I've just setup a raspberry pi 3 and found out that, on idle, the temperature is about 48 C (measured with vcgencmd measure_temp). On a raspberry pi B+ with the same enclosure and in the same environment I measured 37 C. Is this normal? The ambient temperature is about 22.5 C. Thanks
Case: https://www.amazon.com/dp/B00UW2G1BS
Power supply (for both): https://www.amazon.com/dp/B00VH8ZW02
I have eight pi3s in a room which is 22-24°C. They range in temperature between ~45°C and ~50°C when idle, with each pi being fairly consistent in temperature +-2°C (sorry, not terribly accurate values, they are from squinting at a plot). Mine aren't in any kind of enclosure, but are mounted on the underside of a plate with reasonably free air flow.
So your reading of 48°C is within what I see for the pi 3.
There's some info on power usage between the models here: Raspberry Pi 3 vs Pi 2 power consumption and heat dissipation
Your case looks to allow for a heat sink on the processor, no idea if it would make a difference if the limiting factor is heat leaving the case?
I have a RPI3 with a mini heatsink, like the following image:
Both heat sinks (14x14x11 mm and 9x9x12 mm) are made of aluminium and the fan is a SEPA MF15B-05 (15x15x5mm, 5V-0.06A) that is soldered to the printed circuit board (so it is permanent :P)
So the iddle temperature with Raspbian Lite, WIFI connection and SSH active connection is about ~37°C in a 25°C environment (measured with 2 different DHT11), as the image:
Here are the results for sysbench (The temp (vcgencmd measure_temp) commands were executed immediately after sysbench):
pi@raspberrypi:~ $ temp
19/02/2017 01:34 temp=38.1'C
pi@raspberrypi:~ $ sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=20000 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing CPU performance benchmark.
Threads started!
Done.
Maximum prime number checked in CPU test: 20000
Test execution summary:
total time: 120.2905s
total number of events: 10000
total time taken by event execution: 481.0520
per-request statistics:
min: 47.69ms
avg: 48.11ms
max: 107.84ms
approx. 95 percentile: 48.15ms
Threads fairness:
events (avg/stddev): 2500.0000/4.30
execution time (avg/stddev): 120.2630/0.01
pi@raspberrypi:~ $ temp
19/02/2017 01:37 temp=41.3'C
pi@raspberrypi:~ $ sudo sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=20000 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing CPU performance benchmark
Threads started!
Done.
Maximum prime number checked in CPU test: 20000
Test execution summary:
total time: 120.2604s
total number of events: 10000
total time taken by event execution: 480.9000
per-request statistics:
min: 47.69ms
avg: 48.09ms
max: 79.81ms
approx. 95 percentile: 48.19ms
Threads fairness:
events (avg/stddev): 2500.0000/4.64
execution time (avg/stddev): 120.2250/0.02
pi@raspberrypi:~ $ temp
19/02/2017 01:40 temp=51.5'C
pi@raspberrypi:~ $ sudo sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=50000 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing CPU performance benchmark
Threads started!
WARNING: Operation time (18446744073295001600.000000) is greater than maximal counted value, counting as 10000000000000.000000
WARNING: Percentile statistics will be inaccurate
Done.
Maximum prime number checked in CPU test: 50000
Test execution summary:
total time: 431.3375s
total number of events: 10000
total time taken by event execution: 1725.1204
per-request statistics:
min: 171.26ms
avg: 172.51ms
max: 18446744073297.48ms
approx. 95 percentile: 182.42ms
Threads fairness:
events (avg/stddev): 2500.0000/4.64
execution time (avg/stddev): 431.2801/0.06
pi@raspberrypi:~ $ temp
19/02/2017 01:47 temp=52.1'C
pi@raspberrypi:~ $ temp
19/02/2017 01:50 temp=38.6'C
pi@raspberrypi:~ $ temp
19/02/2017 01:58 temp=37.6'C
pi@raspberrypi:~ $ sudo sysbench --num-threads=4 --validate=on --test=threads --thread-yields=4000 --thread-locks=6 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing thread subsystem performance test
Thread yields per test: 4000 Locks used: 6
Threads started!
Done.
