02-13-2020
I have seen cases like that when you have enormous disc cache synchronising... all is fine when pure transactional mode ( the periodic sync has hmmm "little" to update ) but when it comes to batches running, it fills the cache before periodic sync and then the system has to wait the end of forced sync (file cache OS side...)
Other contention possible big file cache with big SGA: parsing both and not finding reduces perfs...
Last edited by vbe; 02-13-2020 at 04:07 AM..
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LEARN ABOUT DEBIAN
alzabo::runtime::uniquerowcache
Alzabo::Runtime::UniqueRowCache(3pm) User Contributed Perl Documentation Alzabo::Runtime::UniqueRowCache(3pm)
NAME
Alzabo::Runtime::UniqueRowCache - Implements a row cache for Alzabo
SYNOPSIS
use Alzabo::Runtime::UniqueRowCache;
Alzabo::Runtime::UniqueRowCache->clear();
DESCRIPTION
This is a very simple caching mechanism for "Alzabo::Runtime::Row" objects that tries to ensure that for there is never more than one row
object in memory for a given database row.
To use it, simply load it.
It can be foiled through the use of "Storable" or other "deep magic" cloning code, like in the "Clone" module.
The cache is a simple hash kept in memory. If you use this module, you are responsible for clearing the cache as needed. The only time it
is cleared automatically is when a table update or delete is performed, in which case all cached rows for that table are cleared.
In a persistent environment like mod_perl, you should clear the cache on a regular basis in order to prevent the cache from getting out of
sync with the database. A good way to do this is to clear it at the start of every request.
METHODS
All methods provided are class methods.
* clear
This clears the entire cache
* clear_table( $table_object )
Given a table object, this method clears all the cached rows from that table.
* row_in_cache( $table_name, $row_id )
Given a table name and a row id, as returned by the "Alzabo::Runtime::Row->id_as_string" method, this method returns the matching row
from the cache, if it exists. Otherwise it returns undef.
* delete_from_cache( $table_name, $row_id )
Given a table name and a row id, as returned by the "Alzabo::Runtime::Row->id_as_string" method, this method returns the matching row
from the cache.
* write_to_cache( $row_object )
Given a row object, this method stores it in the cache.
AVOIDING THE CACHE
If you want to not cache a row, then you can pass the "no_cache" parameter to any table or schema method that creates a new row object or a
cursor, such as "Alzabo::Runtime::Table->insert()", "Alzabo::Runtime::Table->rows_where()".
AUTHOR
Dave Rolsky, <autarch@urth.org>
perl v5.8.8 2007-12-23 Alzabo::Runtime::UniqueRowCache(3pm)