--cache_size=1000000 from the command line (or configuration file).
default is cache_size=0 which means no limit
The limit is a little squishy, no more items can be added once the cache is exceeded.
Some permanent items, like barometer parameters don't cound against the cache (but should be small).
The cache limit doesn't propogate, you can have
owserver --cache_size=9999
owfs --cache_size=1000 --autoserver
and owfs might overflow while owserver ca nstill accept items.
Note that the cache degrades cleanly. Once the size is exceeded, the program will continue to function, just not add items to the cache.
Paul Alfille
On 10/16/06, Roberto Spadim <[EMAIL PROTECTED]> wrote:
can we set max cache size? like 1mb of cache?
Roberto Spadim escreveu:
>today implementation don't have problems!
>
>maybe an new directory could help, see:
>
>when we get from "/#OW SYSTEM#/#ANY FILE OR DIRECTORY#" (could be
>"/ow_device_manager/#ANY FILE OR DIRECTORY#")
>OW SYSTEM:
> ow system that's connected direct to ds2480 or ds2490 or another
>dsxxxx
>
>this directory could work like this:
>
>init(" owserver ");
>get(" settings values ");
>put("/settings/timeout/network",0);
>put("/settings/timeout/stable",0);
>put("/settings/timeout/volatile",0);
>put("/settings/timeout/ another timeout configurations ",0);
>$value=get(" getting now will be expired cache value, we will get from
>owserver :) ");
>put(" set settings back again ",setting_value);
>echo "$value";
>
>i can do it with php, but time to change and set again configuration is
>very big for a single read.
>
>*****************
>cache system ideas:
>
>SQLITE
>sqlite good things:
>we can SEE the cache
>
>good thinks about sqlite library (www.sqlite.org):
>Small code footprint: less than 250KiB fully configured or less than 150KiB
>with optional features omitted.
>Supports databases up to 2 terabytes (241 bytes) in size. (no problem with
>264 device)
>A complete database is stored in a single disk file.
>Implements most of SQL92.
>Zero-configuration - no setup or administration needed.
>Self-contained: *no external* dependencies.
>
>
>*have windows and posix support!!!!*
>
>SQLITE PROBLEMS:
> maybe anyone could delete file or change table values or put incorrect
>values on cache system, write lock on file must be done
> if sqlite is used with ":memory:" (in memory database) just owserver
>will see the database, may be it could be used only with filesystem cache
>
>if sqlite is faster than today implementation AND with small footprint, we
>could change today implementation for non uclinux compilations too, we need
>to see if memory usage is bigger or small with sqlite library too
>
>we don't need to delete expirate values, a field could say the last time
>that cache was updated and an SQL statment could filter the value like:
>"SELECT value FROM cache_table WHERE file='balbalbal' AND expiration_time>=
>current_time ", maybe when owserver end or start database could be
>cleaned...
>
>
>ANOTHERS
>
>anothers cache systems could be: the system used in MMTurck or eaccelerator
>or APC or memcache (php libraries from pecl.php.net) or Berkeley DB or
>(http://www.danga.com/memcached/) :
>Memcached is a caching daemon designed especially for dynamic web
>applications to decrease database load by storing objects in memory.
>MEMCACHE PROBLEMS:
> server must run before ow,
> could be used for non uclinux too,
> maybe sqlite could be faster, if disk write and read is faster than IP
>communication.
> If memcache server die or don't work what could we do?
> i didn't see documentation of memcache, but i think that we can't see
>all cache contents like an "SELECT * FROM cache_table"
>
>COMMENTS:
>
>i don't know if database systems could help, we need fast systems and i
>don't like another program running like mysqld or oracle daemon or
>postgrees daemon or firebird daemon or XXX daemon, maybe embbeded solutions
>like sqlite or filebased databases could help. without server running cache
>is locked, using filebased database we just need file access to write and
>read, today i just run owserver with root... i don't have privileges
>problems for files, for windows the same thing just run like administrator
>if we will use filebased, we need to remember that files can be shared...
>if we put it on network filesystems maybe many owserver can use the
>samefile and table conflicts could occur like duplicated settings values,
>we need to put mac address to know what server we are, or another unique
>ID...
>just building to test and know if it really work...
>
>
>Paul Alfille escreveu:
>
>>Hi Robero. You certainly are exploring the entire program!
>>
>>Currently the cache is an in-memory binary tree. There is some information
>>at http://www.owfs.org/index.php?page=cache
>><http://www.owfs.org/index.php?page=cache >
>>
>>Several different things are cached:
>>1. devices (basically if a serial number was found, and on which bus)
>>2. directory lists (lists of serial numbers for a given path)
>>3. "file" contents ( things like serialnumber/temperature )
>>4. Hidden properties (like cumulative counters, and barometer calibration
>>factors)
>>
>>Cached items also store their termination time.
>>
>>We actually use two binary trees, one for new entries, and one that is
>>older. The older one doesn't get updated, and eventually expires entirely,
>>and gets deleted. At that point, the newer one becomes the older one, and
>>a new one is started.
>>
>>This means that we never have to scan through all the items with see which
>>are too old, and stale entries are guarnteed to be deleted in a reasonable
>>time period.
>>
>>So, could the cache be stored in SQLite? Sure. Could it be backed up by a
>>physical file? Sure. What would the advantage be? Binary trees are quite
>>fast for adding and retrieving. Glibc and uClibc both have support built
>>in for binary trees so external libraries are needed.
>>
>>There are some problems with the current scheme. If you have owfs
>>connecting to owserver, each has it's own cache. It is possible for the
>>caches to be out of synch, especially if several programs are connected to
>>owserver. Reading "uncached" values will always work, and cache problems
>>time themselves out quickly in any case.
>>
>>An alternative design would be a separate owcache program. Cache would be
>>consistent, and not repeated, but communication efficiency might swamp
>>space efficiency. I didn't do it because of the complexity.
>>
>>Tell me what you see as the deficiencies of the current scheme.
>>
>>Paul Alfille
>>
>>On 10/14/06, *Roberto Spadim* <[EMAIL PROTECTED]
>><mailto:[EMAIL PROTECTED]>> wrote:
>>
>> Hello guys, i was thinking about cache system...
>> can we use cache in filesystem?
>> like in sqlite we can use
>> sqlite_open(":memory:");
>> to use database on memory and
>> sqlite_open("/file.sqlite");
>> to open an file
>> could we set the "file_name" of cache system?
>> if we put "NULL" the cache system could be turned off
>> what you say?
>>
>> have anyother database system that is fast than today database?
>> sqlite
>> could be used? we are using berkley?
>> could we select "file_name" for
>> Old Cache data
>> New Cache data
>> Persistent data
>>
>> in diferent "files"??
>> thankx guys :)
>>
>> "files" could be memory or real file
>>
>>
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