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GUI applications startup is very slow when under apicalls analysis #19

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rodionovd opened this issue Jul 9, 2015 · 3 comments
Open

GUI applications startup is very slow when under apicalls analysis #19

rodionovd opened this issue Jul 9, 2015 · 3 comments
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@rodionovd
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dtrace help wanted maybe
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end-term

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@rodionovd
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There's a **~ 30 seconds** delay between starting analysis and the moment when an application starts launching (Dock icon appears, windows open, etc).
@rodionovd rodionovd added the bug label Jul 9, 2015
@rodionovd rodionovd self-assigned this Jul 9, 2015
@rodionovd rodionovd added this to the end-term milestone Jul 9, 2015
@rodionovd rodionovd changed the title GUI applications launch very slow when under apicalls analysis GUI applications startup is very slow when under apicalls analysis Jul 9, 2015
@rodionovd
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From my investigation it seems like the problem lays inside dtrace itself: the main delay is between launching the dtrace process and receiving first results from it.

Not sure what I'm going to do about it ¯\_(ツ)_/¯, just leave as is right now.

rodionovd added a commit that referenced this issue Jul 15, 2015
@rodionovd
apicalls: don't install any probes on sudo
d0f7cc0 
I guess it may have some (positive?) impact on #19
@rodionovd
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I've tried not to install any dtrace probes on sudo (we use it as a launcher for dropping privileges before executing a real target), but so far don't see any improvements: in general, it takes a Cocoa application ~20 seconds to just start launching.

Keep working on it.

@rodionovd rodionovd removed the bug label Jul 16, 2015
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As it turns out, the more pid probes we install the slower our target is 👎

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