MemShrink:P1 Bugs fixed Terrence Cole made a change that allows unused arenas in the JS heap to be decommitted, which means they more or less don’t cost anything. This helps reduce the cost of JS heap fragmentation, which is a good short-term step while we are waiting for a compacting garbage collector to be implemented. […]
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One thing I’ve learnt while working for Mozilla is that a web browser can be characterized as a JavaScript execution environment that happens to have some multimedia capabilities. In particular, if you look at Firefox’s about:memory page, the JS engine is very often the component responsible for consuming the most memory. Consider the following snapshot […]
I’ve been on vacation, so this report covers (incompletely) the past six weeks’ worth of MemShrink improvements. Big Things Paul Biggar and Mike Hommey enabled jemalloc on Mac 10.6. This will hopefully reduce fragmentation on that platform. And it brings it in line with Windows, Linux and Android. Now we just need it for Mac […]
tl;dr Firefox 7 uses less memory than Firefox 6 (and 5 and 4): often 20% to 30% less, and sometimes as much as 50% less. In particular, Firefox 7’s memory usage will stay steady if you leave it running overnight, and it will free up more memory when you close many tabs. This means that […]
I’ve been working a lot on about:memory lately. It’s a really useful tool, but one frustrating thing about it is that a decent chunk of our memory usage is not covered by any of the existing memory reporters, and so is falling into the “heap-unclassified” bucket: This bucket typically accounts for 30–45% of about:memory’s “explicit” […]
This was the final week of development for Firefox 7, and lots of exciting MemShrink stuff happened. Per-compartment memory reporters I landed per-compartment memory reporters, using the new memory multi-reporter interface. I’ve written previously about per-compartment reporters; the number of things measured has increased since then, and each compartment now looks like this: One nice […]