Computer Systems A Programmer's Perspective Second Edition #include <stdio.h> main(){ int wr; wr = func1(); // wr=func2(); printf("%d",wr); } ; int w(){ return counter++; } int func1(){ return w()+w()+w()+w(); } int func2(){ *w(); }   Mode…

http://www.onjava.com/pub/a/onjava/2001/05/30/optimization.htmlComparing the performance of LinkedLists and ArrayLists (and Vectors) (Page last updated May 2001, Added 2001-06-18, Author Jack Shirazi, Publisher OnJava). Tips: ArrayList is faster than…

Awesome Courses  Introduction There is a lot of hidden treasure lying within university pages scattered across the internet. This list is an attempt to bring to light those awesome courses which make their high-quality material i.e. assignments, lect…

Computer Systems A Programmer's Perspective Second Edition As we will discuss, the extension of IA32 to 64 bits, termed x86-64, was origi- nally developed by Advanced Micro Devices (AMD), Intel's biggest competitor. Whereas a 32-bit machine can only…

reference from:https://www.voxxed.com/blog/2015/02/too-fast-too-megamorphic-what-influences-method-call-performance-in-java/ Whats this all about then? Let’s start with a short story. I proposed a change on the a Java core libs mailing list to overri…

Conferences ACM SEACM Southeast Regional Conference ACM Southeast Regional Conference the oldest, continuously running, annual conference of the ACM. ACMSE provides an excellent forum for both faculty and students to present their research in a frien…

php中的内存分配有用类似emalloc这样的函数,emalloc实际上是C语言中的malloc的一层封装,php启动后,会向OS申请一块内存,可以理解为内存池,以后的php分配内存都是在这块内存池中进行的,以至于efree,也不会向OS退回内存,而只是设置标志位,标识efree这块内存不再使用了,这样做的好处是,速度快,避免系统调用,因为频繁的从用户态和内核态之间的切换是很费CPU的. C语言的malloc函数的后面是glibc(内存管理系统) , 前段时间在看到php内存分配时,看到了ema…

glibc-2.14中的malloc.c源代码,供研究malloc和free实现使用: /* Malloc implementation for multiple threads without lock contention. Copyright (C) 1996-2009, 2010, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Wolfram Gloge…

http://www.lingcc.com/2012/05/16/12048/ a list of compiler books — 汗牛充栋的编译器参考资料 Posted on 2012年5月16日 by Lingcc | 14 Replies 前不久,有位<编译点滴>网友询问编译器方向的参考资料.其实之前讨论过一些编译器相关的在线资料–<有写编译器的冲动?这些资料很重要>.这篇博文就来总结总结编译技术相关的各类图书资料,供各位参考.这个书列是结合本人所了解的内容整理出来的,限于…

2015-03-06   328   Unusual Data Types    ——You can carry this technique to extremes,putting all the variables in your program into one big,juicy variable and then passingit everywhere.Careful programmers avoid bundling data any more than is logically…