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The Return of the Frame Pointers

Brendan Gregg

The problem is that this system has a default libc that has been compiled without frame pointers, so any stack walking stops at the libc layer, producing a partial stack that's missing the application frames. This is pretty common and usually goes unnoticed as the flame graph looks ok at first glance.

Java 145
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What Adrian Did Next?—?Part 2?—?Sun Microsystems

Adrian Cockcroft

Photo by Adrian I spent six years at Cambridge Consultants, building some interesting systems, managing our Sun workstations and learning a lot, but by then Sun had opened a sales office across the street, and I wanted to find out what they were going to release next, before everyone else. as a result there were product and messaging changes.

Tuning 52
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Measuring The Performance Of Typefaces For Users (Part 1)

Smashing Magazine

How would we test to see if there is any difference between a good sans serif and a serif typeface with users? These compiled systems for letters and symbols, which are representations of sounds and information, get a lot of use and are a large part of graphic communication. How well do typefaces work? Large preview ).

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GotW #97 Solution: Assertions (Difficulty: 4/10)

Sutter's Mill

Note that “no side effects on normal execution” is always automatically true for violation handlers even when an assertion system such as proposed in [4] allows arbitrary custom violation handlers to be installed, because those are executed only if we discover that we’re in a corrupted state and so are already outside of normal execution. [5]

C++ 58
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When Your Profiler Lies

Randon ASCII

Check out the count of ReleaseUserCrit events by process from the two runs of ProcessCreateTests : The conhost.exe process acquired and released it over 500,000 times per test! But, acquiring a critical system lock a few hundred thousand times per second seems dangerous at best. 6.7s -profile UserCritEvents.wpaProfile.

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bpftrace (DTrace 2.0) for Linux 2018

Brendan Gregg

Created by Alastair Robertson , bpftrace is an open source high-level tracing front-end that lets you analyze systems in custom ways. eBPF (extended Berkeley Packet Filter) is in the Linux kernel and is the new hotness in systems engineering. in 2004, so I have to think back to that time to understand it. eBPF does more.

C++ 110
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Windows Timer Resolution: The Great Rule Change

Randon ASCII

The behavior of the Windows scheduler changed significantly in Windows 10 2004, in a way that will break a few applications, and there appears to have been no announcement, and the documentation has not been updated. First, a bit of operating-system design context. Timer interrupts and their raison d’être.