I am using xz 5.2.1 (compiled from source) on Debian Jessie.

$ xz --version
xz (XZ Utils) 5.2.1
liblzma 5.2.1

When I run parallel compress I see all cores utilized (checked with htop).

xz -T 0 2275.dat

However, when I attempt to run parallel decompress I only see a single
core utilized.

xz -d -T 0 2275.dat.xz

The file I'm working with is sufficiently large (2.3G compressed ; 46G
uncompressed) that I would expect significant benefit from
decompression parallelism.

I noticed that a few other users in the phoronix forum [1] were seeing
similar behavior. Am I missing something obvious?



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