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I'm using pigz (parallel gzip) to backup my data, but there's no increase in performance -- both pigz and regular gzip take about 13 hours to compress my 260GB of data to 26GB. Why isn't the parallel gzip (pigz) saving any time?

The server has 5 CPUs running and by default pigz utilizes all of the cores, I can see pigz processes using 7 threads. The server has 14 GB of RAM though most of it is cached with 13.8 GB RAM leaving it with 200 MB memory, disk space is sufficient. Where else can I check because pigz is running well but does not complete faster as I expected.

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Without knowing the specs of your system it's hard to say why. Three possibilities come to mind:

  • Your pigz process has only access to one cpu core. Then it can't be faster than non-parallel gzip.
  • Disk throughput is the limiting factor.
  • main memory is too limited (although that seems unlikely)

Check these first, of course there might be other causes that I didn't think about.

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