上次因为cpu的发热问题, 我把cpu的硅胶给重新换了下。想试试什么时候能再引发这个温度过热，cpu自动降频的问题.
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dmesg | grep cpu
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[22115.380360] CPU0: Core temperature above threshold, cpu clock throttled (total events = 1)
[22115.380362] CPU3: Package temperature above threshold, cpu clock throttled (total events = 1)
[22115.380364] CPU2: Core temperature above threshold, cpu clock throttled (total events = 1)
[22115.380365] CPU1: Package temperature above threshold, cpu clock throttled (total events = 1)
[22115.380368] CPU2: Package temperature above threshold, cpu clock throttled (total events = 1)
[22115.380373] CPU0: Package temperature above threshold, cpu clock throttled (total events = 1)
以前用的命令是
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dd if=/dev/zero of=/dev/null
不过今天打算用prime95来做。
2. 下载prime95开始测试
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mkdir -p prime95
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wget http://www.mersenne.org/ftp_root/gimps/p95v294b8.linux64.tar.gz
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tar zxvf p95v294b8.linux64.tar.gz
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root@kali:/opt/prime95# ./mprime
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Welcome to GIMPS, the hunt for huge prime numbers. You will be asked a
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few simple questions and then the program will contact the primenet server
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to get some work for your computer. Good
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Attention Mprime has gained a reputation as a useful
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stress testing tool for people that enjoy pushing their hardware to the
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limit. You are more than welcome to use this software for that purpose.
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Please select the stress testing choice below to avoid interfering with
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the PrimeNet server. Use the Options/Torture Test menu choice for your
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stress tests. Also, read the stress.txt file.
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If you want to both join GIMPS and run stress tests, then Join GIMPS and
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answer the questions. After the server gets some work for you, stop
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mprime, then run mprime -m and choose Options/Torture Test.
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Join Gimps? (Y=Yes, N=Just stress testing) (Y): n
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Number of torture test threads to run (4): 2
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Choose a type of torture test to run.
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1 = Small FFTs (maximum heat and FPU stress, data fits in L2 cache, RAM
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not tested much).
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2 = In-place large FFTs (maximum power consumption, some RAM tested).
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3 = Blend (tests some of everything, lots of RAM tested).
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11,12,13 = Allows you to fine tune the above three selections.
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Blend is the default. NOTE: if you fail the blend test, but can pass the
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small FFT test then your problem is likely bad memory or a bad memory
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controller.
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Type of torture test to run (3): 1
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Accept the answers above? (Y): y
在这里，我只用了２线程来跑这个测试，跑测试１＝Small FFTs。为什么不用4线程，因为经过我的测试，4线程瞬间就能把cpu给耗光，cpu占用会在90％以上。系统性能急速下降。
2. 开第二个shell, 执行vmstat 1,每秒打印一行，来检查系统性能。 下面这个是４线程测试的vmstat的结果，有大量的进程在等待无法执行(r列的数值远超cpu的个数)。cpu利用率us在90%以上，正常情况下，这个数值应该在85%下。
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r b swpd free buff cache si so bi bo in cs us sy id wa st
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5 0 0 4464356 422712 1432820 0 0 0 0 3161 4918 94 6 0 0 0
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6 0 0 4464004 422712 1433196 0 0 0 0 2761 4150 98 2 0 0 0
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8 0 0 4461152 422712 1435656 0 0 0 0 3412 5202 94 6 0 0 0
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5 0 0 4460036 422720 1436028 0 0 0 268 2747 4199 98 2 0 0 0
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5 0 0 4460780 422720 1435344 0 0 0 0 3040 4748 97 3 0 0 0
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5 0 0 4459664 422720 1436148 0 0 0 0 3033 4667 96 4 0 0 0
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4 0 0 4458764 422720 1436204 0 0 0 0 3426 5487 95 5 0 0 0
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4 0 0 4458300 422720 1436232 0 0 0 0 3225 4838 97 3 0 0 0
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4 0 0 4457928 422720 1436232 0 0 0 0 2764 4110 96 4 0 0 0
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4 0 0 4460824 422720 1432592 0 0 0 0 2227 2869 99 1 0 0 0
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4 0 0 4435760 422720 1457372 0 0 0 0 3789 6498 95 5 0 0 0
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4 0 0 4449720 422720 1443204 0 0 0 0 2623 4125 98 2 0 0 0
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4 0 0 4452672 422728 1439492 0 0 0 20 2645 3985 96 4 0 0 0
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4 0 0 4452812 422728 1439320 0 0 0 0 2841 4483 97 3 0 0 0
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4 0 0 4452316 422728 1439492 0 0 0 0 2708 4176 97 3 0 0 0
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4 0 0 4452972 422728 1435888 0 0 0 0 2694 4292 98 2 0 0 0
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5 0 0 4450716 422728 1435592 0 0 0 0 2369 3552 99 1 0 0 0
