私のRaspberry Piには、Arch ARMを含む128GB SDカードがあります。
- Apache
- Next クラウド
インストールするとSDカードと接続が続くようです。調べiotopてみると、mysqldほとんどのデータをディスクに書き込む過程のようです。それから私はmysqlシェルで以下を見つけました：
show processlist;
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------+----------+
| Id | User | Host | db | Command | Time | State | Info | Progress |
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------+----------+
| 1 | system user | | NULL | Daemon | NULL | InnoDB purge coordinator | NULL | 0.000 |
| 2 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 3 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 4 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 5 | system user | | NULL | Daemon | NULL | InnoDB shutdown handler | NULL | 0.000 |
| 1846 | root | localhost | NULL | Query | 0 | Init | show processlist | 0.000 |
| 1852 | oc_stdcerr13 | localhost | nextcloud | Sleep | 0 | | NULL | 0.000 |
| 1853 | oc_stdcerr13 | localhost | nextcloud | Sleep | 0 | | NULL | 0.000 |
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------+----------+
8 rows in set (0.001 sec)
SDカードでリラックスするにはどうすればよいですか？/var/logそして/tmpすでにラムディスクにあります（tmpfs）
その後、コマンドを実行し続けると、show processlist次も表示されます。
show processlist;
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------------------------------------------------------------------------------------------+----------+
| Id | User | Host | db | Command | Time | State | Info | Progress |
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------------------------------------------------------------------------------------------+----------+
| 1 | system user | | NULL | Daemon | NULL | InnoDB purge coordinator | NULL | 0.000 |
| 2 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 3 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 4 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 5 | system user | | NULL | Daemon | NULL | InnoDB shutdown handler | NULL | 0.000 |
| 2061 | oc_stdcerr13 | localhost | nextcloud | Query | 0 | Init | SELECT `filecache`.`fileid`, `storage`, `path`, `path_hash`, `filecache`.`parent`, `name`, `mimetype | 0.000 |
| 2062 | root | localhost | NULL | Query | 0 | Init | show processlist | 0.000 |
| 2063 | oc_stdcerr13 | localhost | nextcloud | Sleep | 0 | | NULL | 0.000 |
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------------------------------------------------------------------------------------------+----------+
8 rows in set (0.001 sec)
MariaDB [(none)]> show processlist;
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------------------------------------------------------------------------------------------+----------+
| Id | User | Host | db | Command | Time | State | Info | Progress |
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------------------------------------------------------------------------------------------+----------+
| 1 | system user | | NULL | Daemon | NULL | InnoDB purge coordinator | NULL | 0.000 |
| 2 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 3 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 4 | system user | | NULL | Daemon | NULL | InnoDB purge worker | NULL | 0.000 |
| 5 | system user | | NULL | Daemon | NULL | InnoDB shutdown handler | NULL | 0.000 |
| 2061 | oc_stdcerr13 | localhost | nextcloud | Query | 0 | Init | UPDATE `oc_filecache` SET `size` = '-1' WHERE (`fileid` = 15955) AND ((`size` <> '-1') OR (`size` IS | 0.000 |
| 2062 | root | localhost | NULL | Query | 0 | Init | show processlist | 0.000 |
| 2063 | oc_stdcerr13 | localhost | nextcloud | Sleep | 0 | | NULL | 0.000 |
+------+--------------+-----------+-----------+---------+------+--------------------------+------------------------------------------------------------------------------------------------------+----------+
8 rows in set (0.001 sec)