Re: Pl/Perl function: Speed of the First time executing pl/perl function in connection;

So, how i must optimize it?

2008/11/16 Andrew Dunstan <andrew@dunslane.net>:
>
>
> Tom Lane wrote:
>>
>> I wrote:
>>
>>>
>>> On my Fedora 9 machine, the overhead to start plperl seems to be about
>>> 40 msec.  This compares unfavorably to the time to start perl from the
>>> command line, which is under 4 msec.  I see that /usr/bin/perl pulls in
>>> libperl.so, so it's paying the same shlib overhead as we do.  How is it
>>> that we take ten times longer to start up?
>>>
>>
>> The above number was for plperl in a SQL_ASCII database.
>> Some more data points:
>>
>>                plperl          plperlu
>>
>> SQL_ASCII       40              18
>> UTF8            67              18
>>
>> which leads to the conclusion that those random little startup things
>> plperl does are just unbelievably expensive.
>>
>>
>>
>
> I suspect much of this time is taken in loading perl modules, (strict, Safe,
> utf8, SPI among others), not in anything very special that we do.:
>
>   andrew@constanza plperl]$ time perl -e ';'
>
>   real    0m0.004s
>   user    0m0.003s
>   sys     0m0.001s
>   [andrew@constanza plperl]$ time perl -e 'use strict; use Safe;use utf8;'
>
>   real    0m0.053s
>   user    0m0.016s
>   sys     0m0.007s
>
> cheers
>
> andrew
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