ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

13 years ago by jpauli — view source

unread

Laruence and I wrote articles about ZendMM internals.

You would find them at http://www.laruence.com/2011/11/09/2277.html and
http://julien-pauli.developpez.com/tutoriels/php/internals/zend-memory-manager/
.
You can use any translator to get them in English

For basic use, see the readme at
http://lxr.php.net/xref/PHP_5_4/Zend/README.ZEND_MM

Hope this helps :)

Julien.P

Hello,

Can somebody shed some light on these 2 defines? Thanks.

#define ZEND_MM_SMALL_FREE_BUCKET(heap, index) \ (zend_mm_free_block*)
((char*)&heap->free_buckets[index * 2] + \ sizeof(zend_mm_free_block*)

2 - \ sizeof(zend_mm_small_free_block)) #define
ZEND_MM_REST_BUCKET(heap)
(zend_mm_free_block*)((char*)&heap->rest_buckets[0] +
sizeof(zend_mm_free_block*) * 2 - \ sizeof(zend_mm_small_free_block))

13 years ago by Adi Mutu — view source

unread

Thanks Julien,

but i've already read your article using translator and did not found an answer to that (i've also sent you an email about Zend mm a few days ago)
laurence site looks down to me. Perhaps the link is wrong?

Thanks,
A.

From: jpauli jpauli@php.net
To: Adi Mutu adi_mutu06@yahoo.com
Cc: "internals@lists.php.net" internals@lists.php.net
Sent: Friday, March 2, 2012 3:43 PM
Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

Laruence and I wrote articles about ZendMM internals.

You would find them at http://www.laruence.com/2011/11/09/2277.html and
http://julien-pauli.developpez.com/tutoriels/php/internals/zend-memory-manager/
.
You can use any translator to get them in English

For basic use, see the readme at
http://lxr.php.net/xref/PHP_5_4/Zend/README.ZEND_MM

Hope this helps :)

Julien.P

Hello,

Can somebody shed some light on these 2 defines? Thanks.

#define ZEND_MM_SMALL_FREE_BUCKET(heap, index) \ (zend_mm_free_block*)
((char*)&heap->free_buckets[index * 2] + \ sizeof(zend_mm_free_block*)

2 - \ sizeof(zend_mm_small_free_block)) #define
ZEND_MM_REST_BUCKET(heap)
(zend_mm_free_block*)((char*)&heap->rest_buckets[0] +
sizeof(zend_mm_free_block*) * 2 - \ sizeof(zend_mm_small_free_block))

13 years ago by Ferenc Kovacs — view source

unread

Thanks Julien,

but i've already read your article using translator and did not found an
answer to that (i've also sent you an email about Zend mm a few days ago)
laurence site looks down to me. Perhaps the link is wrong?

Thanks,
A.

I blame the Great Firewall of China
could you try that the following link works for you:
http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=hu&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.laruence.com%2F2011%2F11%2F09%2F2277.html

--
Ferenc Kovács
@Tyr43l - http://tyrael.hu

13 years ago by Adi Mutu — view source

unread

Now that's really awesome.....:)
I have to do something so i can access and subscribe to that blog.
Are you serious about that firewall?
That would be my first time i actually encounter a problem because of this.

From: Ferenc Kovacs tyra3l@gmail.com
To: Adi Mutu adi_mutu06@yahoo.com
Cc: jpauli jpauli@php.net; "internals@lists.php.net" internals@lists.php.net
Sent: Friday, March 2, 2012 4:00 PM
Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

Thanks Julien,

but i've already read your article using translator and did not found an answer to that (i've also sent you an email about Zend mm a few days ago)
laurence site looks down to me. Perhaps the link is wrong?

Thanks,
A.

I blame the Great Firewall of China
could you try that the following link works for you:
http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=hu&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.laruence.com%2F2011%2F11%2F09%2F2277.html

Ferenc Kovács
@Tyr43l - http://tyrael.hu

13 years ago by Laruence — view source

unread

Now that's really awesome.....:)
I have to do something so i can access and subscribe to that blog.
Hi:

Google reader is a good choice~ :)

I am so glad you like it.

thanks .

