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Full Discussion: Linux server is slow
Top Forums UNIX for Advanced & Expert Users Linux server is slow Post 302242733 by govindts on Thursday 2nd of October 2008 04:14:03 PM
Old 10-02-2008
Linux server is slow

Hello,

I am using Redhat redhat 4 update 4 kernal 2.6. My server is some time suddenly running slow.
The averge cpu load goes up to 50 to 60. (There is only two CPU and usually, the averge load
is between 1 to 2.5) That time, i see, there are several sessions connected.
Normally, we have 150 to 160 session. But when the server is slow, the total number of sessions
goes up to 400. At that time, it is taking long time to connect into the database. Even,
connecting into linux box is taking long time.

Our application server is showing this error message in log file.

ERROR] [2008-10-02 13:09:31] [JDBCExceptionReporter] The data source returned null from getConnection(user,password).
org.hibernate.exception.GenericJDBCException: Cannot open connection

Any one is phasing this problem??? Any direction to pursue this issue?
 

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SSL_CTX_flush_sessions(3)					      OpenSSL						 SSL_CTX_flush_sessions(3)

NAME
SSL_CTX_flush_sessions, SSL_flush_sessions - remove expired sessions SYNOPSIS
#include <openssl/ssl.h> void SSL_CTX_flush_sessions(SSL_CTX *ctx, long tm); void SSL_flush_sessions(SSL_CTX *ctx, long tm); DESCRIPTION
SSL_CTX_flush_sessions() causes a run through the session cache of ctx to remove sessions expired at time tm. SSL_flush_sessions() is a synonym for SSL_CTX_flush_sessions(). NOTES
If enabled, the internal session cache will collect all sessions established up to the specified maximum number (see SSL_CTX_sess_set_cache_size()). As sessions will not be reused ones they are expired, they should be removed from the cache to save resources. This can either be done automatically whenever 255 new sessions were established (see SSL_CTX_set_session_cache_mode(3)) or manually by calling SSL_CTX_flush_sessions(). The parameter tm specifies the time which should be used for the expiration test, in most cases the actual time given by time(0) will be used. SSL_CTX_flush_sessions() will only check sessions stored in the internal cache. When a session is found and removed, the remove_session_cb is however called to synchronize with the external cache (see SSL_CTX_sess_set_get_cb(3)). RETURN VALUES
SEE ALSO
ssl(3), SSL_CTX_set_session_cache_mode(3), SSL_CTX_set_timeout(3), SSL_CTX_sess_set_get_cb(3) 1.0.1e 2013-02-11 SSL_CTX_flush_sessions(3)
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