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Full Discussion: ZFS Filesystem
Operating Systems Solaris ZFS Filesystem Post 302952973 by jlliagre on Monday 24th of August 2015 04:41:26 PM
Old 08-24-2015
Quote:
Originally Posted by Peasant
It is not unusual for ZFS to eat almost all available memory.
There is a lot of misunderstanding around this topic. All file systems will eat as much memory as they find useful, not just ZFS, unused memory being wasted memory anyway.

The big differences are:

- ZFS memory, including the ARC, is reported as used/unavailable while other file systems memory, the buffer cache and the page cache, is reported as free/available.

- ZFS memory is released asynchronously and gradually by observing RAM demand while other file system's memory is released synchronously and (almost) instantaneously. Where that matters is when an application requests a very large amount of non pageable memory as the allocation might fail. The arc_max tuning prevents ZFS to use all the RAM helping these allocations to succeed.
 

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WINCACHE_UCACHE_MEMINFO(3)						 1						WINCACHE_UCACHE_MEMINFO(3)

wincache_ucache_meminfo - Retrieves information about user cache memory usage

SYNOPSIS
array wincache_ucache_meminfo (void ) DESCRIPTION
Retrieves information about memory usage by user cache. RETURN VALUES
Array of meta data about user 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 user cache o memory_free - amount of free memory in bytes available for the user cache o num_used_blks - number of memory blocks used by the user cache o num_free_blks - number of free memory blocks available for the user cache o memory_overhead - amount of memory in bytes used for the user cache internal structures EXAMPLES
Example #1 A wincache_ucache_meminfo(3) example <pre> <?php print_r(wincache_ucache_meminfo()); ?> </pre> The above example will output: Array ( [memory_total] => 5242880 [memory_free] => 5215056 [num_used_blks] => 6 [num_free_blks] => 3 [memory_overhead] => 176 ) 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_info(3), wincache_scache_info(3), wincache_scache_meminfo(3). PHP Documentation Group WINCACHE_UCACHE_MEMINFO(3)
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