I remember an old issue I had with postgres and shared memory being set too low by the distro I was using. What's the value of "/proc/sys/kernel/shmmax"? Try setting to 18446744073709551615 Regards, Alvaro Aguayo Operations Manager Open Comb Systems E.I.R.L. Office: (+51-1) 3377813 | Mobile: (+51) 995540103 | (+51) 954183248 Web: www.ocs.pe ----- Original Message ----- From: "Arjun Ranade" <ranade@xxxxxxxxxxxxxxxxx> To: "pgsql-admin" <pgsql-admin@xxxxxxxxxxxxxx> Sent: Tuesday, 14 November, 2017 14:44:08 Subject: PG10 - Out of shared memory / invalid memory alloc request size We recently upgraded a database that a number of developers use from Postgres 9.4 to 10. Our memory parameters are unchanged. We are seeing a lot of errors that look like this in the postgres log: < 2017-11-14 13:13:59 EST [144172] : [1-1] user=[unknown],db=qa16,remote=192.168.104.22(35238) > FATAL: no PostgreSQL user name specified in startup packet < 2017-11-14 13:52:22 EST [6273] : [1-1] user=deployment_app,db=qa5,remote=192.168.104.83(45384) > ERROR: out of shared memory < 2017-11-14 14:17:53 EST [6200] : [3-1] user=service_tracker_app,db=qa16,remote=192.168.104.22(46996) > ERROR: invalid memory alloc request size 34359738368 Anecdotally it seems that these errors are happening when powa_take_snapshot() (Postgres workload analyzer) is running as well but I can't confirm that. Does anyone know how to debug these types of errors? And once the db is in this state, how do we resolve sessions reporting "Error: invalid memory alloc request size" - killing the sessions and having them reconnect does not fix the issue. Thanks, Arjun -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
