Обсуждение: Direct I/O
I am running PostgreSQL 8.3.9 on Red Hat 4.4 with only 4GB of memory. I would like to increase buffers but the problem is that I don't see much free memory. There is quite a large consumption of FS buffers:
total used free shared buffers cached
Mem: 4148528 3924496 224032 0 11912 3792940
-/+ buffers/cache: 119644 4028884
Swap: 8385920 997620 7388300
Now, in the world of Oracle, I would direct Oracle RDBMS to use direct I/O and avoid double buffering altogether. Is there something similar for PostgreSQL? In other words, may I somehow instruct PostgreSQL to use direct I/O and/or asynchronous I/O?
total used free shared buffers cached
Mem: 4148528 3924496 224032 0 11912 3792940
-/+ buffers/cache: 119644 4028884
Swap: 8385920 997620 7388300
Now, in the world of Oracle, I would direct Oracle RDBMS to use direct I/O and avoid double buffering altogether. Is there something similar for PostgreSQL? In other words, may I somehow instruct PostgreSQL to use direct I/O and/or asynchronous I/O?
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