Using memcached 1.4.15 Over the past few months I've been having a few issue with memcached, notably the issue here: http://code.google.com/p/memcached/issues/detail?id=260 However, another, maybe related issue, is that once every few days, clients (websites running PHP) cannot connect to the localhost memcached instance. I'm running with a connection limit of 4096: memcached -d -p 11211 -m 1024 -c 4096 -P /var/run/memcached/memcached.pid -l 127.0.0.1 -k When the error started happening today, I looked at the log and see several "Too many open connections" lines. Here's the first one: ... >4094 Writing bin response: ... <4094 connection closed. Too many open connections ... Connection #4094 is right around my 4096 connection limit... Looking at netstat and lsof, I see around 4000 connections -- most of them are in CLOSE_WAIT. lsof: ... memcached 477 root 1366u IPv4 622713568 0t0 TCP localhost:memcache->localhost:43324 (CLOSE_WAIT) memcached 477 root 1367u IPv4 622713571 0t0 TCP localhost:memcache->localhost:43325 (CLOSE_WAIT) ... netstat: ... tcp 39 0 localhost:memcache localhost:45768 CLOSE_WAIT tcp 25 0 localhost:memcache localhost:42766 CLOSE_WAIT ... The rest of the connections are in FIN_WAIT1, ESTABLISHED, etc, but the vast majority are the ~4,000 CLOSE_WAIT connections. I'm going to try bumping up the connection limit to 32k to avoid this for now, but clearly there's something going on where memcached isn't closing connections. How can I debug this further?
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