Jared Cardigan

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May 9, 2019
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What value should the number of kilobyte chunks per compression work unit actually be? Backups regularly cause serious load spikes on a 24-core box with 32gb RAM that normally sits at a load average of 9.0--even with the compression level set below the default of 6, (4) and the number of simultaneous threads set to 1 (the default of 1/core makes me shudder)

cPanel documentation doesn't give any substantial information about how to set this value effectively other than including a default of 4096kb.

What would be the difference in recommended values between, say, a 4mb cache and a 40mb cache? What constitutes "larger" when the (?) mentions:

"Number of kilobyte chunks per compression work unit (Minimum: 128; Maximum: 524,288) [?]
The size (in 1024 byte chunks) of compression work units to be distributed to each pigz process. Default is 4096. Systems with larger L2/L3 caches may benefit from higher values."

Any advice would be welcome.
 

cPanelMichael

Technical Support Community Manager
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Apr 11, 2011
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Backups regularly cause serious load spikes on a 24-core box with 32gb RAM that normally sits at a load average of 9.0--even with the compression level set below the default of 6, (4) and the number of simultaneous threads set to 1 (the default of 1/core makes me shudder)
Hello @Jared Cardigan,

Can you open a support ticket so that one of our Technical Analysts can take a closer look to rule out any additional issues beyond this setting? You can post the ticket number here and we'll link this thread to it.

Thank you.