Recently I did an interesting investigation about redis performance. Given the same load, multiple connections to redis could perform 8x faster than single connection(see below). I am not considering pipelining here, and I already tried many optimization approach in my...

Introduction

Syntastic is a syntax checking plugin for Vim that detects syntax errors using external tools and return them back in Vim. I use it in in C++ development and it works pretty well. But to get started...

Introduction

Recently we are doing a major refactoring of the basic infrastructure. One goal is to use Google Protobuf during messing passing, which requires adding protobuf definition for all of our fundamental data format. Here is an example....

Introduction

Tcpcopy is a request replication tool which could be very useful in A/B testing and performance testing. It is able to replicate live traffic in production with little overhead and direct the traffic to testing modules. In...

Motivation

Recording live steam data is useful from several aspects:

1. Debug exceptions when using external api. Most of the time we redo the same call several times to debug. Instead, u could record once and analysis the...

CPU cache is a small and fast memory unit that CPU accesses. Understanding how it works and how to use it is crucial for high performance programming.

One good startpoint to learn CPU cache is “gallery of processor cache...

SystemTap (stap) is both scripting language and tool for profiling program on Linux kernel-based operation system. The most important feature is its ability to probe user-land function, different from tools like strace and perf which can only or...

A good dev environment is very important for developers. Here I will share the tools I use every day and the corresponding custom settings, including vim, several vim plugins, git and screen.

One image is worth a thousand words. Here...

I will open my own blog, Finally! I have this idea for a long time, but I am always telling myself the lie that I will start tomorrow. Today I did the same thing, and I say NO WAY! Nothing...