-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Gaute Amundsen wrote:
Hi
What's the difference between the to cache-size settings here? I've not been able to find a good description to guide me in finding the right values.
<zodb_db main> mount-point / cache-size 10000 1. <zeoclient> server foo:9080 storage main name zeostorage var $INSTANCE/var cache-size 20MB 2. </zeoclient> </zodb_db>
As far as I've been able to determine, the second one 2. refers to a separate cache at the zeo connection level.
The ZEO client cache is a disk-based cache, separate from the RAM-based cache used by any ZODB connection. It doesn't use RAM, per se, except for an in-memory index of OID -> (layer, offset).
Running 9 zeo clients (2.7.9) like this on a frontend with 4G ram, varnish, apache, and haproxy. Tethering on the edge of too much swapping. Needing to cut down..
Assuming you are running with the default number of "worker threads" (4): 10000 objects in the cache * 4 active connections per appserver * 9 appservers means you are caching 360,000 objects in RAM. If they are putting you into swap, then you are averaging something like 10Kb per object, which is pretty big.
Would it be better to spend all the memory on 1? Is there a good way to find a balance?
I think I might cut down on the number of appservers on that host, if it truly is hitting swap. Or trim the number of threads per appserver down from 4 to 2 or 3. Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tseaver@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAktEUIQACgkQ+gerLs4ltQ6pYwCfX4g/ZVfAnyJNQ4Y1njnSx1HV 6QEAnAg/UHsCEQSx6rUpj5K9X2JkoGdQ =7ya0 -----END PGP SIGNATURE-----