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5 0 0 4438948 422728 1435532 0 0 0 0 2317 3332 99 1 0 0 0
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4 0 0 4454244 422736 1436484 0 0 0 812 2926 4875 97 3 0 0 0
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4 0 0 4449152 422736 1441128 0 0 0 0 2699 4115 97 3 0 0 0
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6 0 0 4448720 422736 1440988 0 0 0 0 4631 8295 97 3 0 0 0
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procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
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r b swpd free buff cache si so bi bo in cs us sy id wa st
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6 0 0 4449804 422736 1439568 0 0 0 0 3648 6144 96 4 0 0 0
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4 0 0 4449680 422736 1439652 0 0 0 0 2588 4085 99 1 0 0 0
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5 0 0 4448768 422736 1439996 0 0 0 0 2779 4457 99 1 0 0 0
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4 0 0 4447696 422744 1441220 0 0 0 60 3036 4729 98 2 0 0 0
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4 0 0 4447572 422744 1441384 0 0 0 0 2655 3998 99 2 0 0 0
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8 0 0 4447448 422744 1441108 0 0 0 0 2772 4512 98 2 0 0 0
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4 0 0 4447764 422744 1440700 0 0 0 0 3381 5338 97 3 0 0 0
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6 0 0 4451128 422744 1436988 0 0 0 0 2724 3841 98 2 0 0 0
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4 0 0 4451780 422744 1435828 0 0 0 16 3340 4783 98 2 0 0 0
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4 0 0 4447820 422744 1439396 0 0 0 0 4191 7188 97 3 0 0 0
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4 0 0 4447076 422744 1440240 0 0 0 0 2950 4299 98 3 0 0 0
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5 0 0 4446456 422744 1439912 0 0 0 0 3001 4543 98 2 0 0 0
3. 开启i7z来检查cpu的频率，我的cpu是5200u. 标准频率2200.
linux kernel有governer 动态调整cpu的频率.
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Cpu speed from cpuinfo 2194.00Mhz
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cpuinfo might be wrong if cpufreq is enabled. To guess correctly try estimating
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Linux ccounting Turbo) 2194 MHz
CPU Multiplier 22x || Bus clock frequency (BCLK) 99.73 MHz
Socket [0] - [physical cores=2, logical cores=4, max online cores ever=2]
TURBO ENABLED on 2 Cores, Hyper Threading ON
Max Frequency without considering Turbo 2293.73 MHz (99.73 x [23])
Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is 27x/25x/25x/25x
Real Current Frequency 1441.98 MHz [99.73 x 14.46] (Max of below)
Core [core-id] :Actual Freq (Mult.)C0% Halt(C1)% C3 % C6 %
Core 1 [0]:1416.00 (14.20x)15.9 83.8 3.57 2.39
Core 2 [1]:1441.98 (14.46x) 22 80.4 2.76 2.4
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C0 = Processor running without halting
C1 = Processor running with halts (States >C0 are power saver modes with cores i
C3 = Cores running with PLL turned off and core cache turned off
C6, C7 = Everything in C3 + core state saved to last level cache, C7 is deeper t
Above values in table are in percentage over the last 1 sec
4. 检测5分钟后，停掉prime95，使用sensors来继续检查cpu的温度，是否cpu的温度能迅速的下降，检查dmesg，是否有cpu温度过高降频的event.
p, li { white-space: pre-wrap; }
对于笔记本cpu 5200u,开机温度50，正常工作70度, 极限到80-90度，只要不长时间在90度以上，应该是可以接受的.
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root@kali:~# dmesg |grep "cpu clock"
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[22115.380360] CPU0: Core temperature above threshold, cpu clock throttled (total events = 1)
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[22115.380362] CPU3: Package temperature above threshold, cpu clock throttled (total events = 1)
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[22115.380364] CPU2: Core temperature above threshold, cpu clock throttled (total events = 1)
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[22115.380365] CPU1: Package temperature above threshold, cpu clock throttled (total events = 1)
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[22115.380368] CPU2: Package temperature above threshold, cpu clock throttled (total events = 1)
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[22115.380373] CPU0: Package temperature above threshold, cpu clock throttled (total events = 1)
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[23696.734283] CPU0: Core temperature above threshold, cpu clock throttled (total events = 20090)
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[23696.734284] CPU2: Core temperature above threshold, cpu clock throttled (total events = 20090)
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[23696.734287] CPU3: Package temperature above threshold, cpu clock throttled (total events = 20276)
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[23696.734288] CPU1: Package temperature above threshold, cpu clock throttled (total events = 20276)
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[23696.734294] CPU2: Package temperature above threshold, cpu clock throttled (total events = 20276)
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[23696.734299] CPU0: Package temperature above threshold, cpu clock throttled (total events = 20276)
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root@kali:~# sensors
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acpitz-virtual-0
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Adapter: Virtual device
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temp1: +50.0°C (crit = +105.0°C)
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temp2: +0.0°C (crit = +105.0°C)
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coretemp-isa-0000
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Adapter: ISA adapter
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Package id 0: +49.0°C (high = +105.0°C, crit = +105.0°C)
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Core 0: +48.0°C (high = +105.0°C, crit = +105.0°C)
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Core 1: +48.0°C (high = +105.0°C, crit = +105.0°C)
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