Memory Issue

Hi everyone,

Recently migrated a site from one host to another. Since the migration, site load is extremely slow, about 17-25 seconds. Upon further investigation, I was hitting a memory cap. This was no big deal at the time I was on shared hosting and migrated to a VPS. I am now on my VPS and can see my site 1GB of RAM and the server then crashes and restarts. I tested disabling all my plugins and have ruled them out as the issue still occurs. I am leaning to a PHP issue.

Old server:
OS Type: Linux pod-130005 3.13.0-141-generic #190-Ubuntu SMP Fri Jan 19 12:52:38 UTC 2018 x86_64 (64 bit)
Server Software: Apache
CPU Cores: n/a Cores
Load Average: n/a
IP (Hostname): 127.0.0.1 (pod-130005)
Disk Space: 0.00 KB (0%) used of 0.00 KB total
Database Size: 38.85 MB
Database Name (Hostname): wp_keystoliteracy (127.0.0.1)
MySQL Version: 5.7.20-19-log
Database Charset (Collate): utf8 (utf8_unicode_ci)
Document Root: /nas/wp/www/sites/keystoliteracy
Theme Path: /nas/content/live/keystoliteracy/wp-content/themes/Divi
WP Locale (Charset): en-US (UTF-8)
Server Timezone (WP): UTC (America/New_York)
PHP Version: 7.0.25-0ubuntu0.16.04.1
PHP Extensions: Core, date, libxml, openssl, pcre, zlib, filter, hash, Reflection, SPL, session, standard, apache2handler, mysqlnd, PDO, xml, bcmath, bz2, calendar, ctype, curl, dba, dom, mbstring, fileinfo, ftp, gd, gettext, iconv, igbinary, imagick, imap, intl, json, ldap, exif, mcrypt, memcached, mysqli, newrelic, pdo_mysql, Phar, posix, readline, redis, shmop, SimpleXML, soap, sockets, ssh2, sysvmsg, sysvsem, sysvshm, tokenizer, uopz, wddx, xmlreader, xmlrpc, xmlwriter, xsl, zip, ionCube Loader, Zend OPcache
Max Upload, Post Size (Input Vars): 50M, 100M (1000)
Memory Usage: 26M (5%) of 512M (actual limit)
WP Memory Limit: 40M (defined limit)
WP Admin Memory Limit: 512M (defined limit)
WP Debug: Disabled (no logging, display)
Opcache Size (Max Files, Revalidate): 64M (2000, 2 secs)
Page Cache (Plugin): Enabled
Object Cache: Enabled

New Server
OS Type: Linux ps596454 3.14.52-vs2.3.6.15-1 #1 SMP Wed Nov 2 10:45:38 UTC 2016 x86_64 (64 bit)
Server Software: Apache
CPU Cores: 16 Cores
Load Average: 0, 0, 0
IP (Hostname): 69.163.238.173 (ps596454)
Disk Space: 3.27 GB (11%) used of 30.00 GB total
Database Size: 1.11 MB
Database Name (Hostname): keystoliteracy_com_1 (mysql.keystoliteracy.com)
MySQL Version: 5.6.34-log
Database Charset (Collate): utf8 (n/a)
Document Root: /home/keystoliteracy/keystoliteracy.com
Theme Path: /home/keystoliteracy/keystoliteracy.com/wp-content/themes/twentyseventeen
WP Locale (Charset): en-US (UTF-8)
Server Timezone (WP): UTC (UTC+0)
PHP Version: 7.0.27
PHP Extensions: Core, date, libxml, pcre, sqlite3, filter, mbstring, SPL, PDO, Reflection, pdo_sqlite, hash, session, cgi-fcgi, bcmath, bz2, calendar, ctype, curl, dom, standard, ftp, gd, gettext, exif, iconv, imap, json, mcrypt, mysqlnd, openssl, pcntl, pdo_mysql, posix, pspell, mysqli, SimpleXML, soap, sockets, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib, imagick, memcached
Max Upload, Post Size (Input Vars): 64M, 65M (1000)
Memory Usage: 2M (1%) of 256M (actual limit)
WP Memory Limit: 40M (defined limit)
WP Admin Memory Limit: 256M (defined limit)
WP Debug: Disabled (no logging, display)
Opcache Size (Max Files, Revalidate): 0 (0, n/a secs)
Page Cache (Plugin): Disabled
Object Cache: Disabled

The biggest thing I see is that MySQL is one version older and there are a lot of missing PHP extensions on the new host versus the old.

After lots of testing, memory seems to be fairly stable, although high, until I start to upload the “Uploads” part of the restore.

Any help would be a great start!