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 Optimasi-PHP-FPM
 ===============
 
-Catatan Pribadi untuk optimasi PHP-FPM
\ No newline at end of file
+Catatan Pribadi untuk optimasi PHP-FPM
+
+# Menyesuaikan child processes pada PHP-FPM (Nginx)
+
+Saat mengatur opsi ini pertimbangkan hal berikut:
+
+- Berapa lama permintaan rata-rata Anda ?
+- Berapa jumlah maksimum pengunjung simultan yang didapat situs ?
+- Berapa banyak memori yang dikonsumsi rata-rata setiap child proses ?
+
+## Tentukan apakah batas max_children telah tercapai.
+- `$ sudo grep max_children /var/log/php-fpm/error.log`
+
+Contoh Output :
+
+```sh
+[22-Mar-2020 12:34:09] WARNING: [pool www] server reached pm.max_children setting (50), consider raising it
+[22-Mar-2020 12:36:03] WARNING: [pool www] server reached pm.max_children setting (50), consider raising it
+[22-Mar-2020 12:37:35] WARNING: [pool www] server reached pm.max_children setting (50), consider raising it
+[22-Mar-2020 12:39:46] WARNING: [pool www] server reached pm.max_children setting (50), consider raising it
+[22-Mar-2020 12:53:40] WARNING: [pool www] server reached pm.max_children setting (50), consider raising it
+[22-Mar-2020 12:54:49] WARNING: [pool www] server reached pm.max_children setting (50), consider raising it
+[22-Mar-2020 13:01:19] WARNING: [pool www] server reached pm.max_children setting (20), consider raising it
+[22-Mar-2020 13:02:50] WARNING: [pool www] server reached pm.max_children setting (20), consider raising it
+[22-Mar-2020 13:03:03] WARNING: [pool www] server reached pm.max_children setting (20), consider raising it
+[22-Mar-2020 13:10:03] WARNING: [pool www] server reached pm.max_children setting (20), consider raising it
+[22-Mar-2020 13:12:56] WARNING: [pool www] server reached pm.max_children setting (14), consider raising it
+[22-Mar-2020 13:14:04] WARNING: [pool www] server reached pm.max_children setting (14), consider raising it
+[22-Mar-2020 13:15:05] WARNING: [pool www] server reached pm.max_children setting (14), consider raising it
+[22-Mar-2020 13:16:22] WARNING: [pool www] server reached pm.max_children setting (14), consider raising it
+[22-Mar-2020 13:17:39] WARNING: [pool www] server reached pm.max_children setting (45), consider raising it
+```
+
+## Tentukan RAM dan rata - rata pool memory.
+- `free -h`
+- All fpm processes: `ps -ylC php-fpm --sort:rss`
+- Average memory: `ps --no-headers -o "rss,cmd" -C php-fpm | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'`
+- All fpm processes memory: `ps -eo size,pid,user,command --sort -size | awk '{ hr=$1/1024 ; printf("%13.2f Mb ",hr) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }' | grep php-fpm`
+
+Output :
+
+```sh
+85.66 Mb php-fpm: pool www
+83.43 Mb php-fpm: pool www
+83.38 Mb php-fpm: pool www
+6.54 Mb php-fpm: master process (/etc/php-fpm.conf)
+0.32 Mb grep --color=auto php-fpm
+```
+
+## Hitung max_children
+### Based on RAM
+- `pm.max_children = Total RAM yang didedikasikan untuk server web / Ukuran maksimal child process`
+
+- System RAM: 2GB
+- Average Pool size: 83Mb
+- `pm.max_children = 1500MB / 83MB = 18`
+
+### Based on average script execution time
+- `max_children = (waktu eksekusi skrip PHP rata-rata) * (PHP requests per second)`
+- `visitors = max_children * (detik antara tampilan halaman) / (rata-rata waktu eksekusi)`
+
+## Configure
+`sudo vim /etc/php/7.0/fpm/pool.d/www.conf`
+
+```
+pm.max_children = 17
+pm.start_servers = 2
+pm.min_spare_servers = 1
+pm.max_spare_servers = 3
+pm.max_request = 1000
+```
+
+```
+; Choose how the process manager will control the number of child processes.
+; Possible Values:
+;   static  - a fixed number (pm.max_children) of child processes;
+;   dynamic - the number of child processes are set dynamically based on the
+;             following directives:
+;             pm.max_children      - the maximum number of children that can
+;                                    be alive at the same time.
+;
+;             pm.start_servers     - the number of children created on startup.
+;                                    this value must not be less than min_spare_servers 
+;                                    and not greater than max_spare_servers.
+;
+;             pm.min_spare_servers - the minimum number of children in 'idle'
+;                                    state (waiting to process). If the number
+;                                    of 'idle' processes is less than this
+;                                    number then some children will be created.
+;
+;             pm.max_spare_servers - the maximum number of children in 'idle'
+;                                    state (waiting to process). If the number
+;                                    of 'idle' processes is greater than this
+;                                    number then some children will be killed.
+; Note: This value is mandatory.
+```