As Visvanath points out memory usage for those total of 150 users is critical. On our Windows server, each apache thread uses 100K (as shown in task manager), so look carefully at the total RAM that is available. One thought about the db connection error: what is the value of MAX_CONNECTIONS in your postgresql.conf file? I'm thinking that this could be the limiting factor.
Hardware and performance
Got db connection error when user connection up to 150
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