title: postgres corrupted shared memory
body: <p>i am trying to use postgresql to process queries on GPU using PG_strom.
  whenever i try to process queries i got issue:</p>
  <pre><code>postmaster has commanded this server process to roll back the current
  transaction and exit, because another 
  server process exited abnormally and possibly corrupted shared memory.
  </code></pre>
  <p>i have checked that i have to increase shared buffer and work memory these are my current configuartions:</p>
  <pre><code>shared_buffers = 10GB
  work_mem = 1GB
  </code></pre>
  <p>i want to know how can i increase them to its maximum limit as whenever i try to increase them i couldn't connect to postgresql.</p>