W3C home > Mailing lists > Public > public-media-capture@w3.org > October 2012

RE: recording proposal

From: Josh Soref <jsoref@rim.com>
Date: Fri, 26 Oct 2012 19:03:22 +0000
To: Media Capture <public-media-capture@w3.org>
Message-ID: <957F1ECDA90E004B8DBDE23CFC94E3A33A59DE57@XMB103ECNC.rim.net>
Harald wrote:
> Garbage collection doesn't collect memory that you have explicit
> references to, does it?

It doesn't.

> At 2 Mbits/sec, 0.4 Mbytes/sec, it would probably take you a few minutes
> to run out of memory (~5 hours for 8G of RAM, actually, unless I slipped
> a decimal).
> That's completely OK with me. You asked for it, you got it.

Assuming my math isn't terrible, this is 1.4GB/hr.

I'd like to point out that many systems use 32bit processes in which case the entire usable application address space is 2gb (that includes the app and its overhead).

Your UA+Libraries+application are probably going to consume ~100mb, on top of the first hour of recording (1hr * 1.4GB/hr), which means that there's probably another .5GB available, rounding that gives you perhaps another 20minutes [1hr * (1/(1.4 [GB/hr] / .5 [GB] ~= 1.5/.5) ~= 1/3)].

That means you have 80minutes, which is unfortunate if you're trying to deal with a 90 minute conference call (which conveniently is the length of the MC TF calls).

Note that actually running a web browser in 64bit world tends to cause it to waste more memory (because the pointer size generally doubles, and browsers use *lots* of pointers), so even if a mobile device could use 64 bit memory blobs, the UA wouldn't want to (it's better off using multiple processes).

I'm sorry for the delay, I've been worrying about other things.

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Received on Friday, 26 October 2012 19:03:56 UTC

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