Are you serious about that firewall?
That would be my first time i actually encounter a problem because of this.

From: Ferenc Kovacs tyra3l@gmail.com
To: Adi Mutu adi_mutu06@yahoo.com
Cc: jpauli jpauli@php.net; "internals@lists.php.net" internals@lists.php.net
Sent: Friday, March 2, 2012 4:00 PM
Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

Thanks Julien,

but i've already read your article using translator and did not found an answer to that (i've also sent you an email about Zend mm a few days ago)
laurence site looks down to me. Perhaps the link is wrong?

Thanks,
A.

I blame the Great Firewall of China
could you try that the following link works for you:
http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=hu&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.laruence.com%2F2011%2F11%2F09%2F2277.html

--
Ferenc Kovács
@Tyr43l - http://tyrael.hu

--
Laruence Xinchen Hui
http://www.laruence.com/

13 years ago by Adi Mutu — view source

unread

Already added in google reader......now i see the site is accesible also, strange.

I've looked at the picture, read your explanation, but i still didn't get it.....i'll think some more about this and perhaps i'll suggest you a better translation at the end.

Thanks!

From: Laruence laruence@php.net
To: Adi Mutu adi_mutu06@yahoo.com
Cc: Ferenc Kovacs tyra3l@gmail.com; jpauli jpauli@php.net; "internals@lists.php.net" internals@lists.php.net
Sent: Friday, March 2, 2012 4:52 PM
Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

Now that's really awesome.....:)
I have to do something so i can access and subscribe to that blog.
Hi:

Google reader is a good choice~ :)

I am so glad you like it.

thanks .

Are you serious about that firewall?
That would be my first time i actually encounter a problem because of this.

From: Ferenc Kovacs tyra3l@gmail.com
To: Adi Mutu adi_mutu06@yahoo.com
Cc: jpauli jpauli@php.net; "internals@lists.php.net" internals@lists.php.net
Sent: Friday, March 2, 2012 4:00 PM
Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

Thanks Julien,

but i've already read your article using translator and did not found an answer to that (i've also sent you an email about Zend mm a few days ago)
laurence site looks down to me. Perhaps the link is wrong?

Thanks,
A.

I blame the Great Firewall of China
could you try that the following link works for you:
http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=hu&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.laruence.com%2F2011%2F11%2F09%2F2277.html

--
Ferenc Kovács
@Tyr43l - http://tyrael.hu

--
Laruence Xinchen Hui
http://www.laruence.com/

13 years ago by jpauli — view source

unread

Thanks Julien,

but i've already read your article using translator and did not found an
answer to that (i've also sent you an email about Zend mm a few days ago)

Not seen that.

Anyway, I dont master all ZendMM stuff, I couldn't explain every line of
code. It's been mainly designed back in 2005, I wasn't here yet :)

It's not very hard to guess what it does, if you know how a memory manager
works. Basically, it does stuff that malloc() does internally, stuff
explained here, for example (
http://www.phrack.org/issues.html?issue=57&id=9#article) ; but for PHP
needs, and with multi-platform in mind.

Julien.P

laurence site looks down to me. Perhaps the link is wrong?

Thanks,
A.

From: jpauli jpauli@php.net
To: Adi Mutu adi_mutu06@yahoo.com
Cc: "internals@lists.php.net" internals@lists.php.net
Sent: Friday, March 2, 2012 3:43 PM
Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

Laruence and I wrote articles about ZendMM internals.

You would find them at http://www.laruence.com/2011/11/09/2277.html and

http://julien-pauli.developpez.com/tutoriels/php/internals/zend-memory-manager/
.
You can use any translator to get them in English

For basic use, see the readme at
http://lxr.php.net/xref/PHP_5_4/Zend/README.ZEND_MM

Hope this helps :)

Julien.P

Hello,

Can somebody shed some light on these 2 defines? Thanks.

