Some Assembly Required

There’s a really cool little mmap gadget that maps the same underlying memory region into two contiguous virtual memory address ranges.

I posted recently about making kdb+ go faster.

Wherever I’ve worked on kdb+ installations the approach to authentication has been that there is no authentication.

I’ve recently been pondering how to improve the performance of kdb+.

So … at “$Work” I’ve been doing quite a bit with our Dashboard product that is being used more and more to report on different aspects of the desk’s trading activities and KDB is a key part of delivering content.

I’ve written a new C library, which you can find in my Github KDB repository which does the same kind of thing as -11!

We have an application at work that upon restarting intraday needs to replay the market-data tickerplant log file and subscribe to the live data feed.

It used to be the case that we rewrote c.java to be more efficient.

In my last post on a vectorised bitwise-OR function for kdb+, I wondered towards the end what the next interesting step would be — should it be the production of an AVX-variant of the same code, or should it be the modification of the code to handle short…

A long time ago I started writing some shared-library functions for kdb+ which would offer bitwise comparison of integer vector types using SSE vector registers.

This post is part of the series on performance monitoring with Intel MSRs on Linux: A Linux Module For Reading/Writing MSRs Intel MSR Performance Monitoring Basics Fun with MSRs: Counting Performance Events On Intel Scripting MSR Performance Tests With kd…

This post continues the series on performance monitoring with Intel MSRs on Linux using the batch-oriented kernel module to read and write values from and to the MSRs.

This post is part of the series on performance monitoring with Intel MSRs on Linux: A Linux Module For Reading/Writing MSRs Intel MSR Performance Monitoring Basics Fun with MSRs: Counting Performance Events On Intel Scripting MSR Performance Tests With kd…

This post is part of the series on performance monitoring with Intel MSRs on Linux: A Linux Module For Reading/Writing MSRs Intel MSR Performance Monitoring Basics Fun with MSRs: Counting Performance Events On Intel: this post Scripting MSR Performance Te…

This post is part of the series on performance monitoring with Intel MSRs on Linux: A Linux Module For Reading/Writing MSRs Intel MSR Performance Monitoring Basics: this post Fun with MSRs: Counting Performance Events On Intel Scripting MSR Performance Te…

This post is part of the series on performance monitoring with Intel MSRs on Linux: A Linux Module For Reading/Writing MSRs: this post Intel MSR Performance Monitoring Basics Fun with MSRs: Counting Performance Events On Intel Scripting MSR Performance Te…

Having just put the monster Relocations, Relocations blog-post to bed, at one point I caught myself trying to compute a relocation from the information given by readelf -r.

So, what’s a relocation?

It’s not often you get a really nasty surprise when writing software, and even less often that the nasty surprise is lurking in the compiler (or assembler).

There’s no easy answer to that.