<div dir="ltr">Thanks for the information received so far.<div><br></div><div>Wouldn't it be good for Erlang to have a single object garbage collection function/bif? For example, when I no longer require a large object, I force to garbage collect it, without making a full sweep?</div><div><br></div><div>As mentioned in the document, a full sweep may degrade the performance.</div><div><br></div><div>- Eranga</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Sep 23, 2014 at 12:10 AM, Björn-Egil Dahlberg <span dir="ltr"><<a href="mailto:wallentin.dahlberg@gmail.com" target="_blank">wallentin.dahlberg@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">It should suffice by running an erlang:garbage_collect/0 directly after extracting some parts of the structure:<div><br></div><div><div style="font-family:arial,sans-serif;font-size:13px"><div>function1() -></div><div><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">X1 = ... fetch a large object ....</blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">... some processing...</blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">X2 = ... extract a part of X1 ...<br>erlang:garbage_collect(),<br>... long running job....<br></blockquote></div><div><br></div><div>As long as the object of X1 is not referenced by the process after the explicit call to the gc, you're fine.</div><div>Note also, an explicit call to garbage_collect/0 will always to a 'fullsweep'.</div><div><br></div><div>Ofc, as Jesper mentioned, the it's probably preferable not to fetch the whole object if possible.</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>// Björn-Egil</div><div><br></div></font></span></div></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">2014-09-22 19:56 GMT+02:00 Jesper Louis Andersen <span dir="ltr"><<a href="mailto:jesper.louis.andersen@gmail.com" target="_blank">jesper.louis.andersen@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">In general: No it won't. GC will trigger once the process has allocated enough data. If your processing is allocating enough data, this will quickly happen and you don't have to worry. If not, you may have to gently persuade the process to do so. There are several ways:<div><br></div><div>* Set fullsweep_after on the process with a low value (0) and run erlang:garbage_collect()</div><div>* Go through a hibernation with an immediate wakeup (feels ugly to me)</div><div>* Handle fetching and extraction in a separate process and send the extracted part 'x' back as a message. This will free up memory almost immediately for other processes to use (simple and elegant)</div><div>* Don't fetch the large object in the first place, but make it possible to ask for an extraction only. Or stream data a bit at a time and handle the stream in chunks rather than everything at once.</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Mon, Sep 22, 2014 at 4:11 PM, Eranga Udesh <span dir="ltr"><<a href="mailto:eranga.erl@gmail.com" target="_blank">eranga.erl@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr">Hi,<div><br></div><div>I'm trying to optimize my memory consumption in Erlang VM and to garbage collect as soon as possible.</div><div><br></div><div>Let's say I have a large object, "X", After some processing, I only need to work on small part of X, called "x".</div><div><br></div><div>Can someone advice me if below process flow will put the large object X in to garbage collection, while waiting for the long running job to continue?</div><div><br></div><div><div>function1() -></div><div><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">X = ... fetch a large object....</blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">... some processing...</blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">x = ... extract a part of X...<br>... long running job....<br></blockquote></div></div><div><br></div><div>If it's not putting X into garbage collection, does below change do that?</div><div><br></div><div>function1() -></div><div><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"><div>X = ... fetch a large object....</div></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"><div>... some processing...</div></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">x = ... extract a part of X...<br>function2(x).<br><br></blockquote>function2(x) -></div><div><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"><div>... long running job...</div></blockquote><br></div><div>Tks,</div><div>- Eranga</div></div>
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