笔者最近在使用Protostuff优化redis缓存部分,为了前后对比使用内存变化，于是使用期了命令。
1、登录服务器
/usr/bin/redis-cli -p 6379 -a redis密码
2、查看内存
info memory
其中used_memory是使用的内存，used_memory_human是便于阅读的数值（human参数类似于linux的h参数，方便人机阅读）。
当然用info命令也可以查看所有参数
127.0.0.1:9543> info # Server redis_version:3.2.12 redis_git_sha1:00000000 redis_git_dirty:0 redis_build_id:7897e7d0e13773f redis_mode:standalone os:Linux 4.19.0-6.el7.ucloud.x86_64 x86_64 arch_bits:64 multiplexing_api:epoll gcc_version:4.8.5 process_id:53065 run_id:9647503ba308d70c662154fd1f874fca2d7f861e tcp_port:9543 uptime_in_seconds:4241299 uptime_in_days:49 hz:10 lru_clock:16335376 executable:/usr/bin/redis-server config_file:/etc/redis.conf # Clients connected_clients:51 client_longest_output_list:0 client_biggest_input_buf:0 blocked_clients:0 # Memory used_memory:2552592 used_memory_human:2.43M used_memory_rss:9994240 used_memory_rss_human:9.53M used_memory_peak:2957584 used_memory_peak_human:2.82M total_system_memory:1919422464 total_system_memory_human:1.79G used_memory_lua:37888 used_memory_lua_human:37.00K maxmemory:0 maxmemory_human:0B maxmemory_policy:noeviction mem_fragmentation_ratio:3.92 mem_allocator:jemalloc-3.6.0 # Persistence loading:0 rdb_changes_since_last_save:6 rdb_bgsave_in_progress:0 rdb_last_save_time:1610170433 rdb_last_bgsave_status:ok rdb_last_bgsave_time_sec:0 rdb_current_bgsave_time_sec:-1 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 # Stats total_connections_received:1156 total_commands_processed:44870 instantaneous_ops_per_sec:0 total_net_input_bytes:28006092 total_net_output_bytes:134623051 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:3 evicted_keys:0 keyspace_hits:11414 keyspace_misses:1111 pubsub_channels:0 pubsub_patterns:1 latest_fork_usec:606 migrate_cached_sockets:0 # Replication role:master connected_slaves:0 master_repl_offset:0 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0 # CPU used_cpu_sys:2169.39 used_cpu_user:1198.49 used_cpu_sys_children:0.28 used_cpu_user_children:0.33 # Cluster cluster_enabled:0 # Keyspace db0:keys=52,expires=0,avg_ttl=0
就在笔者使用这个命令列举运行时状态信息后，发现connected_clients参数非常大，这台redis是外网的服务器。发现51个连接。
使用同样程序在内网跑，连接数只有15个，相差较多。按照网上进行优化
1、查看连接超时（0代表不超时）
config get timeout
2、设置超时参数
config set timeout 1000
永久生效办法，修改配置文件
vim /etc/redis.conf
修改timeout为1000
再次查询只有3个连接