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Re: IDL_IDLBridge: No gain? [message #85474 is a reply to message #85469]

Mon, 12 August 2013 06:59

dg86
Messages: 118
Registered: September 2012

Senior Member

HI Ronn,

Thanks very much for fielding my question. I added a callback routine that prints
the bridge's ID the elapsed time in the bridge's execution. Both the ID and the
starting time are passed to each bridge as USERDATA upon creation. I removed the
wait statements altogether. Instead, I stare at the command line, which reappears
immediately, until the bridges report back.

The bridges report back all at once, and in apparently random order, suggesting that they
are indeed running simultaneously and not sequentially. They report nearly the same
running time. Unfortunately, that time seems to scale linearly with
the number of running bridges.

Two bridges each report needing 11 seconds to run my expensive routine (lmfeature).
Four bridges each report 18.5 seconds.
Seven bridges report 39 seconds.
Eight bridges report 46 seconds.

Why does the execution time for one bridge depend on the number of bridges running
simultaneously?

All the best,

David

On Monday, August 12, 2013 7:08:23 AM UTC-4, rlk...@gmail.com wrote:
> Hi David,
>
>
>
> What's killing you is the wait in the while loop. What you need to do is specify a callback for your routines to call after they are done.
>
>
>
> In the callbacks you can set some flag to indicate when they are called and then in your main program just check the status of the flags every second or so.
>
>
>
> -Ronn Kling

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[Message index]

		IDL_IDLBridge: No gain? By: dg86 on Sat, 10 August 2013 13:05
		Re: IDL_IDLBridge: No gain? By: rlkling on Mon, 12 August 2013 04:08
		Re: IDL_IDLBridge: No gain? By: dg86 on Mon, 12 August 2013 06:59
		Re: IDL_IDLBridge: No gain? By: Lajos Foldy on Mon, 12 August 2013 08:05
		Re: IDL_IDLBridge: No gain? By: dg86 on Mon, 12 August 2013 08:16

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