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Re: Performance tweaks

From: Alan Stange <stange(at)rentec(dot)com>
To: Oliver Jowett <oliver(at)opencloud(dot)com>
Cc: Ken Geis <kgeis(at)speakeasy(dot)net>, pgsql-jdbc(at)postgresql(dot)org
Subject: Re: Performance tweaks
Date: 2005-02-22 21:48:57
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Lists: pgsql-jdbc
Oliver Jowett wrote:

> Ken Geis wrote:
>> I changed the line
>>         byte[][] answer = new byte[l_nf][0];
>> to
>>         byte[][] answer = new byte[l_nf][];
>> This gave ~1% increase on the benchmark I was running.
> Gah?! What JVM? Aren't the two forms equivalent?

No.  They aren't.

The first is l_nf+1 objects being created (and array of byte[] with l_nf 
byte[0] entries) and the second is just a single object (an array of 
byte[], with null entries).

Any JVM.  It's the language definition.

-- Alan

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