jit

Can I avoid JIT in .NET?

由 萝らか妹 提交于 2019-12-30 05:03:59
问题 Say if my code is always going to be run on a particular processor and if I have this information during installation - is there a chance I can avoid JIT? 回答1: You don't have to avoid JIT if you have CPU information at installation. If you compile your modules using the /platform:[x86/x64/IA64] switch, the compiler will include this information in the resulting PE file so that the CLR will JIT the code into the appropriate CPU native code and optimize the code for that CPU architecture. You

Can I avoid JIT in .NET?

由 ￣綄美尐妖づ 提交于 2019-12-30 05:03:24
问题 Say if my code is always going to be run on a particular processor and if I have this information during installation - is there a chance I can avoid JIT? 回答1: You don't have to avoid JIT if you have CPU information at installation. If you compile your modules using the /platform:[x86/x64/IA64] switch, the compiler will include this information in the resulting PE file so that the CLR will JIT the code into the appropriate CPU native code and optimize the code for that CPU architecture. You

What kind of optimizations do both the C# compiler and the JIT do?

由 一曲冷凌霜 提交于 2019-12-30 02:04:25
问题 I'm continuing my work on my C# compiler for my Compilers Class. At the moment I'm nearly finished with the chapters on Compiler Optimizations in my textbook. For the most part, my textbook didn't have Just-In-Time compilation in mind when it was written and I'm curious about the kinds of static, pre-jit optimizations the C# compiler performs versus what it does during the JIT process? When I talk to people about compiling against the CLR, I typically hear things like, "Most of the

What kind of optimizations do both the C# compiler and the JIT do?

由 梦想的初衷 提交于 2019-12-30 02:04:08
问题 I'm continuing my work on my C# compiler for my Compilers Class. At the moment I'm nearly finished with the chapters on Compiler Optimizations in my textbook. For the most part, my textbook didn't have Just-In-Time compilation in mind when it was written and I'm curious about the kinds of static, pre-jit optimizations the C# compiler performs versus what it does during the JIT process? When I talk to people about compiling against the CLR, I typically hear things like, "Most of the

What kind of optimizations do both the C# compiler and the JIT do?

由 旧城冷巷雨未停 提交于 2019-12-30 02:04:05
问题 I'm continuing my work on my C# compiler for my Compilers Class. At the moment I'm nearly finished with the chapters on Compiler Optimizations in my textbook. For the most part, my textbook didn't have Just-In-Time compilation in mind when it was written and I'm curious about the kinds of static, pre-jit optimizations the C# compiler performs versus what it does during the JIT process? When I talk to people about compiling against the CLR, I typically hear things like, "Most of the

How to make numba @jit use all cpu cores (parallelize numba @jit)

由 微笑、不失礼 提交于 2019-12-30 00:56:07
问题 I am using numbas @jit decorator for adding two numpy arrays in python. The performance is so high if I use @jit compared with python . However it is not utilizing all CPU cores even if I pass in @numba.jit(nopython = True, parallel = True, nogil = True) . Is there any way to to make use of all CPU cores with numba @jit . Here is my code: import time import numpy as np import numba SIZE = 2147483648 * 6 a = np.full(SIZE, 1, dtype = np.int32) b = np.full(SIZE, 1, dtype = np.int32) c = np

Why is it hard to beat AOT compiler with a JIT compiler (in terms of app. performance)?

由 坚强是说给别人听的谎言 提交于 2019-12-29 11:35:07
问题 I was thinking that JIT compilers will eventually beat AOT compilers in terms of the performance of the compiled code, due to the inherent advantage of JIT (can use information available only at runtime). One argument is that AOT compilers can spend more time compiling code, but a server VM could spend a lot of time, too. I do understand that JIT does seem to beat AOT compilers in some cases, but they still seem to lag behind in most cases. So my question is, what are the specific, tough

Why is llvm considered unsuitable for implementing a JIT?

由 耗尽温柔 提交于 2019-12-29 10:12:57
问题 Many dynamic languages implement (or want to implement) a JIT Compiler in order to speed up their execution times. Inevitably, someone from the peanut gallery asks why they don't use LLVM. The answer is often, "LLVM is unsuitable for building a JIT." (For Example, Armin Rigo's comment here.) Why is LLVM Unsuitable for building a JIT? Note: I know LLVM has its own JIT. If LLVM used to be unsuitable, but now is suitable, please say what changed. I'm not talking about running LLVM Bytecode on

Interpreting bytecode vs compiling bytecode?

由 丶灬走出姿态 提交于 2019-12-29 04:24:24
问题 I have come across a few references regarding the JVM/JIT activity where there appears to be a distinction made between compiling bytecode and interpreting bytecode. The particular comment stated bytecode is interpreted for the first 10000 runs and compiled thereafter. What is the difference between "compiling" and "interpreting" bytecode? 回答1: Interpreting byte code basically reads the bytecode line by line, doing no optimization or anything, and parsing it and executing it in realtime. This

JIT 即时编译的运作原理

由 馋奶兔 提交于 2019-12-28 17:50:52
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> JIT just-in-time，被翻译为即时编译，要理解即时编译我觉得和普通的编译（C，C++等静态语言）相对比便可理解， 普通编译可以说是 all before runtime，在你运行程序前你需要提前把程序完全编译为机器码，然后载入运行。而即时编译，并不是在运行前就编译好，而是在运行时，in runtime，对一些频繁使用的代码段，比如被经常调用的函数，循环段等编译成机器码，以使这些“热区”无需重复性的被解释器解释来提高程序的执行效率。 像 java 和 php 7.0： java 会通过 javac 字节码编译器将代码编译成 byteCode，运行时通过 JVM 载入 byteCode 进行解释执行，同时会将“热区”代码段发送给 JIT 编译器，JIT 会将这些代码编译成机器语言已被后期直接调用运行，无需再被解释器解释执行，从而提高执行效率。 PHP 7.0 的 JIT 也与之相同，php 是将 zend 预编译器编译好的 opcode 发送给 ZendVM 进行解释执行，同时会将 “热区” 代码段发送给 JIT 编译器， JIT 会将这些代码编译成机器语言已被后期直接调用运行，无需再被解释器解释执行，从而提高执行效率。 相对于普通的静态编译，JIT 是动态的
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