pigz seems do not using all cpu core

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http://forums.cpanel.net – Hello I've configured pigz to use for backup process, and seems do not using all cpu core: I do not see any difference with gzip backup in the time backup. cpu usage is always below 50%. Any help ? I doing some wrong ? roberto This is the top process: ---------------------- Tasks: 84 total, 1 running, 75 sleeping, 0 stopped, 8 zombie Cpu(s): 7.3%us, 1.0%sy, 4.5%ni, 86.1%id, 0.9%wa, 0.0%hi, 0.0%si, 0.2%st Mem: 2621440k total, 1255892k used, 1365548k free, 0k buffers Swap: 0k total, 0k used, 0k free, 821628k cached (HowTos)