Hello! On Wed, May 18, 2022 at 9:03 PM Matías Fonzo <s...@dragora.org> wrote: > > El 2022-05-17 03:04, DustDFG escribió: > > Hello! > > > > I want to know why you use tarlz. If I right understand, you use tarlz > > archive format (not usual tar.lz or something else) because it has > > multi-threaded facilities. Am I right? > > Not only for the multi-thread capabilities, which speeds up the checking > of a tarball when testing it, there are a number of reasons, one of them > is that tarlz creates a more secure format than the one proposed by > POSIX pax format; tarlz is based on the lzip format, its inclusion is a > decision that was made for Dragora in 2008. Now expanded elsewhere, it > is the only reliable format that I know of. > > > I read the source code of qi and found that qi uses tarlz with option > > --solid. It means that tarlz can't unpack this archive with using > > multi-threading [1] [2]. > > This does not mean that it can be done in the future, I understand that > it is not easy to implement. Beyond implementation, --solid is the > recommended option for packages, as it is the final product. >
I am not sure that it is difficult to implement. We can just create variable tarlz_compression_granularity and and use it instead of --solid. I propose something like this: tarlz_compression_granularity="--solid" or tarlz_compression_granularity="--no-solid" ... ( umask 022 ; tarlz $tarlz_compression_granularity -9 $tarlz_opts -cvf - -- * ) > > I understand that you want to get the > > smallest possible size of an archive. If I have a fully empty disk > > with 1TB capacity, I may want to get more speed especially if I build > > packages for testing (not for release)... > > And this has been optimized in Dragora, not to mention that it is also > subject to build systems, hardware, parallel jobs for the compiler.... > I am not sure that I understood it correctly. As I know, qi waste some time at build time. When I want to build package and install it for example with the following command `qi build -i`, qi produces the tlz package and then installs it (unpack). It is visibly when you build kernel package.... > > I want to propose you to add to qi possibility to point compression > > granularity level through new option or maybe through qirc file. Note: > > I don't propose to change default compression granularity level. I > > simply want to have a possibility to change it when I want it. > > > > [1] https://www.nongnu.org/lzip/manual/tarlz_manual.html#Introduction > > [2] > > https://www.nongnu.org/lzip/manual/tarlz_manual.html#Multi_002dthreaded-decoding > > Let's see what our friend, the author, has to say. :-) > Do you talk about the author of tarlz? (Antonio Diaz Diaz)
