Pick up performance with generational garbage collection

Garbage collection (GC) reclaims the heap space previously allocated to objects no longer needed. The process of locating and removing those dead objects can stall your Java application while consuming as much as 25 percent of throughput.

本日志由 flyinweb 于 2010-01-19 18:05:26 发表到 技术文摘 中，目前已经被浏览 204 次，评论 0 次；

作者添加了以下标签： performance with generational garbage collection；

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Apache patch for libexpat.so: could not read symbols: File in wrong format
If you want to compile Apache 2.2.4 under Red Hat AS 5.0 x86-64 you can get this error:

/usr/lib/libexpat.so: could not read symbols: File in wrong format

There is a patch in the ASF Bugzilla (http://issues.apache.org/bugzilla/show_bug.cgi?id=28205 ), but this patch works only up to version 2.2.3. So, i create a new one, which works with 2.2.4 ;-)

本日志由 flyinweb 于 2010-01-18 17:19:15 发表到 WEB服务器 中，目前已经被浏览 419 次，评论 0 次；

作者添加了以下标签： libexpat.so: could not read symbols；

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Java Memory Analysis(Eclipse Memory Analyzer)

The Memory Analyzer is Open Source!

The Memory Analyzer is an Open Source Project at Eclipse (http://www.eclipse.org/mat/) licensed under the Eclipse Public License. Check out our blog, the WIKI and the forum. If you find a bug, please file it against Bugzilla.

本日志由 flyinweb 于 2010-01-18 11:47:22 发表到 技术文摘 中，目前已经被浏览 772 次，评论 0 次；

作者添加了以下标签： Memory Analyzer，MAT；

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Tuning Garbage Collection Outline

This document is a summary or outline of Sun's document: Tuning Garbage collection with the 1.4.2 Hotspot JVM located here: http://java.sun.com/docs/hotspot/gc1.4.2/

本日志由 flyinweb 于 2010-01-15 16:52:25 发表到 技术文摘 中，目前已经被浏览 237 次，评论 0 次；

作者添加了以下标签： Tuning Garbage Collection；

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mysqlreport使用指南

进行MySQL的配置优化，首先必须找出MySQL的性能瓶颈所在；而SHOW STATUS输出的报告正是用来计算性能瓶颈的参考数据。mysqlreport不像SHOW STATUS那样简单的罗列数据，而是对这些参考数据加以融合计算，整理成一个个优化参考点，然后DBA就可以根据这个优化参考点的值以及该点的衡量标准，进行对应调整。这篇文章既不分析mysqlreport的报告含义，也不说明优化参考点的计算公式和原理，只简单描述使用方法。后面再逐次深入分析。

本日志由 flyinweb 于 2010-01-15 11:16:22 发表到 数据库技术 中，目前已经被浏览 484 次，评论 0 次；

作者添加了以下标签： mysqlreport；

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Understanding Concurrent Mark Sweep Garbage Collector Logs

Understanding Concurrent Mark Sweep Garbage Collector Logs

Concurrent Mark Sweep (CMS) is a type of Garbage Collector (GC) available in the Java Virtual Machine (JVM) of the Java 2 SDK. This document explains the traces generated by JVM when run with certain diagnostic flags, specifically the logs generated with VM option -XX:+PrintGCDetails for this collector.

本日志由 flyinweb 于 2010-01-14 18:20:09 发表到 技术文摘 中，目前已经被浏览 453 次，评论 0 次；

作者添加了以下标签： Garbage Collector Log；

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Java Performance Tuning tool reports

The full list of Java Performance related tools and resources is available from the resources page. This page only lists those tools that have JavaPerformanceTuning.com reports available. New tool reports are provided with each newsletter.

本日志由 flyinweb 于 2010-01-14 12:53:00 发表到 技术文摘 中，目前已经被浏览 163 次，评论 0 次；

作者添加了以下标签： Java Performance Tuning tool；

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Tool Report: GCViewer

Introduction

GCViewer is a little tool that visualizes verbose garbage collection data generated by Sun and IBM Java Virtual Machines (JVM). The analysis of this data can be useful for tuning applications in order to maximize the performance of the garbage collector and thus the application itself.

Supported verbose:gc formats are:

  • Sun JDK 1.4 with the option -Xloggc:<file> (preferred)
  • Sun JDK 1.3.1/1.4 with the option -verbose:gc
  • IBM JDK 1.3.0 with the option -verbose:gc
  • IBM JDK 1.2.2 with the option -verbose:gc

    • 本日志由 flyinweb 于 2010-01-14 12:48:20 发表到 技术文摘 中，目前已经被浏览 273 次，评论 0 次；

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