Status: New
Owner: ----
New issue 3346 by [email protected]: performance drop introduced by
Function::NewInstance() and Object::SetPrototype()
http://code.google.com/p/v8/issues/detail?id=3346
We are upgrading from v3.22.24.19 to v3.25.30, and found there is
significant performance drop introduced by two functions,
Function::NewInstance() and Object::SetPrototype().
To demonstrate the performance change, two sample programs are attached
here. Check the attachment 'v8-issue-demo.tgz'. There are two folders
inside, 'NewInstance' and 'SetPrototype', used to demonstrate the change
caused by these two functions respectively. You may build the two
shell-v8-<ver>.cc files (same programs but modified for v8 api changes) in
each of these two folders and execute it with the following command (the
script file 'createPoint.js' may be found in the attachment too.):
time ./shell createPoint.js
Here're the performance output that we generated using the attached program.
*NewInstance*
v3.22.24.19 v8-3.25.30
==============================================
real 0m0.335s 0m0.397s (-18%)
user 0m0.330s 0m0.380s (-15%)
sys 0m0.010s 0m0.020s
*SetPrototype*
v3.22.24.19 v8-3.25.30
==============================================
real 0m0.371s 0m0.446s (-20%)
user 0m0.360s 0m0.450s (-25%)
sys 0m0.010s 0m0.000s
You could see there is a performance degradation between the two versions
of V8. Is this change to be expected? Is there any alternatives or some
other way to call these two functions more efficiently? Any suggestion is
appreciated.
ps: the sample program may be a little silly and doesn't makes much sense.
But it is just used to show the performance change.
Attachments:
v8-issue-demo.tgz 5.0 KB
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