{"id":29065,"date":"2026-02-14T08:39:42","date_gmt":"2026-02-14T08:39:42","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=29065"},"modified":"2026-02-14T10:21:04","modified_gmt":"2026-02-14T10:21:04","slug":"raspberry-pi-4%e3%81%97%e3%81%b0%e3%82%89%e3%81%8f%e7%99%bb%e6%9d%bf-3","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=29065","title":{"rendered":"Raspberry Pi 4\u3057\u3070\u3089\u304f\u767b\u677f (3)"},"content":{"rendered":"\n

Raspberry Pi 4 Model B RAM 4GBでまる4日ほど運用しました．定量的なデータは何もありませんが，LAN内のクライアント1<\/a><\/sup>からのアクセスでは，レスポンスがSlackware ARM 32bit時よりも少し改善された感じはしました．<\/p>\n\n\n\n

ただし，写真のupload時の処理時間に大差はないです2<\/a><\/sup>．<\/p>\n\n\n\n

今回は，同じRaspberry Pi 4 Model Bですが，RAM 8GBのものに置き換えました．RAM 4GBだと定常的な運転状態でswap (ZRAM)が500MB前後になります3<\/a><\/sup>．8GB RAMではswapが実質的にゼロなので，差は出ると思います．<\/p>\n\n\n

\n
\"\"
Redis Object Cacheの反応時間，最大のピークは90 ms<\/figcaption><\/figure>\n<\/div>\n\n\n

このRedis Object Cacheの反応時間のグラフの中央 (16:35) あたりの大きなピーク(90 ms)はハードウェア交換直後に複数のdaemonが起動したため反応時間が大きくなったと推測できます．このピークの前がRaspberry Pi 4 Model B RAM 4GB，後が同8GBです．反応時間の平均的な値は小さくなっているように見えます．<\/p>\n\n\n\n

この状態でまたしばらく運用してからRaspberry Pi 5に戻します．<\/p>\n\n\n

  1. M4 Mac mini, MacBook Air M4など． ↩︎<\/a><\/li>
  2. Uploadした写真をWordPressのシステムがいくつかのサイズに作り直します．当然写真によりますがだいたい16秒前後処理時間がかかります． ↩︎<\/a><\/li>
  3. ZRAMは1GBに設定しました． ↩︎<\/a><\/li><\/ol>","protected":false},"excerpt":{"rendered":"

    Raspberry Pi 4 Model B RAM 4GB\u3067\u307e\u308b4\u65e5\u307b\u3069\u904b\u7528\u3057\u307e\u3057\u305f\uff0e\u5b9a\u91cf\u7684\u306a\u30c7\u30fc\u30bf\u306f\u4f55\u3082\u3042\u308a\u307e\u305b\u3093\u304c\uff0cLAN\u5185\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u30a2\u30af\u30bb\u30b9\u3067\u306f\uff0c\u30ec\u30b9\u30dd\u30f3\u30b9\u304cSlackware ARM 32bit\u6642\u3088\u308a\u3082\u5c11\u3057\u6539\u5584\u3055\u308c\u305f\u611f\u3058\u306f\u3057\u307e\u3057\u305f\uff0e \u305f\u3060\u3057\uff0c\u5199\u771f\u306eupload\u6642\u306e\u51e6\u7406\u6642\u9593\u306b\u5927\u5dee\u306f\u306a\u3044\u3067\u3059\uff0e \u4eca\u56de\u306f\uff0c\u540c\u3058Raspberry Pi 4 Model B\u3067\u3059\u304c\uff0cRAM 8GB\u306e\u3082\u306e\u306b\u7f6e\u304d\u63db\u3048\u307e\u3057\u305f\uff0eRAM 4GB\u3060\u3068\u5b9a\u5e38\u7684\u306a\u904b\u8ee2\u72b6\u614b\u3067swap (ZRAM)\u304c500MB\u524d\u5f8c\u306b\u306a\u308a\u307e\u3059\uff0e8GB RAM\u3067\u306fswap\u304c\u5b9f\u8cea\u7684\u306b\u30bc\u30ed\u306a\u306e\u3067\uff0c\u5dee\u306f\u51fa\u308b\u3068\u601d\u3044\u307e\u3059\uff0e \u3053\u306eRedis Object Cache\u306e\u53cd\u5fdc\u6642\u9593\u306e\u30b0\u30e9\u30d5\u306e\u4e2d\u592e (16:35) \u3042\u305f\u308a\u306e\u5927\u304d\u306a\u30d4\u30fc\u30af(90 ms)\u306f\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u4ea4\u63db\u76f4\u5f8c\u306b\u8907\u6570\u306edaemon\u304c\u8d77\u52d5\u3057\u305f\u305f\u3081\u53cd\u5fdc\u6642\u9593\u304c\u5927\u304d\u304f\u306a\u3063\u305f\u3068\u63a8\u6e2c\u3067\u304d\u307e\u3059\uff0e\u3053\u306e\u30d4\u30fc\u30af\u306e\u524d\u304cRaspberry Pi 4 Model B RAM 4GB\uff0c\u5f8c\u304c\u540c8GB\u3067\u3059\uff0e\u53cd\u5fdc\u6642\u9593\u306e\u5e73\u5747\u7684\u306a\u5024\u306f\u5c0f\u3055\u304f\u306a\u3063\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u307e\u3059\uff0e \u3053\u306e\u72b6\u614b\u3067\u307e\u305f\u3057\u3070\u3089\u304f\u904b\u7528\u3057\u3066\u304b\u3089Raspberry Pi 5\u306b\u623b\u3057\u307e\u3059\uff0e<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_daextam_enable_autolinks":"1","footnotes":"[{\"content\":\"M4 Mac mini, MacBook Air M4\u306a\u3069\uff0e\",\"id\":\"42705543-dd84-41ec-9202-a6f7b747254c\"},{\"content\":\"Upload\u3057\u305f\u5199\u771f\u3092WordPress\u306e\u30b7\u30b9\u30c6\u30e0\u304c\u3044\u304f\u3064\u304b\u306e\u30b5\u30a4\u30ba\u306b\u4f5c\u308a\u76f4\u3057\u307e\u3059\uff0e\u5f53\u7136\u5199\u771f\u306b\u3088\u308a\u307e\u3059\u304c\u3060\u3044\u305f\u304416\u79d2\u524d\u5f8c\u51e6\u7406\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\uff0e\",\"id\":\"9eff65d7-5e44-4a7b-8d38-2cc34548cd22\"},{\"content\":\"ZRAM\u306f1GB\u306b\u8a2d\u5b9a\u3057\u307e\u3057\u305f\uff0e\",\"id\":\"cb4b30bc-00b7-40c9-bcb1-d28eb1a27ba8\"}]"},"categories":[9,6,27,4],"tags":[],"class_list":["post-29065","post","type-post","status-publish","format-standard","hentry","category-aarch64","category-debian","category-rasapberry-pi","category-wordpress"],"publishpress_future_action":{"enabled":false,"date":"2026-05-25 11:43:32","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/29065","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=29065"}],"version-history":[{"count":12,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/29065\/revisions"}],"predecessor-version":[{"id":29083,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/29065\/revisions\/29083"}],"wp:attachment":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=29065"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29065"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29065"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}