{"id":7733,"date":"2017-09-26T18:24:25","date_gmt":"2017-09-26T09:24:25","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=7733"},"modified":"2017-09-26T18:24:25","modified_gmt":"2017-09-26T09:24:25","slug":"raspberry-pi-3-%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc%e3%81%aecpugpu%e6%b8%a9%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=7733","title":{"rendered":"Raspberry Pi 3 \u30b5\u30fc\u30d0\u30fc\u306eCPU\/GPU\u6e29\u5ea6"},"content":{"rendered":"

昨日（2017\/09\/25）の朝から今朝まで，ほぼまる1日，10秒間隔で，Rapberry Pi 3のCPUとGPUの温度をログ（temp.logに書き込み）して，その中から，55℃以上のデータを抽出してみました1<\/a><\/sup>55℃以上のレコードは，全8352レコード中32レコード(0.38%)でした．<\/span>．<\/p>\n

Raspberry Pi 3は，Slackware ARM 14.2で動いていて，サーバーとしての無駄な負担を減らすため，GUIモードでなく，CUIモード（run level 3）にしています．CPUにはクリアケースのおまけでついてきたヒートシンクを貼り付けてありますが，ファンは付けていません．<\/p>\n

egrep \"5[5-9]\\.|[6-9][0-9]\\.\" temp.log \nCPU temp=55.8'C GPU temp=55.8'C Mon Sep 25 13:17:12 JST 2017\nCPU temp=55.3'C GPU temp=54.8'C Mon Sep 25 13:17:22 JST 2017\nCPU temp=54.7'C GPU temp=55.3'C Mon Sep 25 14:11:49 JST 2017\nCPU temp=56.3'C GPU temp=55.8'C Mon Sep 25 14:14:20 JST 2017\nCPU temp=55.8'C GPU temp=55.8'C Mon Sep 25 15:14:29 JST 2017\nCPU temp=54.7'C GPU temp=55.3'C Mon Sep 25 15:21:22 JST 2017\nCPU temp=54.7'C GPU temp=55.8'C Mon Sep 25 15:33:36 JST 2017\nCPU temp=55.8'C GPU temp=54.8'C Mon Sep 25 15:40:58 JST 2017\nCPU temp=55.8'C GPU temp=55.8'C Mon Sep 25 15:41:08 JST 2017\nCPU temp=55.3'C GPU temp=55.8'C Mon Sep 25 15:41:18 JST 2017\nCPU temp=55.3'C GPU temp=55.3'C Mon Sep 25 15:41:28 JST 2017\nCPU temp=55.8'C GPU temp=55.3'C Mon Sep 25 15:41:38 JST 2017\nCPU temp=55.8'C GPU temp=55.3'C Mon Sep 25 15:41:48 JST 2017\nCPU temp=55.3'C GPU temp=54.8'C Mon Sep 25 15:41:58 JST 2017\nCPU temp=55.8'C GPU temp=55.8'C Mon Sep 25 16:34:05 JST 2017\nCPU temp=54.7'C GPU temp=55.3'C Mon Sep 25 16:34:15 JST 2017\nCPU temp=54.7'C GPU temp=55.3'C Mon Sep 25 16:58:43 JST 2017\nCPU temp=54.7'C GPU temp=55.3'C Mon Sep 25 16:58:53 JST 2017\nCPU temp=54.7'C GPU temp=55.3'C Mon Sep 25 23:52:33 JST 2017\nCPU temp=55.3'C GPU temp=55.8'C Tue Sep 26 01:40:16 JST 2017\nCPU temp=56.9'C GPU temp=58.0'C Tue Sep 26 01:40:26 JST 2017\nCPU temp=57.4'C GPU temp=56.9'C Tue Sep 26 01:40:36 JST 2017\nCPU temp=58.5'C GPU temp=58.5'C Tue Sep 26 01:40:46 JST 2017\nCPU temp=59.0'C GPU temp=59.1'C Tue Sep 26 01:40:56 JST 2017\nCPU temp=58.5'C GPU temp=58.0'C Tue Sep 26 01:41:06 JST 2017\nCPU temp=59.0'C GPU temp=59.6'C Tue Sep 26 01:41:16 JST 2017\nCPU temp=55.8'C GPU temp=56.4'C Tue Sep 26 01:41:26 JST 2017\nCPU temp=55.8'C GPU temp=55.8'C Tue Sep 26 01:41:36 JST 2017\nCPU temp=55.8'C GPU temp=55.8'C Tue Sep 26 01:41:47 JST 2017\nCPU temp=55.8'C GPU temp=55.8'C Tue Sep 26 01:41:57 JST 2017\nCPU temp=56.3'C GPU temp=56.4'C Tue Sep 26 01:42:07 JST 2017\nCPU temp=55.8'C GPU temp=55.8'C Tue Sep 26 01:42:17 JST 2017<\/pre>\n
まずいえるのは，CPUとGPUの温度の差はほとんどないということとです．また，60℃を超えたことはありません2<\/a><\/sup>10秒ごとの記録なので，瞬間的に超えた可能性は否定できませんが．<\/span>．<\/p>\n
日中，室温が高いところに，ときどき高負荷がかかると，55℃をちょっと超えます．たまたま，topで観察していたら，imapdが1人で頑張っています．自分の持っているiOSのディバイス3機と公私のMacintoshからのIMAPのアクセスが集中した時だと思います．<\/p>\n
また，午前1:40:16から，約2分間連続して55℃を超えていますが，これは，slocateがディスク内の全ファイルのインデックスを更新しているためと思います．<\/p>\n
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