Tkanks for reply,  I said 9 times and 2 times because of I add the 
"--trace_gc" and  "--trace_gc_verbose"  v8 will 
print 9 or 2 messages, not the breakpoint trigged how many times though the 
breakpoint  triggered twice indeed.

在 2013年8月7日星期三UTC+8下午7时02分37秒,Ben Noordhuis写道:
>
> On Wed, Aug 7, 2013 at 10:49 AM,  <[email protected] <javascript:>> wrote: 
> > 
> >    I used  "gdb --args ../out/ia32.debug/d8 --trace_gc 
> --trace_gc_verbose 
> > run.js"  and  "r" 
> > 
> >    to run the benchmark without any breakpoint,  the gc will be 
>  triggered 9 
> > times(all in the newspace). 
> > 
> >    but if I set a breakpoint at Heap::CollectGarbage where I think is 
> the 
> > gc's entry point,  and "c" to complete the benchmark the gc just only 
> > triggered 2 times( in the newspace) 
> > 
> >   why? thank you. 
>
> There is more than one Heap::CollectGarbage() method.  It's possible 
> you set a breakpoint on one but not the other. 
>
> Besides that, there's also Heap::CollectAllGarbage() and maybe others. 
>
> Maybe Heap::GarbageCollectionPrologue() is a better place to intercept 
> things, I think it's called for both scavenges and full GC. 
>

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