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

[Geunsik Lim]

It seems that a 'rpmbuild' command only support single-core cpu environment. Can we decompress and compress the binary files  in parallel while executing a rpm packaging operation with 'rpmbuild' command? 

 * The log messages while executing 'rpmbuild' command
```
 
[   46s] + exec rpmbuild --define '_srcdefattr (-,root,root)' --nosignature --target=armv7l-tizen-linux --define '_build_create_debug 1' -ba /home/abuild/rpmbuild/SOURCES/chromium-efl.spec
[   46s] Building target platforms: armv7l-tizen-linux
[   46s] Building for target armv7l-tizen-linux
[   46s] Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.nfcsUa
[   46s] + umask 022
[   46s] + cd /home/abuild/rpmbuild/BUILD
[   46s] + cd /home/abuild/rpmbuild/BUILD
[   46s] + rm -rf chromium-efl-47.2526.69.49
[   46s] + /bin/bzip2 -dc /home/abuild/rpmbuild/SOURCES/chromium-efl-47.2526.69.49.tar.bz2
[   46s] + /bin/tar -xf -
[  161s] + STATUS=0
[  161s] + '[' 0 -ne 0 ']'
[  161s] + cd chromium-efl-47.2526.69.49
[  161s] + /bin/chmod -Rf a+rX,u+w,g-w,o-w .
[  164s] + exit 0
[  164s] Executing(%build): /bin/sh -e /var/tmp/rpm-tmp.JOaBJs
```

As we can see, the rpmbuild uses out-of-date bzip command without  up-to-date  pbzip command. 
Anyone who had similiar experience like me in multi-core CPU(s)? 



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