Re: [HACKERS] [POC] Faster processing at Gather node

Hi Rafia,

I like the idea of reducing locking overhead by sending tuples in bulk. 
The implementation could probably be simpler: you could extend the API 
of shm_mq to decouple notifying the sender from actually putting data 
into the queue (i.e., make shm_mq_notify_receiver public and make a 
variant of shm_mq_sendv that doesn't send the notification). From Amit's 
letter I understand that you have already tried something along these 
lines and the performance wasn't good. What was the bottleneck then? If 
it's the locking around mq_bytes_read/written, it can be rewritten with 
atomics. I think it would be great to try this approach because it 
doesn't add much code, doesn't add any additional copying and improves 
shm_mq performance in general.

-- 
Alexander Kuzmenkov
Postgres Professional:http://www.postgrespro.com
The Russian Postgres Company



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