| From: | Craig Ringer <craig(at)postnewspapers(dot)com(dot)au> |
|---|---|
| To: | Radosław Smogura <rsmogura(at)softperience(dot)eu> |
| Cc: | Israel Ben Guilherme Fonseca <israel(dot)bgf(at)gmail(dot)com>, pgsql-jdbc(at)postgresql(dot)org |
| Subject: | Re: Question about speed: Weird Behavior |
| Date: | 2011-06-13 12:24:43 |
| Message-ID: | 4DF6018B.2000307@postnewspapers.com.au |
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| Lists: | pgsql-jdbc |
On 06/13/2011 08:11 PM, Radosław Smogura wrote:
> Of course whole image is much more complicated. There may be some
> fluctuations with JIT, as Craig wrote (actually you should take times
> after 1000 of invocations - if it's client JVM , or change compile
> threshold in JVM to be sure if JVM doesn't gives you overhead). There
> may be some GC overhead, you should call System.gc after or before each
> pass to start with similar environment. As well, some if you connect
> through TCP/IP this may randomize your results too.
Yep. Yet more good reasons to try to benchmark real-world tasks instead
of synthetic micro-benchmarks, which are *REALLY* hard to get right.
Israel Ben Guilherme Fonseca: Is there a certain number of repetitions
after which the numbers stop changing?
--
Craig Ringer
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