在Ubuntu 14.04 x64服务器上,Haproxy使用3.3 GB内存和6.8 GB交换,同时处理52k连接.在大部分流量被重定向到另一个haproxy盒之前,cpu使用量也会持续增加到100％.流量主要是持久的TCP连接.
- pid = 3185 (process #1,nbproc = 1)
- uptime = 0d 6h14m21s
- system limits: memmax = unlimited; ulimit-n = 524341
- maxsock = 524341; maxconn = 262144; maxpipes = 0
- current conns = 54303; current pipes = 0/0
- Running tasks: 1/54336
人们注意到内存使用量大约在50k连接处大幅增加. ulimit -n设置为1048576.
问题：内存使用量是否异常高？我们怎样才能减少内存消耗？
我还从另一个问题中读到以下内容,是否相关？我应该如何检查TCP设置是否足够(对于持久性TCP连接),以免导致内存使用量的大幅增加？
- At 54000 concurrent connections,you should be careful about your TCP settings. If running with default settings (87kB read buffer,16kB write buffer),you can end up eating 10 gigs of memory just for the sockets.
sysctl.conf的
- net.core.wmem_max=12582912
- net.core.rmem_max=12582912
- net.ipv4.tcp_rmem= 10240 87380 12582912
- net.ipv4.tcp_wmem= 10240 87380 12582912
haproxy.conf
- global
- log /dev/log local0
- log /dev/log local1 notice
- maxconn 262144
- chroot /var/lib/haproxy
- user haproxy
- group haproxy
- daemon
- defaults
- log global
- mode tcp
- option tcplog
- option dontlognull
- option redispatch
- retries 3
- maxconn 262144
- contimeout 180000
- clitimeout 180000
- srvtimeout 180000
- timeout contimeout 180000
- timeout connect 180000
- timeout client 180000
- timeout server 180000
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