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https://www.php.net/manual/en/ref.shmop.php
It's not possible, because sysvshm uses a proprietry format, in essense it can ONLY be used within PHP unless of course you take time to figure out this format. So basically, the purpose of shmop is to provide a symple interface to shared memory that can be used with OTHER NON php shm creators. Hope this clears it up.
https://www.php.net/manual/en/function.shm-attach.php
shm_attach() returns an id that can be used to access the System V shared memory with the given key, the first call creates the shared memory segment with memsize and the optional perm-bits perm. A second call to shm_attach() for the same key will return a different shared memory identifier, but both identifiers access the same underlying shared memory.
https://www.php.net/manual/en/function.shm-put-var.php
shm_put_var() inserts or updates the variable with the given variable_key. Warnings (E_WARNING level) will be issued if shm_identifier is not a valid SysV shared memory index or if there was not enough shared memory remaining to complete your request.
https://grokbase.com/t/php/php-general/0715zpvw98/posix-shared-memory-support
Jan 05, 2007 · The user contributed notes say it differs from sysvshm. I take that to mean PHP's sysvshm module. shmop uses shmget, shmctl, and shmat which are the System V shm functions (need to use ipcs and ipcrm to manage them). Posix shared memory uses shm_open(), mmap(), and shm_unlink(). Guess I'll take the source for shmop and make posixshm and
https://github.com/php/php-src/commit/6afc3cede8848b4d04e1ae557cb9c945c610030f
The PHP Interpreter. Contribute to php/php-src development by creating an account on GitHub.
https://bugs.php.net/59823
Description: ----- PHP Fatal error: PHP Startup: apc_shm_create: shmget(0, 134217728, 914) failed: Cannot allocate memory. It is possible that the chosen SHM segment size …
https://support.acquia.com/hc/en-us/articles/360005248674-Finding-Resolving-Memory-Related-PHP-errors-in-Acquia-Cloud
The PHP memory limit is the maximum amount of RAM memory, in M, that a single PHP process can consume. Memory used by the MySQL client counts against the PHP memory limit. The default setting for PHP memory is adequate for most Drupal applications on Acquia Cloud, but you may see the following errors which are clear signs that the memory limit ...
https://www.php.net/manual/en/book.sem.php
shm_attach — Creates or open a shared memory segment; shm_detach — Disconnects from shared memory segment; shm_get_var — Returns a variable from shared memory; shm_has_var — Check whether a specific entry exists; shm_put_var — Inserts or updates a variable in shared memory; shm_remove_var — Removes a variable from shared memory
https://wordpress.org/support/topic/fatal-error-allowed-memory-size-of-805306368-bytes-exhausted-3/
Fatal error: Allowed memory size of 805306368 bytes exhausted (tried to allocate 15477334137940999888 bytes) I’m on Siteground, and if I add these lines as recommended by another wordpress.org thread into php.ini, the problem goes away: opcache.interned_strings_buffer = 8 opcache.memory_consumption = 256 opcache.enable = On
https://en.wikipedia.org/wiki/Shared_memory
In computer science, shared memory is memory that may be simultaneously accessed by multiple programs with an intent to provide communication among them or avoid redundant copies. Shared memory is an efficient means of passing data between programs. Depending on context, programs may run on a single processor or on multiple separate processors.
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