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Step by step user guide for STUX GNU/Linux (index)

Enhance performances

  1. Set up Virtual Memory (Swap)

      Use of virtual memory is always recomended, even if you have large amount of RAM.
      WARNING: if you run applications that requires more RAM than available, system could crash.
      If you are running STUX from Live CD, remember that at least 100 MB of RAM are used by system.

      Virtual memory extends RAM size to the size of phisical RAM + the size of partitions or files mounted as swap partition (swap space). With virtual memory, the memory addressable by operative system is no more limited to RAM size, but is limited to swap space size.

      You are suggested to use a swap space from 500 MB to 2 GB in size.

      There are cases where use of virtual memory is mandatory:

      • If you have low RAM amount ( < 96 MB )
      • If you plan to use STUX for a long time
      • If you perform tasks that require large amount of memory, like burn CD or DVD, create large ISO images, etc.
      • ...

      Existing swap partitions are automatically recognized and mounted at boot time.
      Existing swap files called 'swapfile' and located in the root directory of any mounted EXT or FAT partition is automatically recognized and mounted at boot time.

      It's possible to create swap space as a partition or as a file:

      • Create swap space using a disk partition:

        • Start STUX DEVICES

        • In section 'Hard Disk', select the partition that you want to convert as a swap device.
          WARNING: all data on selected partition will be lost !

        • Click the button 'Format'.
          You will see a picture like this:



          Choose 'swap' and press the button 'Format'.

          In the example in the picture, the partition /dev/hda3 will be:
          1. formatted as swap partition
          2. mounted as swap

          Swap devices are automatically recognized by Linux at boot time, even if you have not saved configuration.

      • Create swap space in a file:

        Create a swap are in a file is an easy and nice way to get swap space without repartition or format existing partitions.

        • Start STUX DEVICES
        • In section 'Swap files', click the button "New swap file".
          You will see a window like this:



        • Choose the file to save
        • Choose the size of the file (2 GB max)
        • Click the button 'Create'.

          Swap files are automatically recognized by STUX at boot time, but only if configuration is persistently saved.

      Note: to check swap space, you can use the command: 
      swapon -s
  2. Activate DMA on IDE devices

      To enable or disable DMA on IDE devices: 
      STUX CONTROL CENTER -> SETTINGS -> Harddisk-CD-DVD DMA Acceletration
      This program can turn on/off DMA acelleration (direct memory access) for various IDE peripherals. This can speed up access and throughput of data up to factor 5, which is, for example, good for playing multimedia files without interruptions.

      CAUTION: There are very few computer boards around which have a defective DMA controller. On these boards, enabling DMA can lead to errors when reading data. In extreme cases, data can be lost when writing to the device with DMA enabled.


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