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What makes JNI calls slow?

...or trivial native methods, in 2010 I measured calls at an average 40 ns on my Windows desktop, and 11 ns on my Mac desktop. Unless you're making many calls, you're not going to notice. That said, calling a native method can be slower than making a normal Java method call. Causes include: Native m...
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If threads share the same PID, how can they be identified?

...ning the same TGID as the thread that started it. (a) Tremble in awe at my impressive graphical skills :-) share | improve this answer | follow | ...
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Difference between Covariance & Contra-variance

... To my future self, who is coming back to this excellent answer again to relearn the difference, this is the line you want: "[Covariance] works because if you're only taking values out of the API, and it's going to return somethi...
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How Do You Clear The IRB Console?

... With zsh ctrl + L doesn't work, ctrl + K does. (Oh My ZSH to be specific) – SidOfc Jul 20 '15 at 14:33 ...
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count the frequency that a value occurs in a dataframe column

... Using list comprehension and value_counts for multiple columns in a df [my_series[c].value_counts() for c in list(my_series.select_dtypes(include=['O']).columns)] https://stackoverflow.com/a/28192263/786326 share ...
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How to set ViewBag properties for all Views without using a base class for Controllers?

...way Creating an extension method on HtmlHelper [Extension()] public string MyTest(System.Web.Mvc.HtmlHelper htmlHelper) { return "This is a test"; } Then you can use it in all views @Html.MyTest() share | ...
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Does setWidth(int pixels) use dip or px?

... the pixels correctly. instead, it returns me the exact value i specify in my view: android:layout_width="50dip" in my case. it will return me 50 the exact value in the xml file. i then checked this in the app and as expected, the value is incorrect and draws the view too large then expected ...
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How to create a custom-shaped bitmap marker with Android map API v2 [duplicate]

... Is is working in Lolipop ? I have implemented similar feature in my app which loads marker image from url which is working fine on all os versions but Lolipop. In Lolipop it does not render the downloaded icon. Does anyone has idea? – Vinay Apr 3 '15 ...
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How to navigate through the source code by parts in CamelCase (instead of whole words)?

...b, since it is used in all browsers and most programs, so it is already in my muscle memory. – blue_note Mar 13 '17 at 13:59 ...
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MySQL SELECT WHERE datetime matches day (and not necessarily time)

... all records of a given day regardless of the time. Or in other words, if my table only contained the following 4 records, then only the 2nd and 3rd would be returned if I limit to 2012-12-25. ...