by IUSR | Jan 14, 2024 | 咿咿呀呀, 补充两句
Java圈“网红”之一的Gunnar Morling(Twitter,Blog)在新年假期期间搞了一个“One Billion Rows Challenge”(Twitter话题:#1BRC)的活动,规则是编写一个程序读取10亿条CSV格式数据,根据每行第一列作为”主键“的字串计算相同”主键“下的所有浮点数数据的最小、最大和平均值,限Java,但编译器和运行时不限。具体规则位于这个挑战的代码库:https://github.com/gunnarmorling/1brc/...
by IUSR | Apr 9, 2007 | 技术文章
I did this long ago. Since I’m not required to do it repeatedly, it took me another 15 minutes to get warmed up. This time I’m recording the procedures here as a preparation for tomorrow’s exploration on why the hell that tomcat instance was taking...
by IUSR | Oct 10, 2005 | 技术文章
大名鼎鼎的BEA JRockit好像一直是server端的最佳jvm,性能上也早就超过了SUN的官方jvm,这次上去BEA网站乱逛,忽然发现个以前没有发现的东西:BEA JRockit Tools(不过似乎6月份就出来了…)。 BEA JRockit Tools目前包括BEA JRockit Memory Leak Detector和BEA JRockit Runtime Analyzer,暂时我还只试用了Memory Leak Detector,感觉还不错,都可以算个profile工具了 截几个图:...
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