Without the idle task, which task gets the cpu-time accounted no one needs?
instanceof, and switch // java语法特性 JEP 508 Vector API (Tenth Incubator)// 这阵子个人关注最多的JEP JEP 509 JFR CPU-Time Vector API Tenth Incubator Panama New API Minor (#jep-509-jfr-cpu-time-profiling-experimental) JFR CPU-Time
我们可以记录该线程的执行和CPU-Time,参考代码如下: #include <stdio.h> #include <memory.h> #include <string.h> #include <jvmti.h count; jvmtiError err; //获取启动线程信息 (*jvmti)->GetThreadInfo(jvmti, thr, &info); //获取启动线程CPU-Time \n", info.name); printf("thread-%s cpu-time : %ld nanos\n", info.name, cpu_time); } void JNICALL
) 而不是通过HotSpot内部的C++代码,提高了可维护性,另外对Float16值的加法、减法、除法、乘法、平方根和fused乘法/加法运算现在支持x64 cpu自动矢量化JEP 509: JFR CPU-Time Profiling (Experimental)本特性引入了实验版的CPU-Time Profiling,可以捕获更准确的CPU时间分析信息使用示例$ java -XX:StartFlightRecording in Patterns, instanceof, and switch (Third Preview)JEP 508: Vector API (Tenth Incubator)JEP 509: JFR CPU-Time instanceof, and switchThird PreviewAmberLanguageNone508Vector APITenth IncubatorPanamaNew APIMinor509JFR CPU-Time
而不是通过HotSpot内部的C++代码,提高了可维护性,另外对Float16值的加法、减法、除法、乘法、平方根和fused乘法/加法运算现在支持x64 cpu自动矢量化 JEP 509: JFR CPU-Time Profiling (Experimental) 本特性引入了实验版的CPU-Time Profiling,可以捕获更准确的CPU时间分析信息 使用示例 $ java -XX:StartFlightRecording Patterns, instanceof, and switch (Third Preview) JEP 508: Vector API (Tenth Incubator) JEP 509: JFR CPU-Time switch Third Preview Amber Language None 508 Vector API Tenth Incubator Panama New API Minor 509 JFR CPU-Time
CPU 使用率 可以直接使用 htop/top 命令查看 CPU 使用率,idle 的cpu时间也可以直接通过 top 显示出来 CPU 利用率 = 1 - cpu-idle-time / cpu-time
user time in cpu minutes re "elapsed time" in minutes k cpu-time