Bug #70621 [Opn]: gmp on windows much faster with php 5.2
Edit report at https://bugs.php.net/bug.php?id=70621&edit=1
ID: 70621
User updated by: anna1008 at t-online dot de
Reported by: anna1008 at t-online dot de
-Summary: gmp much faster with old VC6-builds
+Summary: gmp on windows much faster with php 5.2
Status: Open
Type: Bug
Package: Performance problem
Operating System: Windows 7 Home Premium 32bit SP1
PHP Version: 5.6.14
Block user comment: N
Private report: N
New Comment:
I don't have a linux environment installed, but my provider offers different php versions.
Here are the results with Ubuntu/Apache mod:
5.2.17-nmm2 e=16 dt=0.100540876389 sec
5.2.17-nmm2 e=24 dt=0.789358854294 sec
5.2.17-nmm2 e=32 dt=6.72271108627 sec
5.3.28-nmm4 e=16 dt=0.107861995697 sec
5.3.28-nmm4 e=24 dt=0.798853874207 sec
5.3.28-nmm4 e=32 dt=6.73689603806 sec
5.4.42-nmm1 e=16 dt=0.105895042419 sec
5.4.42-nmm1 e=24 dt=0.763396978378 sec
5.4.42-nmm1 e=32 dt=6.51089191437 sec
5.5.26-nmm1 e=16 dt=0.111220121384 sec
5.5.26-nmm1 e=24 dt=0.796920061111 sec
5.5.26-nmm1 e=32 dt=6.52268314362 sec
5.6.10-nmm1 e=16 dt=0.0878250598907 sec
5.6.10-nmm1 e=24 dt=0.723581075668 sec
5.6.10-nmm1 e=32 dt=6.16323590279 sec
No big differences, but all also much slower than php-5.2.17-Win32-VC6-x86 in CLI mode.
Previous Comments:
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[2015-10-03 11:58:06] anna1008 at t-online dot de
@nikic:
Yes, it's better to say: "the 5.2-build is much faster than the following builds". I
didn't want to relate it to the compiler or anything else. But I wouldn't exclude the
compiler as a reason, when I consider that I need to install a Microsoft "Visual C++
Redistributable" to run the builds...
Here are more results with all available lastest 5.x-builds.
When I look at the php-gmp-changelog I can only see one big change:
the change from php resource to php object in 5.6
(other changes are mostly adding of missing gmp-functions).
But the slowdown already began with 5.3 and became real big with 5.4.
my results with php-5.2.17-Win32-VC6-x86:
5.2.17 e=16 dt=0.047152042388916 sec
5.2.17 e=24 dt=0.27974796295166 sec
5.2.17 e=32 dt=2.1529459953308 sec
my results with php-5.3.29-Win32-VC9-x86:
5.3.29 e=16 dt=0.060003995895386 sec
5.3.29 e=24 dt=0.39502215385437 sec
5.3.29 e=32 dt=3.2831878662109 sec
my results with php-5.4.45-Win32-VC9-x86:
5.4.45 e=16 dt=0.052003145217896 sec
5.4.45 e=24 dt=0.58403301239014 sec
5.4.45 e=32 dt=9.3995378017426 sec
my results with php-5.5.30-Win32-VC11-x86:
5.5.30 e=16 dt=0.051002025604248 sec
5.5.30 e=24 dt=0.55403208732605 sec
5.5.30 e=32 dt=8.8055038452148 sec
my results with php-5.6.14-Win32-VC11-x86:
5.6.14 e=16 dt=0.046002864837646 sec
5.6.14 e=24 dt=0.51803016662598 sec
5.6.14 e=32 dt=8.6654949188232 sec
.
------------------------------------------------------------------------
[2015-10-03 07:57:01] nikic@php.net
I can confirm that there is a large GMP slowdown between PHP 5.3 and 5.4, at least on Windows. I
kindof doubt this is related to VC versions though.
------------------------------------------------------------------------
[2015-10-02 10:23:18] anna1008 at t-online dot de
Description:
------------
I've experienced slow performance of the recent VC11 builds compared to the old VC6 builds when
running gmp_*-functions on big integers. My test script factorizes the first 1,000 integers >=
2^16, 2^24 and 2^32 with trial division. All tests were executed in CLI and shared the same php.ini
(default production-ini just with gmp extension).
Test script:
---------------
<?php
for ($e = 16; $e <= 32; $e+=8) { # 16, 24, 32
$n = gmp_pow(2, $e); # n := 2^e
$t0 = microtime(true);
for ($i = 0; $i < 1000; $i++) {
trialdiv($n);
$n = gmp_add($n, 1); # n++
}
$dt = microtime(true) - $t0;
echo phpversion() . " e=$e dt=$dt sec\n";
}
function trialdiv($n) {
if (gmp_prob_prime($n) != 0) return; # n is probably or surely prime
$p = gmp_init(2); # start with prime 2
for (;;) {
if (gmp_cmp(gmp_mul($p, $p), $n) > 0) return; # p^2 > n, trial division complete
while (gmp_cmp(gmp_mod($n, $p), 0) == 0) $n = gmp_divexact($n, $p); # while p divides n do n:= n/p
$p = gmp_nextprime($p); # try next prime
}
}
?>
Expected result:
----------------
I've expected marginal performance differences between the old VC6-builds and the recent
VC11-builds.
Actual result:
--------------
my results with php-5.2.14-Win32-VC6-x86:
5.2.14 e=16 dt=0.046411037445068 sec
5.2.14 e=24 dt=0.27050685882568 sec
5.2.14 e=32 dt=2.0851769447327 sec
my results with php-5.6.14-Win32-VC11-x86:
5.6.14 e=16 dt=0.046800136566162 sec
5.6.14 e=24 dt=0.51480078697205 sec
5.6.14 e=32 dt=8.533215045929 sec
summary:
At 2^16 the differences are marginal.
At 2^24 the VC6-build is 1.9 times faster
At 2^32 the VC6-build is 4.1 times faster.
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