Faster (batch) insert

[Vanuan]

Investigate why does it take so long to insert data.

[Vanuan]

Use redis for socket session: 7f37f81
Prevent crashes: 9218f50
Use redis for http session: 64bf818

[Vanuan]

Additionally, add these lines to /etc/rc.local

echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag

[Vanuan]

** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
**        We suggest setting it to 'never'
** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
**        We suggest setting it to 'never'

[Vanuan]

edr_1           | FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory
edr_1           | Aborted (core dumped)
edr_edr_1 exited with code 134

[Vanuan]

  File "<string>", line 3, in <module>
  File "compose/cli/main.py", line 57, in main
  File "compose/cli/main.py", line 108, in perform_command
  File "compose/cli/main.py", line 741, in up
  File "compose/cli/log_printer.py", line 86, in run
  File "compose/cli/log_printer.py", line 222, in consume_queue
MemoryError
docker-compose returned -1

[Vanuan]

https://www.npmjs.com/package/ofe

[Vanuan]

# WARNING overcommit_memory is set to 0!
Background save may fail under low memory condition.
To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf
and then reboot or run the command 'sysctl vm.overcommit_memory=1'
for this to take effect.