PHP 7 new engine

1. PHP 7 new engine

2. PHP 7 new internals
 Full 64bit support
 New Thread Safety mechanism
 New engine memory management
 New optimized executor
 New optimized structures

3. PHP 7 full 64bit engine
 PHP was known to be platform dependent on this crucial
criteria
 LP64: Linux64 (and most Unixes)
 LLP64: Windows64
 ILP64: SPARC64
http://www.unix.org/whitepapers/64bit.html
string size signed integer
Platform int long
LP64 32 64
LLP64 32 32
ILP64 64 64

4. PHP 7 full 64bit engine
 PHP 7 now uses platform independant sizes
 Strings > 2^31
 Real 64bit userland PHP integers
 LFS (Large File Support)
 64bits hash keys
 Whatever your platform (OS) : consistency

5. PHP 7 new memory management
 PHP 7 has reworked every memory management
routine
 Use less heap and more stack
 Zvals are stack allocated
 refcount management more accurate
 Scalar types are no longer refcounted
 Redevelop a new MM heap, more optimized
 Based on sized pools (small, medium and large)
 CPU cache friendly
 Concepts borrowed from tcmalloc

6. PHP 7 thread safety
 PHP7 has reworked its thread safety mechanism
routine
 PHP 5 thread safety routine had a ~20% perf impact
 This is no more the case in PHP 7
 Still some more work to do, but lighter
 TLS is now mature, and it is used
 For PHP under Windows (mandatory)
 For PHP under Unix, if asked for (usually not)

7. PHP 7 new structures
 Critical structures have been reworked
 More memory friendly
 More CPU friendly (data alignment, cache friendly)
 Strings are now refcounted
 Objects now share their refcount with other types
 Wasn't the case in PHP5
 The engine Executor uses a full new stack frame to
push and manage arguments
 Function calls have been heavilly reworked

8. PHP 7 performances

9. PHP 7 performances
 A lot of tweaks have been performed against PHP 7
code performances.
 A lot of internal changes - invisible to userland - have
been performed to have a more performant language
 CPU cache misses have been heavilly worked on
 Spacial locality of code is improved
 This results in a language beeing at least twice fast
and that consumes at least twice less memory

10. PHP 7 performances
... ...
$x = TEST 0.643 0.247
$x = $_GET 0.848 0.452
$x = $GLOBALS['v'] 1.182 0.787
$x = $hash['v'] 1.025 0.629
$x = $str[0] 1.671 1.275
$x = $a ?: null 0.831 0.435
$x = $f ?: tmp 1.349 0.953
$x = $f ? $f : $a 0.919 0.523
$x = $f ? $f : tmp 1.361 0.965
------------------------
Total 34.773
... ...
$x = TEST 0.440 0.257
$x = $_GET 0.603 0.421
$x = $GLOBALS['v'] 0.930 0.748
$x = $hash['v'] 0.669 0.486
$x = $str[0] 1.116 0.934
$x = $a ?: null 0.527 0.344
$x = $f ?: tmp 0.611 0.429
$x = $f ? $f : $a 0.550 0.367
$x = $f ? $f : tmp 0.569 0.386
------------------------
Total 20.440
PHP7PHP5.6
Zend/micro_bench.php

11. PHP 7 performances
Time: 17.62 seconds, Memory: 297.50Mb
Time: 7.21 seconds, Memory: 104.00Mb
PHP7
PHP5.6
PHPUnit in Symfony2 components
Time gain ~ 60%
Memory gain ~ 60%

12. PHP 7 CPU friendly
PHP 7.0.4 (debug)
306,006739 task-clock
1 446 context-switches
4 330 page-faults
787 684 146 cycles
817 673 456 instructions
121 452 445 branches
3 356 650 branch-misses
5 741 559 cache-references
873 581 cache-misses
0,334226815 seconds time elapsed
PHP 5.6.20 (debug)
456,483483 task-clock
1 405 context-switches
8 633 page-faults
1 163 771 607 cycles
1 247 617 395 instructions
181 700 375 branches
5 257 940 branch-misses
9 085 235 cache-references
1 108 044 cache-misses
0,468451813 seconds time elapsed

13. PHP 7 performances
 Take care of synthetic benchmarks
 They only demonstrates basic use cases
 Run your own benchmarks
 Run your own applications against PHP 7
 On a big average, you can expect dividing CPU
time and memory consumption by a factor of 2
compared to PHP-5.6, probably even more than
2

14. PHP 7 is released :-)
get it now <3

15. Thank you for listening !