Re: Better way to handle apt cache needed

["Roberto A. Foglietta" <roberto.foglietta@gmail.com>]

On Thu, 19 Jan 2023 at 19:08, Roberto A. Foglietta
<roberto.foglietta@gmail.com> wrote:
>
> Hi all,
>
> Thanks to Uladzimir who pointed me out about the weirdness of ln -P in sbuild
> and other changes that I made, nvpriv7 is clearly faster than npriv6. Here
> below the benchmarks compared with the original based on robang74:next.
>
> Thanks to Uladzimir who pointed me out about the weirdness of ln -P in sbuild
> and other changes that I made, nvpriv7 is clearly faster than npriv6. Here
> below the benchmarks compared with the original based on robang74:next.
>
>         devel2 (public) + npriv7 (private)
>        ------------------------------------
>             fresh              cache
>        ------------ basic-os --------------
>         3745 Mb (max)   |  3182 Mb (max)
>         2849 Mb (rest)  |  2289 Mb (rest)
>         3596 Mb (deb)   |  3596 Mb (deb)
>          806 Mb (wic)   |   806 Mb (wic)
>          551 Mb (cache) |   551 Mb (cache)
>        time:  2m39s     | time:    30s       5.30x

This 2m39s is wrong: it refers to a reduced image that I created for
test and I committed some hours ago

https://github.com/robang74/isar-nvidia-debian/commit/7ea25b486484b2f675bc1a94098dd22fb08594f0

The real number is 3m6s for the current npriv.8 - while 30s has been
reduced at 28s. Sorry for the mistake, my fault.

>        ------------ original ---------------------
>        time:  7m58s     | time:  2m17s       3.48x
>               3.00x     |        4.57x
>                         |
>        ------------ complete --------------
>        33197 Mb (max)   | 28209 Mb (max)
>        23964 Mb (rest)  | 18982 Mb (rest)
>         3596 Mb (deb)   |  3596 Mb (deb)
>         9143 Mb (wic)   |  9139 Mb (wic)
>         4916 Mb (cache) |  4916 Mb (cache)
>        time: 12m45s     | time:  4m11s       3.05x
>        ------------ original ---------------------
>        time: 21m17s     | time:  8m28s       2.51x
>               1.67x     |        2.02x
>
> About the complete image, we need to consider some fixed times like these:
>
> * time to produce complete wic image: 2m23s
> * time to compile nvidia drivers: 2m8s
>
> Because these times cannot be shrink as part of the building process then we can
> subtract that times (for the cache just producing the image because the drivers
> are cached) and revise the benchmarks as following:
>
>             fresh              cache
>        ------------ complete --------------
>        time:  8m14s     | time:  1m48s       4.57x
>        ------------ original ---------------------
>        time: 16m46s     | time:  6m05s       2.76x
>               2.03x     |        3.38x
>
> Even in the worst case, the building performances has been increased by 2x
>
> Best regards, R-



-- 
Roberto A. Foglietta
+49.176.274.75.661
+39.349.33.30.697