What are your kernel compile times?

jonathon · November 26, 2021, 4:11pm

£1200 laptop from four years ago:

£20k server from 2019:

New £1300 laptop:

real    0m40.083s
user    8m57.941s
sys     0m48.364s

538.61s user 48.13s system 1492% cpu 39.319 total

I mean… talk about an upgrade.

$ inxi -Cm
Memory:    RAM: total: 13.58 GiB used: 6.42 GiB (47.3%) 
           RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:       Info: 8-Core model: AMD Ryzen 7 5800H with Radeon Graphics bits: 64 type: MT MCP cache: L2: 4 MiB 
           Speed: 1397 MHz min/max: 1200/3200 MHz Core speeds (MHz): 1: 1397 2: 1401 3: 1978 4: 2693 5: 1932 
           6: 1886 7: 3163 8: 2022 9: 1397 10: 1397 11: 1400 12: 1540 13: 3985 14: 1396 15: 2845 16: 1397

ricklinux · November 26, 2021, 4:20pm

real 1m55.727s
user 25m16.033s
sys 2m15.099s
[ricklinux@eos-kde linux-5.15.5]$

ricklinux · November 26, 2021, 4:24pm

That’s cheating!

pebcak · November 26, 2021, 7:11pm

The process seems to error out on me
The last few lines of the output:

make: *** [Makefile:1175: prepare0] Error 2
make: *** Waiting for unfinished jobs....

real	0m2.018s
user	0m8.092s
sys	0m2.132s

Full output

[pebcak@enos-gnome linux-5.8.3]$ make mrproper
[pebcak@enos-gnome linux-5.8.3]$ make defconfig
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
HOSTCC scripts/kconfig/confdata.o
HOSTCC scripts/kconfig/expr.o
LEX scripts/kconfig/lexer.lex.c
YACC scripts/kconfig/parser.tab.[ch]
HOSTCC scripts/kconfig/lexer.lex.o
HOSTCC scripts/kconfig/parser.tab.o
HOSTCC scripts/kconfig/preprocess.o
HOSTCC scripts/kconfig/symbol.o
HOSTCC scripts/kconfig/util.o
HOSTLD scripts/kconfig/conf
*** Default configuration is based on ‘x86_64_defconfig’

configuration written to .config

[pebcak@enos-gnome linux-5.8.3]$ time(make -j$(nproc))
SYSTBL arch/x86/include/generated/asm/syscalls_32.h
SYSTBL arch/x86/include/generated/asm/syscalls_64.h
SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h
SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h
WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h
WRAP arch/x86/include/generated/uapi/asm/errno.h
WRAP arch/x86/include/generated/uapi/asm/fcntl.h
WRAP arch/x86/include/generated/uapi/asm/ioctl.h
WRAP arch/x86/include/generated/uapi/asm/ioctls.h
WRAP arch/x86/include/generated/uapi/asm/ipcbuf.h
WRAP arch/x86/include/generated/uapi/asm/param.h
WRAP arch/x86/include/generated/uapi/asm/poll.h
WRAP arch/x86/include/generated/uapi/asm/resource.h
WRAP arch/x86/include/generated/uapi/asm/sockios.h
WRAP arch/x86/include/generated/uapi/asm/termbits.h
WRAP arch/x86/include/generated/uapi/asm/socket.h
WRAP arch/x86/include/generated/uapi/asm/termios.h
WRAP arch/x86/include/generated/uapi/asm/types.h
HOSTCC arch/x86/tools/relocs_32.o
HOSTCC arch/x86/tools/relocs_64.o
HOSTCC arch/x86/tools/relocs_common.o
WRAP arch/x86/include/generated/asm/early_ioremap.h
WRAP arch/x86/include/generated/asm/export.h
WRAP arch/x86/include/generated/asm/dma-contiguous.h
WRAP arch/x86/include/generated/asm/mm-arch-hooks.h
WRAP arch/x86/include/generated/asm/irq_regs.h
WRAP arch/x86/include/generated/asm/mcs_spinlock.h
WRAP arch/x86/include/generated/asm/mmiowb.h
UPD include/config/kernel.release
UPD include/generated/uapi/linux/version.h
HOSTCC scripts/kallsyms
HOSTCC scripts/sorttable
HOSTCC scripts/asn1_compiler
HOSTCC scripts/extract-cert
HOSTCC scripts/selinux/genheaders/genheaders
HOSTCC scripts/selinux/mdp/mdp
UPD include/generated/utsrelease.h
DESCEND objtool
HOSTCC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/fixdep.o
HOSTLD /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/fixdep-in.o
LINK /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/fixdep
HOSTLD arch/x86/tools/relocs
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/exec-cmd.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/help.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/pager.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/parse-options.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/run-command.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/sigchain.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/subcmd-config.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/weak.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/special.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/check.o
MKDIR /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/arch/x86/lib/
GEN /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/arch/x86/lib/inat-tables.c
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/orc_gen.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/orc_dump.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/arch/x86/decode.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/builtin-check.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/builtin-orc.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/elf.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/objtool.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/libstring.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/libctype.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/str_error_r.o
CC /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/librbtree.o
LD /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/libsubcmd-in.o
AR /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/libsubcmd.a
LD /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/arch/x86/objtool-in.o
HOSTCC scripts/mod/mk_elfconfig
CC scripts/mod/devicetable-offsets.s
CC scripts/mod/empty.o
UPD scripts/mod/devicetable-offsets.h
MKELF scripts/mod/elfconfig.h
HOSTCC scripts/mod/modpost.o
HOSTCC scripts/mod/sumversion.o
HOSTCC scripts/mod/file2alias.o
HOSTLD scripts/mod/modpost
CC kernel/bounds.s
CALL scripts/atomic/check-atomics.sh
/bin/sh: line 1: bc: command not found
make[1]: *** [Kbuild:24: include/generated/timeconst.h] Error 127
make[1]: *** Waiting for unfinished jobs…
LD /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/objtool-in.o
LINK /home/pebcak/KernetTest/linux-5.8.3/tools/objtool/objtool
make: *** [Makefile:1175: prepare0] Error 2
make: *** Waiting for unfinished jobs…

