[Rpm-maint] [rpm-software-management/rpm] Does not the rpmbuild command execute (de)compression of files in parallel? (#113)

[Geunsik Lim]

> It is the decision of the distributions to support them and change the macros accordingly. 
> Upstream may follow the consensus of the distributions later.

Right. However, I hope that rpm upstream will enable multi threaded xz compression by default for them. :) For example, 

```
# https://fedoraproject.org/wiki/Features/XZRpmPayloads
%define _compression_level    7
%define _smp_mflags -j%(echo "`/usr/bin/getconf _NPROCESSORS_ONLN`")
%_source_payload   w%{_compression_level}T%{_smp_mflags}.xzdio
%_binary_payload   w%{_compression_level}T%{_smp_mflags}.xzdio
```

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