随笔分类 -  Performance

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Windows上实现精确到毫秒的时钟所遇到的问题与解决方法
摘要：问题1： 15ms 内多次调用 GetSystemTime / GetLocalTime（java 中对应的函数为 System.currentTimeMillis()）， 返回相同的值 解决办法， 使用GetSystemTime 作为baseline， 然后用windows 提供的高精度计时器 QueryPerformanceCounter（java 中相应的函数为 System.nanoTime()） 做计时，精确时钟为baseline + 计时器时间。问题2： QueryPerformanceCounter/QueryPerformanceFrequency 的问题这个问题主要取决与wi 阅读全文
posted @ 2011-06-14 23:57 史莱姆 阅读(3891) 评论(0) 推荐(0)
TimeStamp Issue
摘要：Windows API:GetSystemTime/GetLocalTimeJAVA:Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("GMT"));15 毫秒内调用多次， 只能得到相同的timestamp 阅读全文
posted @ 2011-06-09 03:33 史莱姆 阅读(296) 评论(0) 推荐(0)
Embedded Database Engines Benchmark - SQLite 3.6.3 vs MS SQL CE 3.5 vs Firebird 2
摘要：http://engin.bzzzt.biz/embeddeddb.shtmlUPDATE 20-OCT-2008:Instead of creating a DBCommand for each iteration, I started to use one DBCommand instance, as any normal person would do in the first place. And it chagned the results quite a bit. It looks like object initiation for Firebird is expensive.. 阅读全文
posted @ 2011-04-04 02:11 史莱姆 阅读(759) 评论(0) 推荐(0)
High-Performance Synchronization
摘要：http://www.cs.rochester.edu/research/synchronization/ 阅读全文
posted @ 2010-10-18 23:27 史莱姆 阅读(201) 评论(0) 推荐(0)
Simple, Fast, and Practical Non-Blocking and Blocking Concurrent Queue Algorithms
摘要：http://www.cs.rochester.edu/research/synchronization/pseudocode/queues.html/Files/slime/1996_PODC_queues.pdfPseudocode from article of the above name in PODC96 (with two typos corrected), by Maged M. ... 阅读全文
posted @ 2010-10-17 02:40 史莱姆 阅读(594) 评论(0) 推荐(0)
GPUs vs FPGAs
摘要：The answer depends on what exactly you're trying to accelerate.GPU is really a "software acceleration" that can accelerate certain class of compute-intensive applications.The only interface to the G... 阅读全文
posted @ 2010-10-05 05:03 史莱姆 阅读(261) 评论(0) 推荐(0)
optimizing cpp (1)
摘要：operating system 64 bit systems have several advantages over 32 bit systems: The number of registers is doubled. This makes it possible to store intermediate data and local variables in registers rath... 阅读全文
posted @ 2010-10-01 23:43 史莱姆 阅读(383) 评论(0) 推荐(0)
Software optimization resources
摘要：http://www.agner.org/optimize/非常好的程序优化相关的resource 阅读全文
posted @ 2010-09-28 04:13 史莱姆 阅读(183) 评论(0) 推荐(1)
position-independent code (pic)
摘要：There is a significant runtime cost for position-independent code when using dynamic linking (shared objects) in Linux, BSD and Mac systems. Critical CPU-intensive code should never be stored in a sha... 阅读全文
posted @ 2010-09-28 00:12 史莱姆 阅读(458) 评论(0) 推荐(0)
winsock 改进的select模型 PK 完成端口(ZZ)
摘要：http://hi.baidu.com/spkiller/blog/item/b216a80176137f00728da57f.html完成端口理论值socket上限是6万多，也就是说纯连接能达到65535个，而select只能64个，更改了FD_MAXSIZE后最多1024，但是实际只能支撑七八百的极限。 由于某天对Winsock select模型的一个奇怪猜想，google、baidu了半天... 阅读全文
posted @ 2010-09-09 05:07 史莱姆 阅读(454) 评论(0) 推荐(0)
Core Instrumentation Events in Windows 7, Part 2
摘要：Dr. Insung Park and Alex BendetovWelcome back for the second part of our two-part article series: Core Instrumentation Events in Windows 7. In the first article, we presented a high-level overview ... 阅读全文
posted @ 2010-09-02 23:10 史莱姆 阅读(398) 评论(0) 推荐(0)
Core OS Events in Windows 7, Part 1
摘要：Dr. Insung Park and Alex BendetoversToday's computer software constantly breaks new grounds. Consumer software applications offer a sophisticated set of features that enable rich new experiences. P... 阅读全文
posted @ 2010-09-02 23:09 史莱姆 阅读(633) 评论(0) 推荐(0)
Event Tracing for Windows, continued
摘要：http://blogs.msdn.com/b/ryanmy/archive/2005/05/27/422772.aspx Uniformity. If you're debugging systemic problems involving multiple components, and all the involved components use ETW, you can have the... 阅读全文
posted @ 2010-09-02 22:44 史莱姆 阅读(348) 评论(0) 推荐(0)
Event Tracing for Windows
摘要：1 create and write the manifest.xml代码Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--<instrumentationManifestxmlns="http://schemas.microsoft.com/wi... 阅读全文
posted @ 2010-08-28 01:34 史莱姆 阅读(992) 评论(0) 推荐(0)
event tracing for windows example, windows 7 home
摘要：代码Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--//EventLogging.cpp:Definestheentrypointfortheconsoleapplication.//#include"stdafx.h"#include<wind... 阅读全文
posted @ 2010-07-13 23:19 史莱姆 阅读(391) 评论(0) 推荐(0)
Designing Applications for High Performance - Part III
摘要：http://blogs.technet.com/b/winserverperformance/archive/2008/06/26/designing-applications-for-high-performance-part-iii.aspx25 Jun 2008 7:44 PM Comments 14 Rick Vicik - Architect, Windows Server Perfo... 阅读全文
posted @ 2010-07-13 06:11 史莱姆 阅读(500) 评论(0) 推荐(0)
Designing Applications for High Performance - Part II
摘要：http://blogs.technet.com/b/winserverperformance/archive/2008/05/21/designing-applications-for-high-performance-part-ii.aspx 20 May 2008 9:48 PM Comments 1 Rick Vicik - Architect, Windows Server Perfo... 阅读全文
posted @ 2010-07-13 06:10 史莱姆 阅读(372) 评论(0) 推荐(0)
Designing Applications for High Performance - Part 1
摘要：http://blogs.technet.com/b/winserverperformance/archive/2008/04/25/designing-applications-for-high-performance-part-1.aspx25 Apr 2008 12:40 AM Comments 1 Rick Vicik - Architect, Windows Server Perfor... 阅读全文
posted @ 2010-07-13 06:09 史莱姆 阅读(442) 评论(0) 推荐(0)
InterlockedCompareExchange
摘要：msdn states that InterlockedCompareExchange has performance penalties due to "memory fences". For performance gains modern CPUs often execute instructions out of order to make maximum use of th... 阅读全文
posted @ 2010-07-13 06:04 史莱姆 阅读(717) 评论(0) 推荐(0)
使用 ETW 改善调试和性能优化
摘要：http://msdn.microsoft.com/zh-cn/magazine/cc163437.aspx事件跟踪 使用 ETW 改善调试和性能优化 Dr. Insung Park andRicky Buch 本文讨论: 了解 ETW 体系结构Windows Vista 中 ETW 的新功能使用事件提供程序 API 进行编程 本文使用了以下技术: Windows Vista 目录 Wind... 阅读全文
posted @ 2010-07-02 01:11 史莱姆 阅读(1848) 评论(0) 推荐(0)

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