Настройте pm.start_servers или pm.min / max_spare_servers

В связи с приближающимся событием, мы ожидаем высокий трафик (около 2000 одновременных пользователей) в течение нескольких недель на нашем веб-сайте электронной коммерции на базе Magento2, работающем на Ubuntu, NGINX и PHP7.1-fpm. Поскольку наш каталог довольно велик, мы обновили нашу дроплет Digitalocean до самых высоких спецификаций: 192 ГБ ОЗУ и 32 виртуальных ЦП.

Сайт работает молниеносно, однако, как только мы достигнем 800+ пользователей, он начнет работать довольно медленно, и через некоторое время он будет показывать 502 ошибки Bad Gateway, которые мы не можем себе позволить во время этого временного события.

Наши последние ошибки теперь связаны с pm.start_servers или pm.min / max_spare_servers, а именно:

    [16-Mar-2020 21:50:35] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 0 idle$
    [16-Mar-2020 21:50:36] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 0 idl$

Мы попробовали несколько настроек, но ничего не работает надежно. Вот несколько настроек:

/etc/php/7.1/fpm/pool.d/www.conf:

    pm = dynamic
    pm.start_servers = 20
    pm.min_spare_servers = 20
    pm.max_spare_servers = 50
    ;pm.process_idle_timeout = 10s;
    pm.max_requests = 0

Итак, теперь мы ищем решение или способ их точного расчета? Есть ли какие-то другие соображения или настройки, которые мы должны изменить?

Вот наш Magento nginx.conf:

    root $MAGE_ROOT/pub;
    index index.php;
    autoindex off;
    charset UTF-8;
    error_page 404 403 = /errors/404.php;
    #add_header "X-UA-Compatible" "IE=Edge";

    # PHP entry point for setup application
    location ~* ^/setup($|/) {
        root $MAGE_ROOT;
        location ~ ^/setup/index.php {
            fastcgi_pass   fastcgi_backend;

            fastcgi_param  PHP_FLAG  "session.auto_start=off \n suhosin.session.cryptua=off";
            fastcgi_param  PHP_VALUE "memory_limit=2048M \n max_execution_time=18000";
            fastcgi_read_timeout 600s;
            fastcgi_connect_timeout 600s;
        fastcgi_buffers 256 16k;
        fastcgi_max_temp_file_size 0;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }

        location ~ ^/setup/(?!pub/). {
            deny all;
        }

        location ~ ^/setup/pub/ {
            add_header X-Frame-Options "SAMEORIGIN";
        }
    }

    # PHP entry point for update application
    location ~* ^/update($|/) {
        root $MAGE_ROOT;

        location ~ ^/update/index.php {
            fastcgi_split_path_info ^(/update/index.php)(/.+)$;
            fastcgi_pass   fastcgi_backend;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            fastcgi_param  PATH_INFO        $fastcgi_path_info;
            include        fastcgi_params;
        }

        # Deny everything but index.php
        location ~ ^/update/(?!pub/). {
            deny all;
        }

        location ~ ^/update/pub/ {
            add_header X-Frame-Options "SAMEORIGIN";
        }
    }

    location / {
        try_files $uri $uri/ /index.php$is_args$args;
    }

    location /pub/ {
        location ~ ^/pub/media/(downloadable|customer|import|theme_customization/.*\.xml) {
            deny all;
        }
        alias $MAGE_ROOT/pub/;
        add_header X-Frame-Options "SAMEORIGIN";
    }

    location /static/ {
        # Uncomment the following line in production mode
        # expires max;

        # Remove signature of the static files that is used to overcome the browser cache
        location ~ ^/static/version {
            rewrite ^/static/(version[^/]+/)?(.*)$ /static/$2 last;
        }

        location ~* \.(ico|jpg|jpeg|png|gif|svg|js|css|swf|eot|ttf|otf|woff|woff2)$ {
           # add_header Cache-Control "public";
            add_header X-Frame-Options "SAMEORIGIN";
            expires +1y;

            if (!-f $request_filename) {
                rewrite ^/static/?(.*)$ /static.php?resource=$1 last;
            }
        }
        location ~* \.(zip|gz|gzip|bz2|csv|xml)$ {
           # add_header Cache-Control "no-store";
            add_header X-Frame-Options "SAMEORIGIN";
            expires    off;

            if (!-f $request_filename) {
               rewrite ^/static/?(.*)$ /static.php?resource=$1 last;
            }
        }
        if (!-f $request_filename) {
            rewrite ^/static/?(.*)$ /static.php?resource=$1 last;
        }
        add_header X-Frame-Options "SAMEORIGIN";
    }

    location /media/ {
        try_files $uri $uri/ /get.php$is_args$args;

        location ~ ^/media/theme_customization/.*\.xml {
            deny all;
        }

        location ~* \.(ico|jpg|jpeg|png|gif|svg|js|css|swf|eot|ttf|otf|woff|woff2)$ {
           # add_header Cache-Control "public";
            add_header X-Frame-Options "SAMEORIGIN";
            expires +1y;
            try_files $uri $uri/ /get.php$is_args$args;
        }
        location ~* \.(zip|gz|gzip|bz2|csv|xml)$ {
           # add_header Cache-Control "no-store";
            add_header X-Frame-Options "SAMEORIGIN";
            expires    off;
            try_files $uri $uri/ /get.php$is_args$args;
        }
        add_header X-Frame-Options "SAMEORIGIN";
    }

    location /media/customer/ {
        deny all;
    }

    location /media/downloadable/ {
        deny all;
    }

    location /media/import/ {
        deny all;
    }


    location /Preread/ {

            #add_header Cache-Control "no-store";
            #add_header X-Frame-Options "SAMEORIGIN";

            root /var/www/html/;
        #try_files $uri $uri/ /Preread/index.php?$args;
        #try_files $uri $uri/ /Preread/index.php?q=$uri&$args;
            #index index.php index.html index.htm;
        #try_files $uri $uri/ /index.php?q=$uri&$args;
            try_files $uri $uri/ /index.php?q=$uri&$args;
        #try_files $uri $uri/ /get.php$is_args$args;
        #allow all;
    #   try_files $uri $uri/ /get.php$is_args$args;
    }


    # PHP entry point for main application
    location ~ (index|get|static|report|404|503|cs|davidfile|health_check)\.php$ {
        try_files $uri =404;
        fastcgi_pass   fastcgi_backend;
        fastcgi_buffers 1024 4k;

        fastcgi_param  PHP_FLAG  "session.auto_start=off \n suhosin.session.cryptua=off";
        fastcgi_param  PHP_VALUE "memory_limit=1048M \n max_execution_time=18000";
        fastcgi_read_timeout 600s;
        fastcgi_connect_timeout 600s;

        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include        fastcgi_params;
    }

    gzip on;
    gzip_disable "msie6";

    gzip_comp_level 6;
    gzip_min_length 1100;
    gzip_buffers 16 8k;
    gzip_proxied any;
    gzip_types
        text/plain
        text/css
        text/js
        text/xml
        text/javascript
        application/javascript
        application/x-javascript
        application/json
        application/xml
        application/xml+rss
        image/svg+xml;
    gzip_vary on;

    # Banned locations (only reached if the earlier PHP entry point regexes don't match)
    location ~* (\.php$|\.htaccess$|\.git) {
        deny all;
    }

Будем очень признательны за помощь экспертов, спасибо