Who would have thought we would ever have an in-house OpenJDK expert? Congrats on this man. It's very exciting to watch. I feel like I am at the World Series of Programming.
On Thu, Aug 1, 2013 at 8:11 AM, Nick Williams <nicho...@nicholaswilliams.net > wrote: > Here's something interesting. > > So the last method I had to write, > StackTraceFrame.getStackTrace(Throwable), I finished last night. It's the > alternative to Throwable.getStackTrace(). Instead of returning > StackTraceElement[] (String for declaring class name), it returns > StackTraceFrame[] (Class<?> for declaring class). I expected this to > perform about the same or possibly even worse--boy was I wrong. > > StackTraceFrame.getStackTrace(Throwable) consistently returns in half the > time that Throwable.getStackTrace() does. Looking at why that is, I found a > HUGE inefficiency in Throwable.getStackTrace(). > StackTraceFrame.getStackTrace(Throwable) walks the backtrace 1 time and > runs O(n), where n is the number of elements in the stack trace. > Throwable.getStackTrace() walks the back trace 1+(n/2) times (first it > measures the depth of the back trace in one native method call, then it > gets the elements by index in a native method call for each, looping up to > that index each time), for an O(nlogn) (I think) running time. Much worse. > > So ... I improved Throwable.getStackTrace() and cut its running time in > half while I was at it. This also resulted in cutting > Thread.currentThread().getStackTrace()'s runtime in half. Think they'll > appreciate it? :-/ > > N > > On Jul 31, 2013, at 4:42 PM, Paul Benedict wrote: > > http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-July/019486.html > > > On Wed, Jul 31, 2013 at 4:40 PM, Gary Gregory <garydgreg...@gmail.com>wrote: > >> Hm... do you have a URL for this ray of hope? >> >> Gary >> >> >> On Wed, Jul 31, 2013 at 5:34 PM, Paul Benedict <pbened...@apache.org>wrote: >> >>> Nevermind. I just found it. Lousy browser caching! >>> >>> >>> On Wed, Jul 31, 2013 at 4:33 PM, Paul Benedict <pbened...@apache.org>wrote: >>> >>>> Did you find this out on the OpenJDK mailing list? I can't find the >>>> information; I may have missed it. >>>> >>>> >>>> On Wed, Jul 31, 2013 at 4:22 PM, Gary Gregory >>>> <garydgreg...@gmail.com>wrote: >>>> >>>>> KA-POW! Well done, sir. How about we use your mug as the new logo? ;) >>>>> >>>>> Gary >>>>> >>>>> >>>>> On Wed, Jul 31, 2013 at 4:47 PM, Nick Williams < >>>>> nicho...@nicholaswilliams.net> wrote: >>>>> >>>>>> A PARTIAL VICTORY! >>>>>> >>>>>> They've decide to revert the change to Reflection.getCallerClass for >>>>>> 7u40 and the rest of 7. Woohoo! >>>>>> >>>>>> "What will happen to this method in JDK 8 requires further thought." >>>>>> >>>>>> Meanwhile, about 300 lines of Java and 1,000 lines of native code >>>>>> later, I'm about ready to submit my patch for a public API replacement in >>>>>> Java 8. >>>>>> >>>>>> N >>>>>> >>>>>> On Jul 29, 2013, at 8:39 AM, Gary Gregory wrote: >>>>>> >>>>>> What a mess :( it seem unlikely new APIs will be added to Java 8 to >>>>>> help us, at least based on comments like >>>>>> http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-July/019110.html >>>>>> >>>>>> We might be left with documenting our side with "if you use features >>>>>> x and y in this context then the speed will degrade to so and so, here is >>>>>> where to ask Oracle to fix it: http:..." >>>>>> >>>>>> Gary >>>>>> >>>>>> On Jul 29, 2013, at 9:06, Nick Williams < >>>>>> nicho...@nicholaswilliams.net> wrote: >>>>>> >>>>>> core-libs-dev >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org >>>>> Java Persistence with Hibernate, Second >>>>> Edition<http://www.manning.com/bauer3/> >>>>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/> >>>>> Spring Batch in Action <http://www.manning.com/templier/> >>>>> Blog: http://garygregory.wordpress.com >>>>> Home: http://garygregory.com/ >>>>> Tweet! http://twitter.com/GaryGregory >>>>> >>>> >>>> >>>> >>>> -- >>>> Cheers, >>>> Paul >>>> >>> >>> >>> >>> -- >>> Cheers, >>> Paul >>> >> >> >> >> -- >> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org >> Java Persistence with Hibernate, Second >> Edition<http://www.manning.com/bauer3/> >> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/> >> Spring Batch in Action <http://www.manning.com/templier/> >> Blog: http://garygregory.wordpress.com >> Home: http://garygregory.com/ >> Tweet! http://twitter.com/GaryGregory >> > > > > -- > Cheers, > Paul > > > -- Cheers, Paul
