On Tue, Sep 28, 2021 at 03:43:53PM +0200, Mauro Carvalho Chehab wrote: > Em Tue, 28 Sep 2021 14:27:39 +0200 > Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> escreveu: > > > Em Tue, 28 Sep 2021 13:04:22 +0200 > > Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> escreveu: > > > > > On Tue, Sep 28, 2021 at 12:14:01PM +0200, Mauro Carvalho Chehab wrote: > > > > Hi Greg, > > > > > > > > As promised on > > > > > > > > https://lore.kernel.org/lkml/20210928120304.62319fba@xxxxxxxx/T/#u > > > > > > > > I'm adding progress info when get_abi.pl is checking for undefined ABI symbols > > > > on patches 1 and 2. > > > > > > > > That will help not only to identify what is causing delays on the script, but also > > > > to notify the user that processing it could take some time on some systems. > > > > > > > > If you run it on your big server with: > > > > > > > > scripts/get_abi.pl undefined 2>logs > > > > > > > > The "logs" file will contain timestamps relative to the time the script started to > > > > do the regex matches for sysfs files. It should be printing one line every > > > > time the progress completes 1% or one second after the last progress output. > > > > > > Adding more debugging and tweaking the script a bit to show the file it > > > is about to check, not the one it finished checking, > > > > Feel free to modify the script and add such debug/tweaks if you find > > it useful. > > > > > I got the following > > > debug output that seems to pinpoint the problem file. > > > > > > The sysfs file that is causing problems is: > > > /sys/devices/pci0000:40/0000:40:00.2/iommu/ivhd1/amd-iommu/cap > > > > > > > Btw, I just got an arm64 server with 128 CPUs for testing. I'm trying > > to allocate also a big x86 server here, but I'm not sure if it is AMD or > > Intel. > > Some tests on a Gigabyte R182-Z91-00 server, equipped with AMD EPYC 7352 > 24-Core Processors (total 96 threads): > > $ find /sys |wc -l > 233981 > > $ time ./scripts/get_abi.pl undefined >undefined 2>logs > > real 0m38.917s > user 0m34.554s > sys 0m4.292s > > PS.: this machine doesn't have anything at /sys/class/iommu. > > On a Huawei TaiShan 200 (Model 2280) with 128 ARM cores: > > $ find /sys |wc -l > 99362 > $ time ./scripts/get_abi.pl undefined >undefined 2>logs > > real 0m29.311s > user 0m26.173s > sys 0m3.061s > > Both machines are using Perl 5.26. Try it with your sorting patch, that fixed it for me and now it runs in 10 seconds. crazy.
