The Linux kernel uses unused main memory as a cache to keep page cache, filesystem dentries and inodes. The use of the cache or buffer memory accelerates access to files stored on non volatile storage such as hard disks. The cached items can be cleared from memory by sending a signal to the Linux kernel using the /proc filesystem or the sysctl command.
On Android, if you replace a fragment using FragmentTransaction.replace, the old fragment could still be seen. This is most often caused by not setting the background color of the fragment.
The Filesystem notification APIs allows applications to watch certain files and be notified when they are opened, modified, deleted, or renamed. This greatly aids the applications, because before such filesystem event monitoring tools existed, such applications would have to read the disk repeatedly to detect any changes, which resulted in high disk and CPU usage.
MediaCorp Singapore offers 7 FTA (free-to-air) terrestrial television channels. Both Pay-TV operators, StarHub and SingTel, bundle the FTA channels together with their Pay-TV subscription packages.
Log files are sometimes written with epoch timestamps. To analyse the log file entries, we will first need to convert the time to a human readable format. In this article, we will look at a few available methods to convert the epoch time to real time or human readable time.
To check for a 64-bit capable CPU on a x86 system running on Linux, we can make use the /proc/cpuinfo file. Note that this will not determine if the OS is 64-bit or not. It will only determine if the CPU is capable of running a 64-bit OS. To check if the Linux OS is running 32-bit or 64-bit, you can refer to this article instead.
When writing configure scripts, it’s good to check if we are running on a 32-bit or 64-bit kernel or OS on a x86 system. There are a few ways to determine the machine architecture of a Linux system.
On Android, if you have a Spinner widget inside a Fragment, the Spinner could have white text on a white (or on a Light theme) background. The problem is most often due to an incorrect reference to the Context object.
The POSIX standard mandates that operating systems maintain file system metadata that records when each file was last accessed. This timestamp is known as atime and atime comes with a performance penalty – every read operation on a filesystem generates a write operation.
The Straits Times Android tablet app had a bug previously where it allowed free access to premium content – for both the ‘Tablet Edition’ and ‘PDF Edition’. This bug was patched after the app was updated (sometime in Aug 2014, if I am not wrong). That’s the bad news. The good news is that there is another workaround to access the premium content again for free.