Test execution summary:
total time: 11.8955s
total number of events: 10000
total time taken by event execution: 47.5581
per-request statistics:
min: 4.58ms
avg: 4.76ms
max: 38.03ms
approx. 95 percentile: 4.78ms
Threads fairness:
events (avg/stddev): 2500.0000/7.87
execution time (avg/stddev): 11.8895/0.00
pi@raspberrypi:~ $ temp
19/02/2017 01:59 temp=41.9'C
pi@raspberrypi:~ $ sudo sysbench --num-threads=4 --validate=on --test=threads --thread-yields=40000 --thread-locks=6 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing thread subsystem performance test
Thread yields per test: 40000 Locks used: 6
Threads started!
Done.
Test execution summary:
total time: 118.2965s
total number of events: 10000
total time taken by event execution: 473.0799
per-request statistics:
min: 45.83ms
avg: 47.31ms
max: 289.45ms
approx. 95 percentile: 47.96ms
Threads fairness:
events (avg/stddev): 2500.0000/3.24
execution time (avg/stddev): 118.2700/0.01
pi@raspberrypi:~ $ temp
19/02/2017 02:01 temp=52.6'C
pi@raspberrypi:~ $ temp
19/02/2017 02:01 temp=45.1'C
pi@raspberrypi:~ $ temp
19/02/2017 02:02 temp=41.3'C
pi@raspberrypi:~ $ temp
19/02/2017 02:02 temp=40.8'C
pi@raspberrypi:~ $ temp
19/02/2017 02:03 temp=39.7'C
If I remove the fan and the heatsink, the normal temperature is between 45°C and 47°C, with the same clean Raspbian lite installation (default background processes) and a environment temperature of 25°C in a room with quiet air flow.
pi@raspberrypi:~ $ temp
19-02-2017 16:30:56.962 temp=44.5'C
19-02-2017 16:31:19.031 temp=44.5'C
19-02-2017 16:46:13.289 temp=47.2'C
19-02-2017 16:47:22.807 temp=46.2'C
19-02-2017 16:30:56.962 temp=44.5'C
19-02-2017 16:31:19.031 temp=44.5'C
19-02-2017 16:46:13.289 temp=47.2'C
19-02-2017 16:47:22.807 temp=46.2'C
pi@raspberrypi:~ $ sudo sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=20000 run &
[1] 6315
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing CPU performance benchmark
Threads started!
pi@raspberrypi:~ $ temp
19-02-2017 16:49:34.027 temp=62.3'C
19-02-2017 16:49:39.227 temp=65.0'C
19-02-2017 16:49:51.345 temp=68.2'C
19-02-2017 16:50:05.845 temp=70.9'C
19-02-2017 16:50:16.557 temp=72.0'C
19-02-2017 16:50:29.352 temp=74.1'C
19-02-2017 16:50:44.018 temp=75.2'C
19-02-2017 16:51:01.537 temp=76.3'C
19-02-2017 16:51:12.767 temp=77.4'C
Done.
Maximum prime number checked in CPU test: 20000
Test execution summary:
total time: 120.3647s
total number of events: 10000
total time taken by event execution: 481.3170
per-request statistics:
min: 47.69ms
avg: 48.13ms
max: 107.91ms
approx. 95 percentile: 48.45ms
Threads fairness:
events (avg/stddev): 2500.0000/5.61
execution time (avg/stddev): 120.3292/0.02
19-02-2017 16:51:25.627 temp=70.9'C
[1]+ Hecho sudo sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=20000 run
pi@raspberrypi:~ $ temp
19-02-2017 16:51:33.184 temp=63.4'C
19-02-2017 16:51:43.481 temp=59.1'C
19-02-2017 16:51:51.171 temp=58.0'C
19-02-2017 16:51:58.799 temp=56.9'C
19-02-2017 16:52:13.516 temp=54.8'C
19-02-2017 16:52:37.527 temp=53.7'C
pi@raspberrypi:~ $ sudo sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=20000 run &
[1] 9002
pi@raspberrypi:~ $ sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing CPU performance benchmark
Threads started!
pi@raspberrypi:~ $ temp
19-02-2017 16:52:44.986 temp=59.6'C
19-02-2017 16:52:50.375 temp=66.1'C
19-02-2017 16:52:57.017 temp=69.8'C
19-02-2017 16:53:08.557 temp=73.1'C
19-02-2017 16:53:17.467 temp=75.2'C
19-02-2017 16:53:28.827 temp=75.2'C
19-02-2017 16:53:42.841 temp=77.4'C
19-02-2017 16:54:03.827 temp=79.5'C
19-02-2017 16:54:09.247 temp=79.5'C
19-02-2017 16:54:15.461 temp=79.0'C
19-02-2017 16:54:25.284 temp=80.1'C
19-02-2017 16:54:33.565 temp=80.1'C
pi@raspberrypi:~ $ Done.
