Hi, we are trying to implement better memcached monitoring and have come across this problem with 1.4.5:
- after flush_all on a filled (long-running) memcached, we get evictions immediately (within seconds, none of the buckets should fill up that quickly) This would mean that either flushed items count toward evictions when replaced (even though they should not be valid items after flush_all and evictions should count only valid items that were replaced) or that somehow flush_all does not work as expected, or that we have a pathetically bad distribution of item sizes and memcached will not reallocate slabs/buckets after a flush_all(?). If this behaviour is normal, does anyone have a better suggestion regarding what to monitor other than evictions to see if more memcached instances would be needed? Memcached options were: memcached -v -m 2000 -l 10.0.0.22 -p 11211 -u root stats items reports evictions (shortly after flushing) in 2 buckets: STAT items:5:number 8737 STAT items:5:age 24656 STAT items:5:evicted 16 STAT items:5:evicted_nonzero 0 STAT items:5:evicted_time 130774 STAT items:5:outofmemory 0 STAT items:5:tailrepairs 0 STAT items:5:reclaimed 6 STAT items:19:number 8832 STAT items:19:age 141322 STAT items:19:evicted 45 STAT items:19:evicted_nonzero 45 STAT items:19:evicted_time 14103 STAT items:19:outofmemory 0 STAT items:19:tailrepairs 0 STAT items:19:reclaimed 8 stats slabs: STAT 5:chunk_size 240 STAT 5:chunks_per_page 4369 STAT 5:total_pages 2 STAT 5:total_chunks 8738 STAT 5:used_chunks 8738 STAT 5:free_chunks 0 STAT 5:free_chunks_end 0 STAT 5:mem_requested 1826616 STAT 5:get_hits 0 STAT 5:cmd_set 226 STAT 5:delete_hits 0 STAT 5:incr_hits 0 STAT 5:decr_hits 0 STAT 5:cas_hits 0 STAT 5:cas_badval 0 STAT 19:chunk_size 5680 STAT 19:chunks_per_page 184 STAT 19:total_pages 48 STAT 19:total_chunks 8832 STAT 19:used_chunks 8832 STAT 19:free_chunks 0 STAT 19:free_chunks_end 0 STAT 19:mem_requested 42671558 STAT 19:get_hits 17 STAT 19:cmd_set 217 STAT 19:delete_hits 0 STAT 19:incr_hits 0 STAT 19:decr_hits 0 STAT 19:cas_hits 0 STAT 19:cas_badval 0 Thanks, Marinos
