabs open.

This is when I am doing nothing intensive on my computer and the temperatures are fairly cool. However, when I start doing something more intensive, such as watching a 4k video on YouTube, you can see in the second picture that although my temperatures rise, the clock speed does as well. Which leads me to believe that the computer doesn't always run the CPU at the advertised clock speed to save power. The second picture was taken one minute into watching a 4k video.

So I think what you can take out of this, is that the computer won't start utilizing higher clock speeds until they are necessary, in which case there is nothing to be worried about.

最後更新：2017-09-12 08:30:51

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