Status: New
Owner: ----
New issue 3907 by [email protected]: Allowing asm.js memory growth
causes big slowdown
https://code.google.com/p/v8/issues/detail?id=3907
Version: Google Chrome 42.0.2305.3 dev (64-bit)
OS: Ubuntu 14.10
Architecture: x64
What steps will reproduce the problem?
1. Compile Em-DOSBox https://github.com/dreamlayers/em-dosbox using
Emscripten with memory growth enabled. (Link time switch "-s
ALLOW_MEMORY_GROWTH=1" is now the default in Emscripten incoming.)
2. Run DOS program using max cycles, such as Doom. A compiled version
running Doom can be found at:
https://dl.dropboxusercontent.com/u/16662598/Ports/DOSBox-web/doom.html?engine=dosbox-growth.js
3. Observe performance
What is the expected output?
When memory growth is disabled via "-s ALLOW_MEMORY_GROWTH=0" at link time,
Em-DOSBox runs quickly. Chrome 42 is faster than Chrome 40 and close to
Firefox asm.js performance. A version compiled without memory growth can be
run at:
https://dl.dropboxusercontent.com/u/16662598/Ports/DOSBox-web/doom.html?engine=dosbox-nogrowth.js .
Considering that allowing memory growth only makes minor changes and that
it doesn't cause a big slowdown in Chrome 40 and Firefox 35, there
shouldn't be a big difference in Chrome 42.
What do you see instead?
With memory growth enabled, Em-DOSBox runs much slower, and even
significantly slower than in Chrome 40.
Both of those JS files were built with profiling enabled. I didn't notice
any glaring issues in profiling output. It seems as if the whole thing is
running slower.
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