#define ZEND_MM_SMALL_FREE_BUCKET(heap, index) \ (zend_mm_free_block*)
((char*)&heap->free_buckets[index * 2] +
sizeof(zend_mm_free_block*)

2 - \ sizeof(zend_mm_small_free_block)) #define
ZEND_MM_REST_BUCKET(heap)
(zend_mm_free_block*)((char*)&heap->rest_buckets[0] +
sizeof(zend_mm_free_block*) * 2 -
sizeof(zend_mm_small_free_block))

13 years ago by Laruence — view source

unread

Hello,

Can somebody shed some light on these 2 defines? Thanks.

#define ZEND_MM_SMALL_FREE_BUCKET(heap, index) \ (zend_mm_free_block*) ((char*)&heap->free_buckets[index * 2] + \ sizeof(zend_mm_free_block*) * 2 - \ sizeof(zend_mm_small_free_block)) #define ZEND_MM_REST_BUCKET(heap) \ (zend_mm_free_block*)((char*)&heap->rest_buckets[0] + \ sizeof(zend_mm_free_block*) * 2 - \ sizeof(zend_mm_small_free_block))

Hi:

the first MACRO is a tricky way to put a number of ZEND_NUM_BUCKETS
zend_mm_buckects into a fixed length array.

and yes, my site might be blocked by chinese GFW, but you can try
this: https://wiki.php.net/internals/zend_mm

plz see the red part of the first picture..

thanks

--
Laruence Xinchen Hui
http://www.laruence.com/

13 years ago by Stas Malyshev — view source

unread

Hi!

#define ZEND_MM_SMALL_FREE_BUCKET(heap, index)
(zend_mm_free_block*) ((char*)&heap->free_buckets[index * 2] +
sizeof(zend_mm_free_block*) * 2 -
sizeof(zend_mm_small_free_block))
#define
ZEND_MM_REST_BUCKET(heap)
(zend_mm_free_block*)((char*)&heap->rest_buckets[0] +
sizeof(zend_mm_free_block*) * 2 -
sizeof(zend_mm_small_free_block))

IIRC the purpose of these defines is that the MM caches small free
blocks so that it could find them faster, so that for example allocating
zvals (frequent case) goes faster. So it has a small cache for such
blocks, by size, so the allocator can for example quickly find a free
block of size of zval or of size of Hashtable. These macros try to find
such free block for given small size (first one) or for the rest of
blocks (i.e. bigger blocks which share one free list).

Stanislav Malyshev, Software Architect
SugarCRM: http://www.sugarcrm.com/
(408)454-6900 ext. 227

13 years ago by Adi Mutu — view source

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I think that caching part you're talking about is in function zend_mm_alloc_int......i don't see what caching has to do with these macros...
but i maybe mistaking of course. What i don't understand is those additions and substracting in those macros......but i'll read more tomorrow.

From: Stas Malyshev smalyshev@sugarcrm.com
To: Adi Mutu adi_mutu06@yahoo.com
Cc: "internals@lists.php.net" internals@lists.php.net
Sent: Friday, March 2, 2012 8:44 PM
Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

Hi!

#define ZEND_MM_SMALL_FREE_BUCKET(heap, index)
(zend_mm_free_block*) ((char*)&heap->free_buckets[index * 2] +
sizeof(zend_mm_free_block*) * 2 -
sizeof(zend_mm_small_free_block))
#define
ZEND_MM_REST_BUCKET(heap)
(zend_mm_free_block*)((char*)&heap->rest_buckets[0] +
sizeof(zend_mm_free_block*) * 2 -
sizeof(zend_mm_small_free_block))

IIRC the purpose of these defines is that the MM caches small free blocks so that it could find them faster, so that for example allocating zvals (frequent case) goes faster. So it has a small cache for such blocks, by size, so the allocator can for example quickly find a free block of size of zval or of size of Hashtable. These macros try to find such free block for given small size (first one) or for the rest of blocks (i.e. bigger blocks which share one free list).
-- Stanislav Malyshev, Software Architect
SugarCRM: http://www.sugarcrm.com/
(408)454-6900 ext. 227

ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET

I blame the Great Firewall of China could you try that the following link works for you: http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=hu&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.laruence.com%2F2011%2F11%2F09%2F2277.html

I blame the Great Firewall of China
could you try that the following link works for you:
http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=hu&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.laruence.com%2F2011%2F11%2F09%2F2277.html