distributed | 易学教程

Parallel processing in Matlab

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问题 I created two functions: generating data and processing data. Data processing is time-consuming, so I want to process them in a parallel thread. But I have some problems with them. At first, here is my program: result = zeros(1, 10); matlabpool open local 2 spmd for a = 1:5 data = generate_data(); display(sprintf('Received data on CPU%d: %d', labindex, data)); result(end + 1) = process_data(data); end display(sprintf('All done on CPU%d', labindex)); end matlabpool close And log of what it

Shutdown dask workers from client or scheduler

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问题 In the API, there is a way to restart all workers and to shutdown the client completely, but I see no way to stop all workers while keeping the client unchanged. Is there a way to do this that I cannot find or is it a feature that doesn't exist ? 回答1: This seems like a feature that does not exist, but is nevertheless doable using the current code. You can use run_on_scheduler to interact with the methods of the scheduler itself. workers = list(c.scheduler_info()['workers']) c.run_on_scheduler

When to use the XCode Distributed Build Feature

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问题 I work in a small iPhone development team, in our office, we have at least 4 copies of XCode running on the network at any one time. Contemplating getting everyone to have it running. We're networked together using a standard WIFI Switch, so network speed and latency isn't as good as wired network... Just wondering, is there any real time gain to be had on using distributed builds? Once it passes the relevant data back and forth over the network. At least for relatively small projects. 回答1:

Distributed Version Control System [closed]

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Closed. This question is off-topic . It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I want to implement distributed version control system with my fellow programmers. They are scattered around. All using different IDEs or no IDEs/ different operating systems too. I'm new to the whole scenario. Also, we have no root permission of our server, so we cannot use the server. How to go about it? What client side tool should I use preferably with a GUI. And how to implement it with a server or web

Multi-tier vs Distibuted?

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Multi-tier and/or ditstributed apps, do they have the same meaning ? When we talk about layers in these apps, is it physical layers (database, browser, web server,...) or logical layers (data access layer, business layer,...) ? Maybe these two sentences do convey intuitively the distinction between distributed and multi-tier : Distributed : You replicate the processing amongst nodes Multi-tier : You split the processing amongst tiers In one case, the same processing is replicated over several nodes. In the other case, each tier has a distinct responsibility and the processing running on each

Best way to share custom PHP code amongst projects

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I'm developing a distributed environment, mostly in PHP. A lot of the projects that I have share some of the same code. For example my logging code (based on log4php but with some custom additions). I can just copy-paste this code in every project, but naturally, if I change anything in it I need to re-paste it everywhere and 'hope' it doesn't change anything. Obviously not a good way. Now, I was wondering: what is the best and simplest way of sharing this code? I'm hoping there is something as easy as making your own private PEAR-like channel? Do people do this for this use case? Or is there

java: how to set a global thread-ID?

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Is there any possibility to set unique ID for a thread? In distributed system where threads are created on many different machines (e.g. by RMI)? I need it to create log messages. From my research I know that it can be done using log4j mdc/ndc, but only in single thread. My problem is that ID has to be set when thread is created (to use the same ID for threads on different JVM but for the same request) I am new to distributed systems. If you want to have a globally unique request id, you can use the prcoessAndName (see below) with a counter and pass this with your message/request and use this

Profiling network software / Profiling software with lot of system call waiting

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I'm working on a complex network software and I have trouble determining how to improve the systems performance. Specifically in one part of the software which is using blocking synchronous calls. Since this part of the system is doing heavy computations it's nearly impossible to determine whether the slowness of this component is caused by these computations or the waiting for the other parts of the system. Are there any light-weight profilers that can capture this information? I can't use heavy duty profile like valgrind since that would completely skew the results (although valgrind would

Java Hadoop: How can I create mappers that take as input files and give an output which is the number of lines in each file?

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问题 I'm new to Hadoop and I've managed just to run the wordCount example: http://hadoop.apache.org/common/docs/r0.18.2/mapred_tutorial.html Suppose we have a folder which has 3 files. I want to have one mapper for each file, and this mapper will just count the number of lines and return it to the reducer. The reducer will then take as an input the number of lines from each mapper, and give as an output the total number of lines that exist in all 3 files. So if we have the following 3 files input1

How to create a simple distributed Map for Java application?

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I am looking for a Map to share information between two instances of a Java web application running on separate machines. Reads and writes to this map need to be very fast and don't have to be transactional i.e. its ok if one instance has stale data for a while. Any recommendations? I need to keep track of the last time a user did something in the application, so its not terribly bad if this information is out of date. Speed and ease of use are important. I don't want writes to the Map to impact response times. I would try Hazelcast, JGroups or Ehcache. All support a distributed map. EDIT: