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Top Forums UNIX for Beginners Questions & Answers Interpreting Linux's free command output Post 303010992 by Peasant on Thursday 11th of January 2018 12:58:27 PM
Old 01-11-2018
Lets say we have two machines with simplified memory status :

10 GB ram, 5 GB buffers & cache, 5 GB free completely.
10 GB ram, 1 GB buffers & cache (lets say you enforce those), 9 GB free completely.

A 64 bit program requests 8 GB of RAM.
How much latency difference is involved in both scenarios when request is made ?

Can someone from kernel programmer perspective say is memory fragmentation issue when dealing with extreme sizes ?
How much time is lost on traversing all those structures, see what to return etc ?

Thank you!

Regards
Peasant.
 

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WINCACHE_OCACHE_MEMINFO(3)						 1						WINCACHE_OCACHE_MEMINFO(3)

wincache_ocache_meminfo - Retrieves information about opcode cache memory usage

SYNOPSIS
array wincache_ocache_meminfo (void ) DESCRIPTION
Retrieves information about memory usage by opcode cache. RETURN VALUES
Array of meta data about opcode cache memory usage or FALSE on failure The array returned by this function contains the following elements: o memory_total - amount of memory in bytes allocated for the opcode cache o memory_free - amount of free memory in bytes available for the opcode cache o num_used_blks - number of memory blocks used by the opcode cache o num_free_blks - number of free memory blocks available for the opcode cache o memory_overhead - amount of memory in bytes used for the opcode cache internal structures EXAMPLES
Example #1 A wincache_ocache_meminfo(3) example <pre> <?php print_r(wincache_ocache_meminfo()); ?> </pre> The above example will output: Array ( [memory_total] => 134217728 [memory_free] => 112106972 [num_used_blks] => 15469 [num_free_blks] => 4 [memory_overhead] => 247600 ) SEE ALSO
wincache_fcache_fileinfo(3), wincache_fcache_meminfo(3), wincache_ocache_fileinfo(3), wincache_rplist_fileinfo(3), wincache_rplist_mem- info(3), wincache_refresh_if_changed(3), wincache_ucache_meminfo(3), wincache_ucache_info(3), wincache_scache_info(3), wincache_scache_mem- info(3). PHP Documentation Group WINCACHE_OCACHE_MEMINFO(3)
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