Method, device, and computer equipment for preheating when java virtual machine starts

Abstract

Disclosed is a method, device and computer equipment for preheating when a Java virtual machine is started. The method includes: performing the following steps during the startup of the Java virtual machine: determining the time to be preheated according to preset system keywords and historical compilation logs. A method function; obtaining a unit test case corresponding to the method function to be preheated; and executing the unit test case.

Description

technical field [0001] The embodiment of this specification relates to the technical field of JAVA, and in particular to a method, a device, and a method for preheating a Java virtual machine when starting. Background technique [0002] The Java program running process includes two steps, which are as follows: compile the Java source code into bytecode through the compiler, and interpret the bytecode into machine instructions line by line through the JVM (Java Virtual Machine, Java Virtual Machine) interpreter and execute them. However, for some method functions or code blocks that need to be run frequently, that is, hot spot code (Hot Spot Code), the time cost of line-by-line interpretation is relatively high. Based on this, the JIT compiler (Just-In-Time Compiler) is introduced , just-in-time compiler), when the hot code is executed for the first time, the hot code is directly compiled into machine instructions by the JIT compiler, and stored in the cache area, and the dir...

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Problems solved by technology

[0002] The running process of the Java program includes two steps, which are as follows: compile the Java source code into bytecode through the compiler, and interpret the bytecode into machine instructions line by line through the JVM (Java Virtual Machine, Java Virtual Machine) interpreter and execute them. However, for some method functions or code blocks that need to be run frequently, that is, hot spot code (Hot Spot Code), the time cost of line-by-line interpretation is relatively high. Based on this, the JIT compiler (Just-In-Time Compiler) is introduced , just-in-time compiler), when the hot code is executed for the first time, the hot code is directly compiled into machine instructions by the JIT compiler, and stored in the cache area, and the directly compiled machine instructions are executed at the next execution

[0003] At present, in a distributed system, high-concurrency single-machine requests occur more and more suddenly, and the duration is longer and longer, while the JVM does not enable the JIT compiler for compilation until after the device is started, that is, after a large amount of business traffic flows in. Yes, the process of compiling a large amount of business traffic by the JIT compiler is likely to cause the device load to soar and the CPU usage to soar, which will cause the device to process some business traffic overtime, which may further cause the device to be unavailable, and what is even worse. The entire cluster fails due to the unavailability of a single device

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