Thomas P Posted June 6, 2018 Posted June 6, 2018 Hi IPS buddies, how many keys are used by average on Redis on your forums? I ask because on our environment only about 180 to 190 keys are used during the day, this looks a bit sparse to me. WordPress for example uses by far more keys... Thanks, Thomas
Thomas P Posted June 10, 2018 Author Posted June 10, 2018 Hey folks, I am not sure if this is a decent amount of keys or if something is going wacky. So if anyone who is using Redis could please check really quick his numbers please, if would be very thankful. Thanks, Thomas
jair101 Posted June 10, 2018 Posted June 10, 2018 This is from my stats, I don't know if it is good either: # Keyspace db0:keys=633,expires=633,avg_ttl=13932494 I asked many times if people would share advice or their config, but without much luck. I guess most people simply enable it, without care to fine tune it at all. Anyway, here is the full output from redis-cli info on my server: redis-cli info # Server redis_version:4.0.9 redis_git_sha1:00000000 redis_git_dirty:0 redis_build_id:8e246a05989e6d22 redis_mode:standalone os:Linux 2.6.32-042stab127.2 x86_64 arch_bits:64 multiplexing_api:epoll atomicvar_api:atomic-builtin gcc_version:4.8.5 process_id:6321 run_id:48a8a1288bf42b8965ce32c2676d87fbb432a295 tcp_port:6379 uptime_in_seconds:1279121 uptime_in_days:14 hz:10 lru_clock:1909884 executable:/usr/bin/redis-server config_file:/etc/redis.conf # Clients connected_clients:1 client_longest_output_list:0 client_biggest_input_buf:0 blocked_clients:0 # Memory used_memory:17348864 used_memory_human:16.55M used_memory_rss:22564864 used_memory_rss_human:21.52M used_memory_peak:209709656 used_memory_peak_human:199.99M used_memory_peak_perc:8.27% used_memory_overhead:905430 used_memory_startup:782520 used_memory_dataset:16443434 used_memory_dataset_perc:99.26% total_system_memory:6442450944 total_system_memory_human:6.00G used_memory_lua:37888 used_memory_lua_human:37.00K maxmemory:209715200 maxmemory_human:200.00M maxmemory_policy:allkeys-lru mem_fragmentation_ratio:1.30 mem_allocator:jemalloc-3.6.0 active_defrag_running:0 lazyfree_pending_objects:0 # Persistence loading:0 rdb_changes_since_last_save:3113 rdb_bgsave_in_progress:0 rdb_last_save_time:1528636376 rdb_last_bgsave_status:ok rdb_last_bgsave_time_sec:1 rdb_current_bgsave_time_sec:-1 rdb_last_cow_size:3608576 aof_enabled:0 aof_rewrite_in_progress:0 aof_rewrite_scheduled:0 aof_last_rewrite_time_sec:-1 aof_current_rewrite_time_sec:-1 aof_last_bgrewrite_status:ok aof_last_write_status:ok aof_last_cow_size:0 # Stats total_connections_received:1473435 total_commands_processed:51829601 instantaneous_ops_per_sec:0 total_net_input_bytes:58644875206 total_net_output_bytes:1198627303788 instantaneous_input_kbps:0.00 instantaneous_output_kbps:0.00 rejected_connections:0 sync_full:0 sync_partial_ok:0 sync_partial_err:0 expired_keys:409791 expired_stale_perc:0.18 expired_time_cap_reached_count:0 evicted_keys:1571 keyspace_hits:73762530 keyspace_misses:1485737 pubsub_channels:0 pubsub_patterns:0 latest_fork_usec:908 migrate_cached_sockets:0 slave_expires_tracked_keys:0 active_defrag_hits:0 active_defrag_misses:0 active_defrag_key_hits:0 active_defrag_key_misses:0 # Replication role:master connected_slaves:0 master_replid:c242a97523990d983e7c2b19e81266560dbf19b4 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:0 second_repl_offset:-1 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0 # CPU used_cpu_sys:1961.74 used_cpu_user:1443.72 used_cpu_sys_children:225.97 used_cpu_user_children:1536.40 # Cluster cluster_enabled:0 # Keyspace db0:keys=633,expires=633,avg_ttl=13932494
