On 10/05/17 01:15, Yaakov Selkowitz wrote:
On 2017-05-09 18:02, David Stacey wrote:
The man page for xz suggests that threaded compression ought to be
available. However, when I run 'xz --threads=0 <file>' only one CPU core
is used. Is there a way that I can run parallel xz compression in
Cygwin?
WFM. Note from the manpage:
-T threads, --threads=threads
Specify the number of worker threads to use. Setting threads to
a special value 0 makes xz use as many threads as there are CPU
cores on the system. The actual number of threads can be less
than threads if the input file is not big enough for threading
with the given settings or if using more threads would exceed
the memory usage limit.
That's helpful, thank you. The files I'm trying to compress are several
GB, so I suppose I must be hitting the memory limit - which is
surprising, given that I'm on a 64-bit system with a fair amount of RAM.
I'll take a look at the source code and see if I can figure out what
criteria it uses to enable or disable threaded compression.
Thanks again,
Dave.
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