FileVersionInfo.GetVersionInfo（）在线程应用程序中的性能 [英] FileVersionInfo.GetVersionInfo() performance in threaded app

问题描述

我正在开发一个小型部署应用程序来支持.Net文件部署到网络上7个不同位置的
。在

中它有点智能，它只部署已更改的文件，并将旧文件移动到备份

文件夹，这样大部分部署都可以完成。启动所有用户。

网络非常慢，所以我构建它以便每个部署（定义为

唯一源/目标文件夹组合）在一个单独的线程中运行。


我遇到的问题是FileVersionInfo.GetVersionInfo似乎是在表面下的单个线程中运行，或者是否有其他的

多线程问题，我不明白。每次通话的时间至少为b
两倍，并且每隔一段时间，CPU利用率达到100％且

在那里停留15-20秒，超过50％内核时间，无论

可能意味着什么。最终结果是应用程序的运行速度与单个

线程一样慢，除非它更令人讨厌。


唯一明显的争论点是线程可以在源文件夹中访问相同的

文件，但它们都是本地的或快速连接，所以

我可以''看看它会如何长时间搁置它。


有谁知道问题是什么以及如何解决它？请问单独的

AppDomain有帮助吗？流程？


谢谢，

马格努斯

解决方案

你好，


我想你可能会遗漏1个要点，


*在任何给定时间只能访问1部分硬盘驱动器

驱动器头。


我认为唯一不同的情况是，如果你要的话，那么
有一个RAID设置。


尼克。


-

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"无论如何。无论结果如何，你都会被改变。


Fergus - 2003年9月5日

/ \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \\ \\ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \

嗨Magsnus，

我在想它，还有我头脑中的一些东西。

但首先一个小问题。

7个同时连接的吞吐时间是否更长，或者是总处理器时间更长的总和（这是正常的）？

Cor

我认为Nak坚定不移。除非网络速度比磁盘访问/读/写速度慢
，否则那就是答案。


OHM

Nak < [e-mail]>在消息中写道

新闻：Os ************** @ TK2MSFTNGP10.phx.gbl ...

你好，

我想你可能会遗漏一个要点，

*驱动器头部只需
即可在任何给定时间访问硬盘的一部分。 />
我认为唯一不同的情况是，如果你要进行RAID设置。

尼克。

-

/ \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \\ \\ / \ / \ / \ / \ / \ / \ / \\ \\无论如何。无论结果如何，你都会被改变。

Fergus - 2003年9月5日

/ \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \

Hi,
I''m working on a little deployment app to support .Net file deployments to
about 7 different locations on the network. It''s somewhat intelligent in
that it only deploys changed files, and moves the old files to a backup
folder, so that most deployments can be done w/o booting all users off. The
network is pretty slow, so I built it so that each deployment (defined as
unique source/target folder combination) runs in a separate thread.

The issue I''m running into is that FileVersionInfo.GetVersionInfo seems to
either be running in a single thread below the surface, or have some other
issue with multithreading that I don''t understand. Each call is at least
twice as long and, at regular intervals, the CPU utilization hits 100% and
stays there for 15-20 secs, with more than 50% Kernel Time, whatever that
might imply. The end result is that the app runs just as slow as in a single
thread, except it''s even more annoying to watch.

The only obvious point of contention is that the threads may access the same
file in a source folder, but they are all local or on a fast connection, so
I can''t see how it would hang it for that long.

Does anyone know what the issue is and how I can fix it? Would a separate
AppDomain help? Process?

Thanks,
Magnus

解决方案

Hi there,

I think you might be missing 1 main point,

* Only 1 part of the hard drive can be accessed at any given time by the
drive heads.

I think the only case that this would be different is if you were to
have a RAID setup.

Nick.

--
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
"No matter. Whatever the outcome, you are changed."

Fergus - September 5th 2003
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

Hi Magsnus,
I was thinking about it, and there where some things in my head.
But first a little question.
Is the throughput time from 7 simultaneous connections longer or is the sum
from the total processor time higher (That would be normal)?
Cor

I think Nak has this hit firmly on the head. Unless the network speed is
slower than the disk access/read/write speed, then that''s the answer.

OHM
"Nak" <[e-mail]> wrote in message
news:Os**************@TK2MSFTNGP10.phx.gbl...

Hi there,

I think you might be missing 1 main point,

* Only 1 part of the hard drive can be accessed at any given time by the drive heads.

I think the only case that this would be different is if you were to
have a RAID setup.

Nick.

--
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ "No matter. Whatever the outcome, you are changed."

Fergus - September 5th 2003
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

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