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jehreg
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Joined: 28 Apr 2002
Posts: 8
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 Posted: Thu Oct 02, 2003 7:22 pm Post subject: Compiling Kernel with Distcc - A HOWTO |
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I've been gooffing around with distcc (booting all my machine with a custom LiveCD I've just done, more on this later...) and looking at my emerges zip by....
Then I wondered how much faster a kernel compile would go with distcc.
I could not find a thread in the forums on how do to this, so after a bit of tweaking, voila:
CC="distcc gcc" make -e -j 7 dep
CC="distcc gcc" make -e -j 7 bzImage
make bzImage
The last step is necessary because the compile borks in its last steps if distcc is used (which is when the kernel is all finally linked I think).
Since all the .o files are now compiled, the last "make bzImage" just zooms by and links everything.
Tell me if it works for ya.
Pat |
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MrWorf
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Joined: 18 Jan 2003
Posts: 57
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| Posted: Thu Oct 02, 2003 8:46 pm Post subject: |
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Haven't done it yet (but I will, rest assured  ) just a quick note for those not familiar with make but still wanting to give it a try.
The "-j 7" option tells it how many processes to run in parallel.
So, if you have 5-7 cpu:s available (in one machine or over a network, as in the distcc case) "-j 7" is advisable, otherwise, a good hint is to use a value of: <number of cpus> + 1
Which in my case happens to be 5 (3 servers + workstation) ... Now, if we only could make a patch for the kernel emerge that automatically made the kernel compile scripts honour the settings in make.conf  |
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pilla
Administrator
Joined: 07 Aug 2002
Posts: 7184
Location: Pelotas, BR
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| Posted: Thu Oct 02, 2003 9:01 pm Post subject: |
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to Documentation, Tips & Tricks
_________________
"I'm just very selective about the reality I choose to accept." -- Calvin |
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kerframil
l33t
Joined: 19 Apr 2002
Posts: 701
Location: London, UK
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| Posted: Tue Oct 14, 2003 7:06 pm Post subject: |
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I've always used the following method: | Code: | # make dep && make clean
# export DISTCC_HOSTS="<insert hosts here>"
# make CC="distcc" -j3 bzImage
# make CC="distcc" -j3 modules
# make modules_install |
Also, I have been in a few situations where I end up with highly erratic and malfunctioning kernels when using -j5 or higher. So, unless it can be proven that is is absolutely safe now, I would suggest <= -j4. |
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phattmatt
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Joined: 01 Jun 2003
Posts: 33
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| Posted: Mon Oct 20, 2003 2:03 pm Post subject: |
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Hi all,
Since I like using genkernel I did a quick hack to enable distcc compiling.
WARNING - Insert standard "Please take care, I will not be held responsable" warning here - WARNING
I assume you have disttcc and genkernel installed and working.
Edit the genkernel script (which on my box was found at '/usr/sbin/genkernel', HINT: run 'which genkernel' to check the location)
Find the lines which read:
| Code: | make dep >/var/log/genkernel.log 2>&1 ||die; eend
make $MAKEOPTS bzImage >/var/log/genkernel.log 2>&1 || die; eend
make $MAKEOPTS modules >/var/log/genkernel.log 2>&1 || die; eend
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(HINT: The above lines are in the 'compile()' section)
and add 'CC="distcc"' after the make command word, like so:
| Code: | make CC="distcc" dep >/var/log/genkernel.log 2>&1 ||die; eend
make $MAKEOPTS CC="distcc" bzImage >/var/log/genkernel.log 2>&1 || die; eend
make $MAKEOPTS CC="distcc" modules >/var/log/genkernel.log 2>&1 || die; eend
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Save, and run genkernel. To see if it's working use the distccmon-text command.
I've compiled a grand total of one kernel with this modification (gentoo-sources 2.4.20-r7) which worked fine. This is the extent of my testing.
Good Luck 
Matt. |
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Documentation, Tips & Tricks
