On 6/23/20 6:13 AM, Fredrik Gustafsson wrote:
When building and having a good cache hit, a significant amount of time is
spent in the phase of generating a rootfs, which is really about the
performance of the package manager. ipkg is way slower than deb or rpm.
I was interested enough in your comment here to collect a small sampling
of comparative do_rootfs runs on one of my dev machines.
I used a virgin poky clone and tried to replicate the steps you provided
in your OP, timing only the execution of `bitbake -c do_rootfs
core-image-minimal`. I used the debian `time` package for timing. Here's
what I got:
# Summary
PM Avg do_rootfs time (s)
-- ----------------------
deb 33.89
ipk 33.35
rpm 31.85
# Raw Data
deb 00:33.54
deb 00:34.66
deb 00:33.55
deb 00:33.23
deb 00:34.46
ipk 00:33.96
ipk 00:34.43
ipk 00:33.99
ipk 00:32.17
ipk 00:32.22
rpm 00:29.92
rpm 00:32.31
rpm 00:31.90
rpm 00:33.31
rpm 00:31.80
Based on those results, it seems like all the current PMs are similar in
terms of execution time. Are there major differences between my test
setup and yours? And do you already have a layer with APK available that
I could compare against on my hardware?
This is the crude script I used to automate the test runs:
```
#!/bin/bash
set -euxo pipefail
TIME=/usr/bin/time
recipe=core-image-minimal
# Options are:
# - 'package_deb' for debian style deb files
# - 'package_ipk' for ipk files are used by opkg (a debian style
embedded package manager)
# - 'package_rpm' for rpm style packages
function set_pkg_man() {
pkg_man=${1}
sed -i "s/\(^PACKAGE_CLASSES ?= \)\"\(.*\)\"/\1\"$pkg_man\"/"
conf/local.conf
}
function rebuild_recipe() {
bitbake -c cleanall $recipe
bitbake $recipe
}
function test_recipe() {
local name=${1}
bitbake -c cleansstate $recipe
bitbake -c clean $recipe
$TIME bitbake -c do_rootfs -f $recipe 2>&1 | tee outs/out.$name
}
# rpm
set_pkg_man package_rpm
rebuild_recipe
test_recipe rpm.1
test_recipe rpm.2
test_recipe rpm.3
test_recipe rpm.4
test_recipe rpm.5
# ipk
set_pkg_man package_ipk
rebuild_recipe
test_recipe ipk.1
test_recipe ipk.2
test_recipe ipk.3
test_recipe ipk.4
test_recipe ipk.5
# deb
set_pkg_man package_deb
rebuild_recipe
test_recipe deb.1
test_recipe deb.2
test_recipe deb.3
test_recipe deb.4
test_recipe deb.5
```
Thanks,
--
Alex Stewart
Software Engineer - LabVIEW Real-Time OS
National Instruments
[email protected]
office: +1(512)683-8522
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