NoDB | NoDB is n't a database .. but it sort of looks

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Community Discussions

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Java crypto comparisons: Does SunJCE use native code?

specific overload of SpringApplication.run is missing in spring-boot-2.0.0.RELEASE

Connecting to shards in MongoDB mongo shell

Compare two files in two different folders and perofrm installation of that file with PowerShell

no remote repository when installing dbweb

QUESTION

Java crypto comparisons: Does SunJCE use native code?

Asked 2019-Apr-12 at 15:04

I wrote up a test to compare some Java crypto provider performance (pasted below). I was surprised to find that the SunJCE implementation ended up being the fastest, since others (at least Apache Commons Crypto) relies on a native openssl implementation.

Does SunJCE use a native implementation as well?
Is there an issue with this test that's giving me incorrect/misleading results?

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ANSWER

Answered 2019-Apr-12 at 15:04

Yes, it does. And no, it doesn't.

AES-NI is used through Java intrinsics, which replaces byte code by the native implementation of AES. So although you won't find a direct call to the AES-NI instructions, the doFinal call in your Java code will at some point use hardware acceleration. So the code of the JCE is just Java, but the JIT can still speed it up. Nifty, huh?

To really test your code you may want to use a warm up time for the JIT (to enable the AES-NI as well). You should be able to use a buffer instead of generating a new array object each time for the ciphertext.

More importantly, might want to catch the output of that buffer and e.g. XOR it into a final buffer and print it out. This will make it next to impossible for the compiler to skip the code altogether. Compiler optimizations are tricky to handle if you're not really interested in the results themselves; the compiler or JIT may just skip the encryption altogether to obtain the same result, after all.

You probably need more AES operations in a single loop too. You could implement the Monte Carlo testing required for the AES competition as a base.

Source https://stackoverflow.com/questions/55622035

QUESTION

specific overload of SpringApplication.run is missing in spring-boot-2.0.0.RELEASE

Asked 2018-Mar-20 at 09:29

I need to upgrade an application from spring-boot-1.2.5.RELEASE to spring-boot-2.0.0.RELEASE.

I have this following code:

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ANSWER

Answered 2018-Mar-20 at 09:18

You can use annotation @ImportResourcefor import configuration XML

Source https://stackoverflow.com/questions/49379657

QUESTION

Connecting to shards in MongoDB mongo shell

Asked 2018-Mar-08 at 14:25

I'm following the tutorial in the MongoDB: The Definitive Guide, 2nd edition, for a databases course, and it appears not to work in version 3.6.2.

Basically I have two mongo shells opened using mongo --nodb.

Then, in the first, I run cluster = new ShardingTest({"shards": 3, "chunksize": 1}) (which works and produces a steady stream of output).

In the second shell, the book says to run db = (new Mongo("localhost:30999")).getDB("test") which fails. I was told by a colleague instead to run db = (new Mongo("localhost:20000")).getDB("test"), which worked.

Then, I inserted data which worked as well. However, when trying sh.status(), I got the message printShardingStatus: this db does not have sharding enabled. be sure you are connecting to a mongos from the shell and not to a mongod.

After searching online, I figured I'd run sh.enableSharding(db) which also gave me the following error:

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ANSWER

Answered 2018-Mar-01 at 19:36

The commands bellow show how to run 3 shards instances and 3 config instances in your localhost. For each of these shards also are created 3 replica sets (mongod instances), may it can help you:

clean everything up

Source https://stackoverflow.com/questions/49054179

QUESTION

Compare two files in two different folders and perofrm installation of that file with PowerShell

Asked 2017-Apr-21 at 11:46

I have a PowerShell script which compares two files in two different folders. If a file with the proper number exists in the first folder then it runs it.

If the file doesn't exist in the first folder then it copies it from the second folder to the first folder and runs it from the first folder.

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ANSWER

Answered 2017-Apr-21 at 11:46

For your compare try this:

Source https://stackoverflow.com/questions/43517718

QUESTION

no remote repository when installing dbweb

Asked 2017-Apr-12 at 19:42

I want to install dbweb to manage a MySQL database server but I get this error in cmd. I tried to to install that on my go project and get same error.

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ANSWER

Answered 2017-Apr-12 at 19:42

It gives those errors because github.com/go-xorm/dbweb has dependencies on those other two packages which it cannot update because you have them locally but they have no remote so go get does not know from where to pull the code.

Try removing them:

Source https://stackoverflow.com/questions/43367802

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