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Operating Systems HP-UX Performance problem - waiting on cache Post 302489772 by Perderabo on Friday 21st of January 2011 02:28:08 PM
Old 01-21-2011
32 GB is a much better figure but still a bit low for 8 cpus. And I still say memory is the problem. How much of that is devoted to Oracle's shared memory segments? ipcs -mb should show that.

To read data from a filesystem the data is loaded into cache (unless it's already there) and then delivered to the process. If cache is full a cache buffer must be freed. Once the buffer is free the read can continue. When you write to a file you change the data in a cache buffer. The buffer is said to be "dirty". A dirty buffer must be written to disk before it can be freed. You need more cache buffers and this probably means more memory.

Locking cache at 10% is probably not a great idea. I would try min at 10% and max at 20%. The would give the kernel some more freedom in managing what memory it has.
 

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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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