BestTechVideos: Tag debugging Videos

Azul's Real-Time Profiling & Monitoring (RTPM) Tool

scoundrel — Sun, 09 Mar 2008 14:14:20 GMT

Google Tech Talks
February, 13 2008

ABSTRACT

I present an unscripted live demo of RTPM, Azul's profiling & monitoring tool (meaning: I'll take suggestions from the audience on what buttons to push during the demo). JVM's routinely collect a lot of very useful information internally and the Azul engineers were long frustrated that this information was not readily available outside the VM: with RTPM it now is.

Azul works with some of the largest Java programs around. We routinely debug performance problems in programs with hundreds of running threads (not just runnable threads) using garbage-collected heaps with 100's of gigabytes. RTPM is a big selling point with our customers, and our secret weapon for telling you what your program is doing.

Always-on (low overhead) everything
All stats viewable from standard web browers
Contended monitors, i.e. "hot locks" - and call stacks for
threads blocked on the lock
Live counts of all sys-calls, i/o, file caches, RPC's, native calls
Live stats on GC: heap size, GC cycle times, generation sizes,
app pause times, app allocation rates, etc
Live stats of live stuff in the heap;
Aggregate "points-to" on all heap objects. Suspect a leak? By
looking at the suspicious objects' points-to data you can quickly
zero-in on the root of the leak.
Live hot-code profiling
JIT asm dumps, annotated with live hardware perf counters
Live stack traces of running threads (in 1-line-per Java call
format, or 1-line-per-Java-local)
"Peek" into the live heap, much like a debugger can - straight
from live stack trace dumps
Surf around the loaded class hierarchy, or the JIT'd code or all
HotSpot flags or...
Works with 1000's of runnable threads
Works with 100's of Gigabyte heaps

Speaker: Cliff Click (Azul Systems)

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Browse the archive of posts filed under Development, Techtalks, Google, Java, Debugging, Lectures

Data Rendering Debugger (Perl, Python, Ruby, Firebug)

kraman — Mon, 28 Jan 2008 15:04:43 GMT

Smart Debugger for Perl, Python, Ruby, Firebug

Source link

http://develsdb.googlecode.com/svn/trunk/

http://develsdb.googlecode.com/svn/wiki/

Perl screencast

http://blip.tv/file/get/Kraman-DevelsdbSmartDebugger804.swf

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Smart Debugger for Perl, Python, Ruby, Firebug

kraman — Mon, 28 Jan 2008 15:04:30 GMT

Smart Debugger for Perl, Python, Ruby, Javascript (Firebug)

develsdb.googlecode.com/svn/trunk/

The screencast includes only perl debugger. please refer the above link for wiki on python, ruby and firebug.

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"Drill down into your Code - Software Quality via Code Queries in SemmleCode"

scoundrel — Sat, 17 Nov 2007 08:14:21 GMT

Google Tech Talks
November, 5 2007

ABSTRACT

Need a precision drill to unearth forgotten parts of your code base? Like to enforce coding conventions for clients of your API? Want to monitor code quality with metrics? Wish to implement a quality gate before check-ins that stops common bug patterns?

SemmleCode is a new, 100% free Eclipse plugin that encapsulates all these tasks as simple "code queries". It stores your project in relational form, and you can explore those relations to answer questions about your code.

SemmleCode ships with a large library of queries for common tasks, which you can use out of the box. Results can be visualised in many ways, including charts and graphs, all with links to the source. This talk starts by showing you that out-of-the-box functionality, and how it helps to improve quality with no effort at all.

The next level of using SemmleCode is to modify existing queries to implement new checks of your own. It is very easy to do that, since SemmleCode uses an intuitive object-oriented query language called .QL. .QL is tightly integrated in Eclipse, with full content-assist, syntax highlighting, and so on. In the talk, that functionality is illustrated by tailoring some queries to well-known open source projects.

The third and ultimate level of using SemmleCode is to write new query libraries of your own. These typical...

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Testing Metro Wifi

scoundrel — Tue, 06 Nov 2007 03:13:30 GMT

Google London Test Automation Conference (LTAC)
Google engEDU
September 8th, 2006

Presenter: Karl Garcia Credits: Presenter:Karl Garcia

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Google Test Automation Conference Lightning Talks

scoundrel — Tue, 06 Nov 2007 03:12:50 GMT

Google London Test Automation Conference (LTAC)
Google engEDU
September 8th, 2006

Presenters:
Harry Robinson, Dan North, Steve Freeman, Nat Pryce, Christine Newman, Andrin von Rechenberg, Ade Oshineye, Timur Hairullin, James Richardson, James Lyndsay, Jordan Dea-Mattson, Curtis "Ovid" Poe

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Successful parallel programming

scoundrel — Mon, 29 Oct 2007 19:07:28 GMT

Intel's James Reinders presents some recurring themes for developers looking to improve their game when it comes to programming parallel systems...

Host: James Reinders Director, Intel Corporation

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Firefox Leak Debugging Screencasts

scoundrel — Tue, 25 Sep 2007 21:44:45 GMT

I was asked to record some screencasts showing how I debug memory leaks so that other people could understand better how I use our memory leak debugging tools. So I've been recording (and talking) while I'm debugging memory leaks.

These are listed in the order I made them. Many of them probably aren't particularly interesting at all. First, I'd recommend reading the overview of our memory leak tools. Then:

For debugging of small sets of reference-counted objects with the refcount balancer, watch session 6 and then session 7.
For debugging using trace-malloc [need screencasts]
For debugging using leaksoup [need screencasts]
For debugging using diffbloatdump [need screencasts]
For debugging using DEBUG_CC (which you should use for leaked global window objects), look at session 3 for now, although it leaves a bit to be desired (see below). And maybe session 4-5, although it's one of the most confusing leaks I've debugged in the past few years.
For running the current tinderbox leak tests, see sessions 1 and 2

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Railscast: Debugging with ruby-debug

scoundrel — Sat, 28 Jul 2007 16:32:07 GMT

This episode will show you how to debug a rails app using ruby-debug: set a breakpoint, inspect variables, change the code and more.

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Railscast: Handling Exceptions

scoundrel — Fri, 06 Jul 2007 13:49:10 GMT

When an exception is raised in development you get the full error along with the stack trace. In production, only a simple message is displayed. Learn why this is and how to customize the handling of exceptions.

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