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Subject: Re: xz-5.2.2: No threaded compression
To: cygwin AT cygwin DOT com
References: <550c836a-b321-b8e4-6fb6-b2e3751f6da1 AT tiscali DOT co DOT uk>
From: Yaakov Selkowitz <yselkowitz AT cygwin DOT com>
Message-ID: <dba125cf-9664-19bc-083f-e3d13560e569@cygwin.com>
Date: Tue, 9 May 2017 19:15:25 -0500
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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.

-- 
Yaakov

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