PHP 7 Performance

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I’ve tried to reproduce this benchmark which compares PHP 7 with older versions on a WordPress server: http://talks.php.net/oz15#/wpbench

My configuration is nearly the same, the server has an i7, SSD, 16GB RAM and debian. The server software is nginx. Suprisingly my results differ a lot from the ones linked above.

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In my tests Siege (https://www.joedog.org/siege-home/) outputs the following:

For PHP 7.0.0RC1: 

siege -c100 -r100 http://10.22.255.133/wordpress/
** SIEGE 3.0.8
** Preparing 100 concurrent users for battle.
The server is now under siege..      done.

Transactions:                  10000 hits
Availability:                  100.00 %
Elapsed time:                  131.61 secs
Data transferred:              95.77 MB
Response time:                 0.75 secs
Transaction rate:              75.98 trans/sec
Throughput:                    0.73 MB/sec
Concurrency:                   56.98
Successful transactions:       10000
Failed transactions:           0
Longest transaction:           1.01
Shortest transaction:          0.04

For PHP 5.6.12: 

siege -c100 -r100 http://10.22.255.133/wordpress/
** SIEGE 3.0.8
** Preparing 100 concurrent users for battle.
The server is now under siege..      done.

Transactions:                  10000 hits
Availability:                  100.00 %
Elapsed time:                  63.41 secs
Data transferred:              95.77 MB
Response time:                 0.03 secs
Transaction rate:              157.70 trans/sec
Throughput:                    1.51 MB/sec
Concurrency:                   4.45
Successful transactions:       10000
Failed transactions:           0
Longest transaction:           0.63
Shortest transaction:          0.01

When looking at the transaction rate you can see, that PHP 5 is about two times faster than PHP 7. I can’t believe that.

Another interesting fact is, that running this benchmark (http://www.php-benchmark-script.com/) results in PHP 7 being about 3 times faster than PHP 5 (of course on the same server where I’ve also tested WordPress). The measured results were:

  • PHP 7.0.0RC1 | PHP 5.5.28
  • Math: 0.201 | 0.683
  • String Manipulation: 0.271 | 0.77
  • Loops: 0.166 | 0.486
  • If Else: 0.12 | 0.295

I’ve uploaded both phpinfo() files in case that helps:

Do you have any idea why PHP 7 is that much slower in my tests with WordPress?

With opcache enabled PHP 7 is actually twice as fast as PHP 5. Thanks Mjh for your hint!

I’ve made the following measurements on a randomly filled WordPress Server.

Siege now outputs the following for PHP 7.0.0RC1: 

Transactions:                  10000 hits
Availability:                 100.00 %
Elapsed time:                  62.14 secs
Data transferred:             604.20 MB
Response time:                  0.02 secs
Transaction rate:             160.93 trans/sec
Throughput:                     9.72 MB/sec
Concurrency:                    3.77
Successful transactions:       10000
Failed transactions:               0
Longest transaction:            0.41
Shortest transaction:           0.01

And PHP 5.6.12: 

siege -c100 -r100 http://10.22.255.133/wordpress/
** SIEGE 3.0.8
** Preparing 100 concurrent users for battle.
The server is now under siege..      done.

Transactions:                 10000 hits
Availability:                 100.00 %
Elapsed time:                 119.98 secs
Data transferred:             604.20 MB
Response time:                0.60 secs
Transaction rate:             83.35 trans/sec
Throughput:                   5.04 MB/sec
Concurrency:                  49.86
Successful transactions:      10000
Failed transactions:          0
Longest transaction:          4.06
Shortest transaction:         0.04
Post Views: 2

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2 comments

  1. According to the output of phpinfo you posted, opcache isn’t enabled for your PHP 7, while it is for PHP 5. That alone can amount for a huge difference.

  2. I currently have the same surprising results on the CLI side.

    One of my old projects uses a PHING build. It was running on PHP 5.3 then PHP 5.6.
    I tried using PHP 7 and noticed a huge difference. So i decided to time the script execution.

    FYI it is a real life projects with thousands of files processed during the build.

    Build using PHP 5.3.29:
    3 minutes and 44 seconds elapsed.

    Build using PHP 7.2.11:
    11 minutes and 41 seconds elapsed.

    I noticed the CLI did not have opcache activated, here is the results with opcache:

    Build using PHP 7.2.11 + opcache:
    12 minutes and 18 seconds elapsed.

    Yes, WORSE

    FYI:

    $ php --info |grep opcache
opcache.blacklist_filename => no value => no value
opcache.consistency_checks => 0 => 0
opcache.dups_fix => Off => Off
opcache.enable => On => On
opcache.enable_cli => On => On
opcache.enable_file_override => Off => Off
opcache.error_log => no value => no value
opcache.file_cache => no value => no value
opcache.file_cache_consistency_checks => 1 => 1
opcache.file_cache_only => 0 => 0
opcache.file_update_protection => 2 => 2
opcache.force_restart_timeout => 180 => 180
opcache.huge_code_pages => Off => Off
opcache.inherited_hack => On => On
opcache.interned_strings_buffer => 8 => 8
opcache.lockfile_path => /tmp => /tmp
opcache.log_verbosity_level => 1 => 1
opcache.max_accelerated_files => 10000 => 10000
opcache.max_file_size => 0 => 0
opcache.max_wasted_percentage => 5 => 5
opcache.memory_consumption => 128 => 128
opcache.opt_debug_level => 0 => 0
opcache.optimization_level => 0x7FFFBFFF => 0x7FFFBFFF
opcache.preferred_memory_model => no value => no value
opcache.protect_memory => 0 => 0
opcache.restrict_api => no value => no value
opcache.revalidate_freq => 2 => 2
opcache.revalidate_path => Off => Off
opcache.save_comments => 1 => 1
opcache.use_cwd => On => On
opcache.validate_permission => Off => Off
opcache.validate_root => Off => Off
opcache.validate_timestamps => On => On

    Btw, I have to say I never noticed a huge difference on prod with apache when switched from PHP 5 to PHP 7. Despites all of the bechmarks we see online, the difference is far from obvious.

    Neddless to say, for that project, I will stick to PHP 5 version.

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