Re: JIT overhead slowdown

2019-01-18 Thread Andres Freund 
Hi,

On 2019-01-18 14:12:23 +, Luis Carril wrote:
> Is this behavior expected? Is the cost function for jitting missing some 
> circumstances?

The costing doesn't take the effect of overhead of repeated JITing in
each worker into account.  I could give you a test patch that does, if
you want to play around with it?

Greetings,

Andres Freund

Re: JIT overhead slowdown

2019-01-18 Thread Luis Carril 
Hi Andres,

   yes please it would be much apreciated. Would it not be possible to share 
the jitted program across the workers?


Cheers,
Luis


Dr. Luis M. Carril Rodríguez
Senior Software Engineer
[email protected]

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[cid:01158560-9a6f-4435-8170-02d99a0c9cd0]

From: Andres Freund 
Sent: Friday, January 18, 2019 5:42:54 PM
To: Luis Carril
Cc: [email protected]
Subject: Re: JIT overhead slowdown

Hi,

On 2019-01-18 14:12:23 +, Luis Carril wrote:
> Is this behavior expected? Is the cost function for jitting missing some 
> circumstances?

The costing doesn't take the effect of overhead of repeated JITing in
each worker into account.  I could give you a test patch that does, if
you want to play around with it?

Greetings,

Andres Freund