Studying Java Hotspot client compilers and I got to know the hotspot server compiler. But I learned that if Windows doesn't specify it by default, I will use the client compiler These days, it's hard to find a product with only one core, whether it's a computer or a cell phone Do you still use the client compiler by default? also I wonder if there are any devices that still use client compilers these days.
java
It may vary depending on the version of jdk and jre.
First of all, the client runs fast (not performance) Less is tailored to resource usage. It's optimized for client use when you need it.
In contrast, the server option performs a high level of optimization (git compilation, etc.), which slows the start time. Instead, the optimal binary code (by git) is obtained, resulting in faster performance.
Read Oracle faq below
JIT Compiler What's the difference between the -client and -server systems?
These two systems are different binaries. They are essentially two different compilers (JITs)interfacing to the same runtime system. The client system is optimal for applications which need fast startup times or small footprints, the server system is optimal for applications where the overall performance is most important. In general the client system is better suited for interactive applications such as GUIs. Some of the other differences include the compilation policy,heap defaults, and inlining policy.
Where do I get the server and client systems?
Client and server systems are both downloaded with the 32-bit Solaris and Linux downloads. For 32-bit Windows, if you download the JRE, you get only the client, you'll need to download the SDK to get both systems.
For 64-bit, only the server system is included. On Solaris, the 64-bit JRE is an overlay on top of the 32-bit distribution. However, on Linux and Windows, it's a completely separate distribution.
I would like java to default to -server. I have a lot of scripts which I cannot change (or do not want to change). Is there any way to do this?
Since Java SE 5.0, with the exception of 32-bit Windows, the server VM will automatically be selected on server-class machines. The definition of a server-class machine may change from release to release, so please check the appropriate ergonomics document for the definition for your release. For 5.0, it's Ergonomics in the 5.0 Java[tm] Virtual Machine.
Should I warm up my loops first so that Hotspot will compile them?
Warming up loops for HotSpot is not necessary. HotSpot contains On Stack Replacement technology which will compile a running (interpreted) method and replace it while it is still running in a loop. No need to waste your applications time warming up seemingly infinite (or very long running) loops in order to get better application performance.
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