I am sorry, I posted too early.
I think I am getting somewhere, but not quite there yet.
This is the contents of /var/lib/imap/db/DB_CONFIG
set_cachesize 2 0 8 set_lg_regionmax 268435456 set_lg_bsize 67108864 set_flags DB_TXN_WRITE_NOSYNC
IOW, I am going for
-- cachesize of 2 GB in 8 buckets. -- regionmax of 256 MB -- bsize of 64 MB
I have 8 GB RAM on this machine, I want to have /large/ allowances for BDB --just to be on the safe side.
Trouble is, I have no idea what /safe side/ means in this context.
What complicates the issue more is the result of 'db_stat -m', which reads as below. Now, where is my 2GB cache?
259KB 896B Total cache size (266112 bytes). 1 Number of caches. 270336 Pool individual cache size. 52664 Requested pages found in the cache (100%). 0 Requested pages mapped into the process' address space. 229 Requested pages not found in the cache. 0 Pages created in the cache. 229 Pages read into the cache. 259 Pages written from the cache to the backing file. 2 Clean pages forced from the cache. 166 Dirty pages forced from the cache. 0 Dirty buffers written by trickle-sync thread. 63 Current clean buffer count. 0 Current dirty buffer count. 67 Number of hash buckets used for page location. 52851 Total number of times hash chains searched for a page. 5 The longest hash chain searched for a page. 80851 Total number of hash buckets examined for page location. 119878 The number of region locks granted without waiting. 1 The number of region locks granted after waiting. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Pool File: /var/lib/imap/tls_sessions.db 4096 Page size. 44 Requested pages found in the cache (96%). 0 Requested pages mapped into the process' address space. 2 Requested pages not found in the cache. 0 Pages created in the cache. 2 Pages read into the cache. 9 Pages written from the cache to the backing file. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Pool File: /var/lib/imap/deliver.db 4096 Page size. 52620 Requested pages found in the cache (100%). 0 Requested pages mapped into the process' address space. 227 Requested pages not found in the cache. 0 Pages created in the cache. 227 Pages read into the cache. 250 Pages written from the cache to the backing file.
Cheers, Ray
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