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List:       openjdk-hotspot-gc-dev
Subject:    Re: Calling Runtime.gc twice
From:       David Sinclair <dsinclair () chariotsolutions ! com>
Date:       2017-04-01 0:11:32
Message-ID: CAGtiFWVA53rVSHa_894t5ko0JYxvw378E6xgD5Gb_s5ieAg_pQ () mail ! gmail ! com
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Ah, didn't think of that. I'll take a couple of heap dumps to try and
confirm that.

Thanks Kirk

On Friday, March 31, 2017, Kirk Pepperdine <kirk@kodewerk.com> wrote:

> Most likely the second GC is reclaiming Reference types identified during
> the first collection. Finalization is a likely candidate as it take one
> collection to get it into the reference queue, the queue is then process
> and the finalized object can finally be reclaimed.
>
> Kind regards,
> Kirk Pepperdine
>
> > On Mar 31, 2017, at 8:53 PM, David Sinclair <dsinclair@chariotsolutions.
> com> wrote:
> >
> > Hi all,
> >
> > I was hoping for an explanation of why calling Runtime.gc() twice shows
> a significant improvement in memory reclaimed as opposed to calling it once.
> >
> > Thanks
> >
> > dave
>
>

[Attachment #3 (text/html)]

<div dir="ltr">Ah, didn&#39;t think of that. I&#39;ll take a couple of heap dumps to \
try and confirm that.<div><br></div><div>Thanks Kirk<br><br>On Friday, March 31, \
2017, Kirk Pepperdine &lt;<a href="mailto:kirk@kodewerk.com" \
target="_blank">kirk@kodewerk.com</a>&gt; wrote:<br><blockquote class="gmail_quote" \
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Most likely the \
second GC is reclaiming Reference types identified during the first collection. \
Finalization is a likely candidate as it take one collection to get it into the \
reference queue, the queue is then process and the finalized object can finally be \
reclaimed.<br> <br>
Kind regards,<br>
Kirk Pepperdine<br>
<br>
&gt; On Mar 31, 2017, at 8:53 PM, David Sinclair \
&lt;<a>dsinclair@chariotsolutions.<wbr>com</a>&gt; wrote:<br> &gt;<br>
&gt; Hi all,<br>
&gt;<br>
&gt; I was hoping for an explanation of why calling Runtime.gc() twice shows a \
significant improvement in memory reclaimed as opposed to calling it once.<br> \
&gt;<br> &gt; Thanks<br>
&gt;<br>
&gt; dave<br>
<br>
</blockquote>
</div></div>



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