Thomas P Posted June 10, 2018 Author Posted June 10, 2018 Thank you. Here is my info: Quote # Keyspace db0:keys=159,expires=148,avg_ttl=23801909 Quote # Server redis_version:4.0.8 redis_git_sha1:00000000 redis_git_dirty:0 redis_build_id:d2758f24a3500f1a redis_mode:standalone os:Linux 3.2.60-grsec-x86_64 x86_64 arch_bits:32 multiplexing_api:epoll atomicvar_api:atomic-builtin gcc_version:5.4.0 process_id:10145 run_id:ddc6c979ff2c6cc03329122b770d919eb9e9d0e8 tcp_port:6379 uptime_in_seconds:6898138 uptime_in_days:79 hz:10 lru_clock:1921292 executable:/(...)/redis-4.0.8/bin/./redis-server config_file:/(...)/redis-4.0.8/redis.conf # Clients connected_clients:1 client_longest_output_list:0 client_biggest_input_buf:0 blocked_clients:0 # Memory used_memory:10616456 used_memory_human:10.12M used_memory_rss:13889536 used_memory_rss_human:13.25M used_memory_peak:75745536 used_memory_peak_human:72.24M used_memory_peak_perc:14.02% used_memory_overhead:452806 used_memory_startup:392384 used_memory_dataset:10163650 used_memory_dataset_perc:99.41% total_system_memory:3694194688 total_system_memory_human:3.44G used_memory_lua:54272 used_memory_lua_human:53.00K maxmemory:3221225472 maxmemory_human:3.00G maxmemory_policy:noeviction mem_fragmentation_ratio:1.31 mem_allocator:jemalloc-4.0.3 active_defrag_running:0 lazyfree_pending_objects:0 # Persistence loading:0 rdb_changes_since_last_save:134 rdb_bgsave_in_progress:0 rdb_last_save_time:1528647788 rdb_last_bgsave_status:ok rdb_last_bgsave_time_sec:0 rdb_current_bgsave_time_sec:-1 rdb_last_cow_size:0 aof_enabled:0 aof_rewrite_in_progress:0 aof_rewrite_scheduled:0 aof_last_rewrite_time_sec:-1 aof_current_rewrite_time_sec:-1 aof_last_bgrewrite_status:ok aof_last_write_status:ok aof_last_cow_size:0 # Stats total_connections_received:19952765 total_commands_processed:442439004 instantaneous_ops_per_sec:33 total_net_input_bytes:795170300069 total_net_output_bytes:10216739360413 instantaneous_input_kbps:43.34 instantaneous_output_kbps:875.56 rejected_connections:0 sync_full:0 sync_partial_ok:0 sync_partial_err:0 expired_keys:5689718 evicted_keys:0 keyspace_hits:404401432 keyspace_misses:12083007 pubsub_channels:0 pubsub_patterns:0 latest_fork_usec:391 migrate_cached_sockets:0 slave_expires_tracked_keys:0 active_defrag_hits:0 active_defrag_misses:0 active_defrag_key_hits:0 active_defrag_key_misses:0 # Replication role:master connected_slaves:0 master_replid:1a37b64e70d4601c2ea614d7eeb18c7a3b42a9db master_replid2:0000000000000000000000000000000000000000 master_repl_offset:0 second_repl_offset:-1 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0 # CPU used_cpu_sys:26814.26 used_cpu_user:11677.11 used_cpu_sys_children:314.55 used_cpu_user_children:2051.99 # Cluster cluster_enabled:0 Now the feeling that something doesn't work ideally on my setup is becoming clear... Thanks, Thomas
Thomas P Posted June 14, 2018 Author Posted June 14, 2018 Hi, I switched to Memcached to check what I see there. Using Memcached shows me 350-370 keys hold in the cache... -> I really wonder why there are such differences in using caches for different installations and different cache mechanisms.
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