Maximum prime number checked in CPU test: 20000
Test execution summary:
total time: 120.7209s
total number of events: 10000
total time taken by event execution: 482.8149
per-request statistics:
min: 47.69ms
avg: 48.28ms
max: 74.52ms
approx. 95 percentile: 49.77ms
Threads fairness:
events (avg/stddev): 2500.0000/5.52
execution time (avg/stddev): 120.7037/0.01
pi@raspberrypi:~ $ temp
19-02-2017 16:54:45.399 temp=76.3'C
[1]+ Hecho sudo sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=20000 run
19-02-2017 16:54:47.936 temp=72.0'C
19-02-2017 16:54:48.756 temp=71.4'C
19-02-2017 16:54:49.725 temp=69.8'C
19-02-2017 16:54:50.609 temp=68.8'C
19-02-2017 16:54:51.662 temp=68.2'C
19-02-2017 16:54:54.030 temp=65.5'C
19-02-2017 16:54:59.340 temp=63.4'C
19-02-2017 16:55:04.280 temp=62.3'C
19-02-2017 16:55:08.219 temp=61.2'C
19-02-2017 16:55:11.744 temp=60.1'C
19-02-2017 16:55:15.914 temp=59.1'C
19-02-2017 16:55:19.300 temp=59.1'C
19-02-2017 16:55:23.306 temp=58.0'C
19-02-2017 16:55:27.411 temp=57.5'C
19-02-2017 16:55:33.266 temp=56.9'C
19-02-2017 16:56:15.095 temp=55.3'C
19-02-2017 16:57:03.016 temp=52.1'C
pi@raspberrypi:~ $ sudo sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=50000 run &
[1] 12616
pi@raspberrypi:~ $ sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing CPU performance benchmark
Threads started!
pi@raspberrypi:~ $ temp
19-02-2017 16:57:22.717 temp=67.1'C
19-02-2017 16:57:25.064 temp=68.8'C
19-02-2017 16:57:46.095 temp=74.7'C
19-02-2017 16:57:55.097 temp=75.2'C
19-02-2017 16:58:06.956 temp=76.8'C
19-02-2017 16:58:13.016 temp=77.4'C
19-02-2017 16:58:25.937 temp=78.4'C
19-02-2017 16:58:35.897 temp=79.5'C
19-02-2017 16:58:51.417 temp=80.6'C
19-02-2017 16:59:32.226 temp=81.7'C
19-02-2017 16:59:49.787 temp=80.6'C
19-02-2017 17:00:31.352 temp=81.1'C
19-02-2017 17:00:42.532 temp=81.7'C
19-02-2017 17:02:46.227 temp=81.7'C
19-02-2017 17:03:22.253 temp=82.2'C
19-02-2017 17:04:37.505 temp=81.7'C
pi@raspberrypi:~ $ Done.
Maximum prime number checked in CPU test: 50000
Test execution summary:
total time: 500.6550s
total number of events: 10000
total time taken by event execution: 2002.3821
per-request statistics:
min: 171.32ms
avg: 200.24ms
max: 460.88ms
approx. 95 percentile: 224.74ms
Threads fairness:
events (avg/stddev): 2500.0000/6.00
execution time (avg/stddev): 500.5955/0.06
[1]+ Hecho sudo sysbench --num-threads=4 --validate=on --test=cpu --cpu-max-prime=50000 run
pi@raspberrypi:~ $ temp
19-02-2017 17:05:45.548 temp=67.7'C
19-02-2017 17:05:51.425 temp=65.5'C
19-02-2017 17:06:28.859 temp=60.1'C
19-02-2017 17:06:51.751 temp=58.0'C
19-02-2017 17:07:02.178 temp=57.5'C
19-02-2017 17:07:39.439 temp=54.8'C
19-02-2017 17:07:56.307 temp=54.8'C
19-02-2017 17:08:17.866 temp=54.8'C
19-02-2017 17:08:32.100 temp=53.7'C
19-02-2017 17:09:17.898 temp=52.1'C
19-02-2017 17:10:02.736 temp=51.0'C
19-02-2017 17:10:40.158 temp=51.5'C
19-02-2017 17:14:35.286 temp=49.4'C