real 0m2.018s
user 0m8.092s
sys 0m2.132s

Am I doing something wrong?

ricklinux · November 26, 2021, 7:14pm

What commands are you using?

pebcak · November 26, 2021, 7:16pm

These from @alenbasic

It’s hidden under the “Full output” in my previous post.

ricklinux · November 26, 2021, 7:16pm

Hmm…same here?

ricklinux · November 26, 2021, 7:17pm

It seems too quick anyway.

pebcak · November 26, 2021, 7:18pm

Yeah, shockingly so! Then I looked at the output…

ricklinux · November 26, 2021, 7:18pm

You got it already?

pebcak · November 26, 2021, 7:36pm

make: *** [Makefile:1175: prepare0] Error 2`

Line 1173-1175 in MakeFile:

prepare0: archprepare
	$(Q)$(MAKE) $(build)=scripts/mod
	$(Q)$(MAKE) $(build)=.

Does anyone have some idea what might be wrong?

ricklinux · November 26, 2021, 9:20pm

I just ran it again and i got no times?

Kernel: arch/x86/boot/bzImage is ready (#1)

jonathon · November 27, 2021, 3:17am

Do you have base-devel installed? (also bc is a separate command but I’m surprised if it’s needed for compiling the kernel).

Yup. In process of installing and getting everything tweaked. I’m going to try dual-booting this one so I might be able to play with VR (ALVR didn’t work when I tried it).

Already, it’s surprising how much smoother, quieter, and cooler everything is. (my past three laptops have had constant fan noise, and then this one… so quiet).

pebcak · November 27, 2021, 10:40am

Thanks for the reply!

I had all the packages in base-devel already installed but not bc (I missed this /bin/sh: line 1: bc: command not found )

Now here is my not so flattering time:

real 2m28.705s|
user 33m34.890s
sys 3m49.538s

with:

$ inxi -Cm
Memory:    RAM: total: 15.07 GiB used: 2.48 GiB (16.5%)
           RAM Report: permissions: Unable to run dmidecode. Root privileges required.
CPU:       Info: 8-Core model: AMD Ryzen 7 4800U with Radeon Graphics bits: 64 type: MT MCP cache: L2: 4 MiB
           Speed: 3250 MHz min/max: 1400/1800 MHz Core speeds (MHz): 1: 3250 2: 3973 3: 3115 4: 4158 5: 1848
           6: 2770 7: 3203 8: 2418 9: 1462 10: 1416 11: 1866 12: 1404 13: 4182 14: 1480 15: 2548 16: 1657

pebcak · November 27, 2021, 10:46am

Is this one you linked to before?

jonathon · November 27, 2021, 2:27pm

This is far too slow for that processor - are you compiling on a 5400rpm HDD? Try again with it in RAM (e.g. extract under /tmp or /dev/shm), pretty sure it shouldn’t be slower than my old laptop…

MrToddarama · November 27, 2021, 3:19pm

This makes a big difference … I ran on one of my laptops with the files on nvme drive:

real	1m50.345s
user	12m38.686s
sys	    1m5.072s

versus in a RAM drive:

real	1m15.071s
user	8m38.415s
sys	    0m45.800s

same hardware for both runs…

Memory:    RAM: total: 15.49 GiB used: 3.39 GiB (21.9%)
           RAM Report: permissions: Unable to run dmidecode. Root privileges required.
CPU:       Info: Quad Core model: Intel Core i7-8550U bits: 64 type: MT MCP cache: L2: 8 MiB
           Speed: 3701 MHz min/max: 400/4000 MHz Core speeds (MHz): 1: 3701 2: 3705 3: 3708 4: 3700 5: 3700 6: 3705 7: 3706
Drives:    Local Storage: total: 4.34 TiB used: 1.26 TiB (29.0%)
           ID-1: /dev/nvme0n1 vendor: Intel model: SSDPEKKW512G7 size: 476.94 GiB speed: 31.6 Gb/s lanes: 4 type: SSD
           serial: <filter> rev: PSF109C temp: 21.9 C scheme: MBR

pebcak · November 29, 2021, 11:22am

Thanks @jonathon!
The machine has an M.2 SSD.
I’ll redo the test as per your suggestion later on an post the result.

Joseph · November 29, 2021, 12:11pm

A year later. 4800HS

real 0m45.835s
user 9m58.770s
sys 1m3.239s

Stephane · January 8, 2022, 10:05pm

this will change in few weeks

start your engine …