jit

When does a numba function compile?

江枫思渺然 提交于 2019-12-06 02:15:16
问题 I'm working off this example: http://numba.pydata.org/numba-doc/0.15.1/examples.html#multi-threading and it states that: You should make sure inner_func is compiled at this point, because the compilation must happen on the main thread. This is the case in this example because we use jit(). It seems in the example that calling jit on a function ensures compilation at that time. Would the multithreaded example work if instead of calling jit on the function we had used jit with argument types

Writing a new jit

旧巷老猫 提交于 2019-12-06 02:09:22
I'm interested in starting my own JIT project in C++. I'm not that unfamiliar with assembly, or compiler design etc etc. But, I am very unfamiliar with the resulting machine code format - like, what does a mov instruction actually look like when all is said and done and it's time to call that function pointer. So, what are the best resources for creating such a thing? Edit: Right now, I'm only interested in x86 on Windows, stretching a tiny bit to 64bit Windows in the future. You want to have a look at the processor manuals for the architecture you are interested in. Those manuals describe the

Why are JIT-ed languages still slower and less memory efficient than native C/C++?

时光总嘲笑我的痴心妄想 提交于 2019-12-06 01:43:27
问题 Interpreters do a lot of extra work, so it is understandable that they end up significantly slower than native machine code. But languages such as C# or Java have JIT compilers, which supposedly compile to platform native machine code. And yet, according to benchmarks that seem legit enough, in most of the cases are still 2-4x times slower than C/C++? Of course, I mean compared to equally optimized C/C++ code. I am well aware of the optimization benefits of JIT compilation and their ability

In Angular4 - How do I add lodash and do a build without errors

て烟熏妆下的殇ゞ 提交于 2019-12-06 01:27:45
I'm using angular.io quickstart seed: https://angular.io/docs/ts/latest/guide/setup.html I'm using Angular4 with typescript JIT Currently I would like to add lodash so I can use this in my component and then do an npm run build e.g. tsc -p src/" and not get any errors My component: import { Component } from '@angular/core'; import * as _ from 'lodash'; @Component({ moduleId: module.id, selector: 'HomeComponent', templateUrl: 'home.component.html' }) export class HomeComponent { constructor() { console.log(_.last([1, 2, 3])); console.log('hello'); } } My systemjs.config: /** * System

What happened to JEP 145 (faster jvm startup due to compiled code reusage)?

亡梦爱人 提交于 2019-12-06 00:52:19
问题 In 2012, a JEP 145 has been created in order to cache compiled native code in java for faster jvm startups . At that time, it had been officially announced. However, the JEP 145 does not exist anymore. What happened to it? The idea sounds great. I could not find an official statement why and when this project has been cancelled. 回答1: The text of the JEP is still available in the JEP source repository: http://hg.openjdk.java.net/jep/jeps/raw-file/c915dfb4117d/jep-145.md There doesn't seem to

Does initialization of local variable with null impacts performance?

天大地大妈咪最大 提交于 2019-12-06 00:39:13
问题 Lets compare two pieces of code: String str = null; //Possibly do something... str = "Test"; Console.WriteLine(str); and String str; //Possibly do something... str = "Test"; Console.WriteLine(str); I was always thinking that these pieces of code are equal. But after I have build these code (Release mode with optimization checked) and compared IL methods generated I have noticed that there are two more IL instructions in the first sample: 1st sample code IL: .maxstack 1 .locals init ([0]

Octave JIT compiler. Current state, and minimal example demonstrating effect

為{幸葍}努か 提交于 2019-12-05 18:31:09
I hear very conflicting information about Octave's experimental JIT compiler feature, ranging from "it was a toy project but it basically doesn't work" to "I've used it and I get a significant speedup". I'm aware that in order to use it successfully one needs to Compile octave with the --enable-jit at configure time Launch octave with the --jit-compiler option Specify jit compilation preference at runtime using jit_enable and jit_startcnt commands but I have been unable to reproduce the effects convincingly; not sure if this is because I've missed out any other steps I'm unaware of, or it

LLVM JIT speed up choices?

我只是一个虾纸丫 提交于 2019-12-05 18:00:11
问题 It's kind of subjective, but I'm having troubles getting LLVM JIT up to speed. Jitting large bodies of code take 50 times as much time as just interpreting them even with lazy compilation turned on. So I was wondering how can I speeding jitting up, what kind of settings I can use? Any other recommendations? 回答1: I am sorry to say that LLVM just isn't very fast as a JIT compiler, it is better as a AOT/static compiler. I have run into the same speed issues in my llvm-lua project. What I did was

Why does my algorithm become faster after having executed several times? (Java)

怎甘沉沦 提交于 2019-12-05 15:36:05
问题 I have a Sudoku solving algorithm for which my goal is to make as fast as possible. To test this algorithm, I run it multiple times and calculate the average. After noticing some weird numbers, I decided to print all times and got this result: Execution Time : 4.257746 ms (#1) Execution Time : 7.610686 ms (#2) Execution Time : 6.277609 ms (#3) Execution Time : 7.595707 ms (#4) Execution Time : 7.610131 ms (#5) Execution Time : 5.011104 ms (#6) Execution Time : 3.970937 ms (#7) Execution Time

llvm JIT add library to module

不想你离开。 提交于 2019-12-05 14:07:50
I am working on a JIT that uses LLVM. The language has a small run-time written in C++ which I compile down to LLVM IR using clang clang++ runtime.cu --cuda-gpu-arch=sm_50 -c -emit-llvm and then load the *.bc files, generate additional IR, and execute on the fly. The reason for the CUDA stuff is that I want to add some GPU acceleration to the runtime. However, this introduces CUDA specific external functions which gives errors such as: LLVM ERROR: Program used external function 'cudaSetupArgument' which could not be resolved! As discussed here , this is usually solved by including the