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Operating Systems Solaris Monitoring Paging and Swapping Post 303024786 by jlliagre on Tuesday 16th of October 2018 04:49:07 PM
Old 10-16-2018
Quote:
Originally Posted by javanoob
But how do I know if the amount of memory available and allocated to ZFS ARC is sufficient or not ?
Check the cache hit ratio to see how efficient it is. The closer to 100%, the better.

If you can fit all the files you use in RAM (hit rate 100%) and still have room enough for the applications and other consumers RAM usage, go for it and set the ZFS ARC size to be able to host everything.

On the opposite and more likely situation, that's a trade off and you should measure usage, do tests that last a few days or more, see how your RAM is used, see how performance is impacted by giving more memory to the cache or more memory to the applications, and act accordingly.

Last edited by jlliagre; 10-17-2018 at 04:18 AM..
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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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