It does.  --gdbjit_full gives me the complete stack.  Thanks again!

On Wednesday, September 28, 2016 at 12:09:52 AM UTC-7, Ben Noordhuis wrote:
>
> On Sat, Sep 24, 2016 at 2:40 AM, Jane Chen <[email protected] 
> <javascript:>> wrote: 
> > Thanks, Ben! 
> > 
> > I added that flag to my v8 init code.  Now I get: 
> > 
> > 12 xdmp::JSEngine::evalBuiltin() 
> > /space/projects/head/xdmp/src/JSEngine.cpp:11794 0x000000000391466e 
> > 11 xdmp::JSEngine::evalBuiltin() 
> > /space/projects/head/xdmp/src/JSEngine.cpp:11766 0x00000000039141ec 
> > 10 v8::internal::FunctionCallbackArguments::Call() 
> > /space/projects/v8-git/v8/src/api-arguments.cc:19 0x00007ffff549cef9 
> > 9 v8::internal::(anonymous namespace)::HandleApiCallHelper<false>() 
> > /space/projects/v8-git/v8/src/builtins.cc:5311 0x00007ffff5521150 
> > 8 v8::internal::Builtin_Impl_HandleApiCall() 
> > /space/projects/v8-git/v8/src/builtins.cc:5341 0x00007ffff5569d92 
> > 7 v8::internal::Builtin_HandleApiCall() 
> > /space/projects/v8-git/v8/src/builtins.cc:5329 0x00007ffff5524c1d 
> > 6 <symbol is not available> 0x0000332193c06147 
> > 5 <symbol is not available> 0x0000332193c06081 
> > 4 <symbol is not available> 0x00007ffad924d2a0 
> > 3 <symbol is not available> 0x0000000300000000 
> > 2 <symbol is not available> 0x00007ffad924d308 
> > 1 LazyCompile:~isPrime :1()  0x0000332193c6b884 
> > 
> > I suppose that's as good as it gets, right?  Any performance penalties 
> to 
> > leave it on always? 
>
> I suppose so; does --gdb_jit_full make a difference?  As to performance: 
>
> 1. --gdb_jit implies --nocompact_code_space so the code space (where 
> generated machine code is stored) may get fragmented over time.  I 
> have never observed that to be a problem in practice, though, even in 
> long-running programs. 
>
> 2. There is some bookkeeping involved but it's not huge.  Your 
> application may run a few percent slower, depending on what it does. 
>

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