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Systemd service

sudo vi /etc/systemd/system/foo.service

#/etc/systemd/system/foo.service
[Unit]
Description=DESCRIPTION

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Linux Swap

# 1. generate an empty file
$ dd if=/dev/zero of=/var/swapfile bs=1M count=1024
# 2. format it as swap
$ mkswap /var/swapfile 
# 3. turn on it
$ swapon /var/swapfile
# 4. make it works after boot

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1. 下载驱动 Nvidia

https://developer.nvidia.com/opencl

2. 安装 pybind11

py -3 -m pip install pybind11

3. 安装 pyopencl

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• Version Control
  • Git
  • GitHub
  • OsChina
    • Issue
• Language
  • Java SE
    • Functional Programming
    • Stream
• Date

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        Callable r = () -> {
            try {
                log.debug("TryLock");
                readLock.tryLock(5, TimeUnit.SECONDS);
                Thread.sleep(1000);
                log.debug("Read");
                readLock.unlock();
            } catch (InterruptedException e) {
                e.printStackTrace();

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#Logging Best Practices

Always log, and always log in right place, on right level.

Error Unexcepted exceptions happened, should write down the error message and the call stacks.

log.error(ex.getMessage(),ex);

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java -jar xxx.jar --server.port=80

mvn spring-boot:run -Drun.jvmArguments="-Dserver.port=80"

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There are two types of exceptions in java language.

• Checked Exceptions
• Runtime Exceptions

A Checked Exception is a part of the method signature, with the method name, arguments and returns. So if a method throws a checked exception, then the caller should have the knowlege about the exception, the deal with it. Thus we say a checked exception is a Exposing of the inner logic of a method.

And anothor way to classify the exceptions:

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default_tmp_storage_engine = MyISAM
default-storage-engine = MyISAM
collation-server = utf8mb4_unicode_ci
character-set-server = utf8mb4

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#!/bash

targethost='root@targethost'
# eg. 'root@dev.csdra.net'
targetpath='/var/www'
# eg. '/var/www'
targetname=TARGETNAME
# eg. 'SomeProject'
targetport=TARGETPORT
# eg. 8080