Sorry for the bandwidth, this is a repeat send from January.We STILL have this issue. Perhaps a new look might jolt your memory and help me resolve this issue!!!
Problem: Apache server will stay up for random amount of time, usually days, but eventually enters a hung state. When hung the CPU load gradually spikes on the machine and new web server requests are unresponsive. Only a full server stop/kill and restart will resolve the issue, at which time the host load average drops quickly to normal. Error logs typically contain many many lines of: Wed Jan 28 16:06:58.667188 2015] [mpm_event:error] [pid 25336:tid 1] AH00485: scoreboard is full, not at MaxRequestWorkers I have done a lot of web research on this top and have found many cases where others have had the same/similar issue but no real solutions. Seem very close to this bug report: https://issues.apache.org/bugzilla/show_bug.cgi?id=53555 Environment: LDOM (VM) SunOS myhostname 5.10 Generic_118833-36 sun4v sparc SUNW,Sun-Fire-T200 8G RAM http Conf: StartServers 8 MinSpareServers Not set MaxSpareServers Not set ServerLimit 256 MaxRequestWorkers 200 MaxConnectionsPerChild 200 KeepAlive On TimeOut 3000 MaxKeepAliveRequests 50 KeepAliveTimeout 2RequestReadTimeout header=10-20,MinRate=500 body=20,MinRate=500 We use LDAP to authenitcate most of our web tools, and this is configured like: # # Enable the LDAP connection pool and shared # memory cache. Enable the LDAP cache status # handler. Requires that mod_ldap and mod_authnz_ldap be loaded. # LDAPSharedCacheSize 500000 LDAPCacheEntries 1024 LDAPCacheTTL 600 LDAPOpCacheEntries 1024 LDAPOpCacheTTL 600 Current non-hung Score Board: Apache Server Status for myserver.domain (via 5.5.5.5) - Server Version: Apache/2.4.12 (Unix) - Server MPM: event - Server Built: Feb 20 2015 13:47:55 - Current Time: Monday, 01-Jun-2015 16:52:14 PDT - Restart Time: Monday, 01-Jun-2015 00:35:23 PDT - Parent Server Config. Generation: 1 - Parent Server MPM Generation: 0 - Server uptime: 16 hours 16 minutes 51 seconds - Server load: 1.06 0.84 0.60 - Total accesses: 8263 - Total Traffic: 414.7 MB - CPU Usage: u20.9 s32 cu660.69 cs121.41 - 1.42% CPU load - .141 requests/sec - 7.2 kB/second - 51.4 kB/request - 2 requests currently being processed, 98 idle workers | PID | Connections | Threads | Async connections | | total | accepting | busy | idle | writing | keep-alive | closing | | 18793 | 0 | yes | 0 | 25 | 0 | 0 | 0 | | 9525 | 3 | yes | 1 | 24 | 0 | 0 | 3 | | 13484 | 0 | yes | 0 | 25 | 0 | 0 | 0 | | 19506 | 3 | yes | 1 | 24 | 0 | 0 | 2 | | Sum | 6 | | 2 | 98 | 0 | 0 | 5 | ........................._______________________________________ ________W__________________________________W_________________... ................................................................ ........ Any thoughts/comments on http conf tuning, OS patches, apache bug fixes appreciated. This is a production server, so you can imagine, having it go down at random times (usually when I am asleep) is not fun! Thanks. MJ
