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nginx - HHVM randomly stops running

The Background




Recently I've changed php5-fpm in favor of hhvm, that is really what they said, a "holly performance grial"



I've installed hhvm remove php5-fpm (is really a fallback needed??) following this instructions : https://bjornjohansen.no/hhvm-with-fallback-to-php.



I have multiple websites(domains) inside this VPS, and most of them are wordpress + nginx + W3TC + Ubuntu 12.0.4p + MariaDB 10ish



The Main Problem



Since the change, randomly hhvm suddenly stops running . Don't really know why , so I decide to follow the last step of the tutorial, installing ps-watcher and detecting if the service is not running and checking every 5 seconds to re-start it again.




The Configuration



hhvm.conf:



location ~ \.(hh|php)$ {
    proxy_intercept_errors on;
    #error_page 502=@fallback;

    try_files $uri =404;


    fastcgi_split_path_info ^(.+\.php)(/.+)$;

    fastcgi_keep_conn on;

    fastcgi_buffer_size 128k;
    fastcgi_buffers 256 16k;
    fastcgi_busy_buffers_size 256k;
    fastcgi_temp_file_write_size 256k;


    include         fastcgi_params;

    fastcgi_index   index.php;
    fastcgi_param   SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param   SERVER_NAME $host;
    fastcgi_pass    127.0.0.1:9000;
}

# location @fallback {


    #     try_files $uri =404;

    #     fastcgi_split_path_info ^(.+\.php)(/.+)$;

    #     include         fastcgi_params;
    #     fastcgi_index   index.php;
    #     fastcgi_param   SCRIPT_FILENAME $document_root$fastcgi_script_name;
    #     fastcgi_param   SERVER_NAME $host;
    #     fastcgi_pass    unix:/var/run/php5-fpm.sock;


# }


/etc/hhvm/server.ini



; php options

pid = /var/run/hhvm/pid

; hhvm specific


;hhvm.server.file_socket = /var/run/hhvm/hhvm.sock
hhvm.server.port = 9000
hhvm.server.type = fastcgi
hhvm.server.default_document = index.php
hhvm.log.use_log_file = true
hhvm.log.file = /var/log/hhvm/error.log
hhvm.repo.central.path = /var/run/hhvm/hhvm.hhbc



/etc/hhvm/php.ini



; php options
session.save_handler = files
session.save_path = /var/lib/php5
session.gc_maxlifetime = 1440

; hhvm specific
hhvm.log.level = Warning
hhvm.log.always_log_unhandled_exceptions = true

hhvm.log.runtime_error_reporting_level = 8191
hhvm.mysql.typed_results = false
hhvm.log.header = true
hhvm.log.natives_stack_trace = true

; Customs

max_execution_time = 300
max_input_time = 60
memory_limit = 128M

post_max_size = 12M
upload_max_filesize = 12M


tail /var/log/hhvm/error.log: Brought this Warning that W3TC Developers said that will be Fix next release (thes said this 2 releases ago :P )



[Tue Jan  6 23:27:30 2015] [hphp] [3730:7faf42fff700:1:000006] [] \nWarning: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference, value given in /sites/public/wp-includes/functions.php on line 3269
[Tue Jan  6 23:27:40 2015] [hphp] [3810:7f99bbfff700:1:000001] [] \nWarning: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference, value given in /sites/public/wp-includes/functions.php on line 3269



and a Bunch of several Wordpress problems releated with Template Incompatibilities.



Any adivice that could help me to detect what is happening.



thanks!

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