Managed to solve this problem. The same piece of code takes now < 100
usec.
Strange thing is still that there is a big difference when i measure the
execution time of my whole modbus reply function when measured from
javscript or in c++.
C++ code takes only 5 ms to execute, but the additional javascript glue
adds another 2 ms on top of this. Does anyone now what the glue does? Does
this result from dynamically loading a large size *.node file?
Async call to reply function
> Handle<Value> js_reply_async(const Arguments& args) {
reply_t* reply = new reply_t;
> clock_gettime(CLOCK_MONOTONIC, &reply->tstart);
> ...
> uv_work_t* req = new uv_work_t();
> req->data = reply;
> uv_queue_work(uv_default_loop(), req, reply_work, (uv_after_work_cb)
> reply_after);
Just before performing the callback to javascript
> clock_gettime(CLOCK_MONOTONIC, &reply->tstop);
> reply->cb->Call(Context::GetCurrent()->Global(), 1, argv);
> reply->cb.Dispose();
> printf("Startaddress %d offset %d ts %lu s, %lu ns\n", ((reply->req[2]
> <<8) | reply->req[3]), ((reply->req[4] <<8) | reply->req[5]),
> reply->tstop.tv_sec-reply->tstart.tv_sec,
> reply->tstop.tv_nsec-reply->tstart.tv_nsec);
And my javascript
> var starttime = timers.nanotime(timers.CLOCK_MONOTONIC);
> mb.reply(self.ctx, query, len, startAddress, offset, data,
> self.settings.nrRegisters, function(error){
> var stoptime = timers.nanotime(timers.CLOCK_MONOTONIC);
> console.log("startAddress " + startAddress + "\tlen " + len + "\tduration
> "+ ((stoptime.sec * 1000 + stoptime.nsec / 1e6) - (starttime.sec * 1000 +
> starttime.nsec / 1e6)) + " ms");
> }
On Wednesday, April 30, 2014 11:03:15 PM UTC+2, Ben Noordhuis wrote:
>
> On Wed, Apr 30, 2014 at 3:51 PM, Kees k <[email protected]<javascript:>>
> wrote:
> > I get an error with v8: '3.11.10.25':
> > FATAL ERROR: v8::Object::SetIndexedPropertiesToExternalArrayData()
> JSArray
> > is not supported
> >
> > Now I am trying this option:
> > GetPointerFromInternalField (int index)
>
> Pass it a normal object, not an array (i.e. {} instead of []), it will
> be indexable like an array afterwards.
>
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