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I'm trying to get the best possible performance from my quad core cpus, and i just discovered Parallel Colt (matrix-related operations).
Do you know any other package that include useful "parallel" utils (es. spanning tree, sorting, so on...)
you might want to take a look here:
java.util.concurrent that came with Java 5
I know this isn't exactly an answer to your question, but you might be interested in Scala. I believe utilizing many cores is one of the goals of Scala.
It also runs on the JVM so it interacts with java, is blazingly fast and contains all the new wizzy language features you might expect in a new language (and then some).
I suggest a package called LeoTask: https://github.com/mleoking/leotask
It helps you conduct tasks and aggregate the results in parallel.
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I am using MireDot for generating documentation for my REST service.
While it is awesome for generating the models and general information on the resources, I don't believe it currently has a way of "nicely" adding concrete example input/output.
That said, I am resorting to pure JavaDoc for writing the Json examples. And it's painful.
Does anybody know of any tool out there that helps write JavaDoc... and in particular makes it easy to insert formatted JSON/etc into it?
This is an old question I posted when I was just experimenting with ways to document an API.
Eventually I switched to Apiary over MireDot, which makes this task trivial. The reason for this transition was mostly to decouple the JavaDoc from the actual API documentation, as I found coupling those two can create a very messy code-base for a sophisticated API that requires a lot of documentation.
Ideally would have built documentation using an all-encompassing API management platform like Mashery or the like, but at the time that was not an option.
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I am looking for a library that will allow me to work with sound. This is just something that occurred to me and the problem is that in a large music collection I need to find tracks similar to another reference track . The simplest of things would be to find tracks with the same/almost-the-same tempo . Is this possible and are there any tools available for this ?
Finding music which is similar to other music is quite a complex field, and will probably require quite a bit of work if you're willing to spend quite a bit of time. If Java is your language of choice, then you could have a look at coMIRVA which will let you compare music based on timbre. From my experience, doing comparisons on that single dimensions isn't always good enough, but it is at least a start.
There's always the other path, which is to use an already existing commercial offering such as the Echo Nest and BMAT. I don't know what they cost, but it's probably quite pricey. However, these are products that have taken years to develop so I assume they must at least provide some sort of value.
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One thing I find very confortable with Numpy is the vectorization of operations with arrays (ie. the absence of any explicit looping), and the implicit element-by-element behavior of operations.
Since I have to move from Python to Java for a project, I was looking for any equivalent in well known math libraries (Colt, JScience, Apache Commons Math). But as far as I see it, none of them have equivalent capabilities.
Could anyone advise me?
I had the same problem as you but did not find a java solution. Java misses operator overloading for [] and has no slices. So you will not find a Java solution with the same, easy to read notation as numpy provides.
The nd4j library is essentially "NumPy for Java". It supports broadcasting and vector operations.
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I have made a couple dozens of tests for a legacy system I was handed over.
They generally test/describe some high level feature of the system, and I generally include in the test file itself a little comment about that feature. In this way, I both have a regression test suite and I'm compiling knowledge of the system in a single place, so others in the future don't have to lose all the time I lost trying to understand the (up to now) undocumented system.
Now, I was looking for some tool that would allow me to organize and see the high level features in a simpler way than having to look up to the test files. If it allowed a tag system, even better.
I have heard of Fitnesse but it doesn't look to fit really in what I'm looking for. I'm not looking for a tool to bridge the communication between the client and developers.
This project is coded in Java.
Thanks
If you moved the documentation from the unit tests to the classes you are testing, you could use either standard JavaDoc or doxygen.
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We want to compare general performance (CPU, I/O, network, ...) of different JVMs for the same Java version (1.5) in different environments (Windows, Solaris, ...).
Do you know of any JVM benchmarking application which can be used to compare results from different JVMs?
Thank you very much.
We ended up using SPECjvm2008 as we needed something more 'standard' than 'rigorous'.
The goal was to quickly compare performance between different JVM environments and show it to systems group. SPECjvm2008 was quite easy to setup and served well to the task.
The Java Grande Forum Benchmark Suite seems a little outdated, but it's the only one I found which speaks about I/O and network bandwith.