Re: Current 'next' won't build => 'cannot allocate memory'

[Michael Tremer <michael.tremer@ipfire.org>]

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Hi,

On Thu, 2018-05-24 at 18:54 +0200, Matthias Fischer wrote:
> Hi,
> 
> On 23.05.2018 13:18, Michael Tremer wrote:
> > I fucked it up again. Sent another patch for builds on 32 bit
> > architectures.
> 
> Don't worry - things happen.
> 
> I just looked and waited for what would come out in the end... ;-)

I think it is working fine now.

Can you remind me again why we picked 70%? Was there a specific reason? Should
we go up to 80 or 90%?

> And during testing I learned a few things about programming, too.
> 
> >   https://git.ipfire.org/?p=ipfire-2.x.git;a=commitdiff;h=212f17c1145bb6978b
> > 4797eb9c805f603ecb1f29
> > 
> > But if this is now running through, I suppose we are ready to call this
> > closed.
> 
> Arne pushed 4.14.43 yesterday, while my 'Devel' was still building
> 'next' from 23. May
> (https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=6b4174133a4cad58db3570d1c
> d1a16b243d4da84)
> and I hadn't the time to look at the results until now.
> 
> For now, its looking good.
> 
> Last build went down from ~319 MB
> (ipfire-2.19.2gb-ext4.i586-full-core121.img.gz) to ~183 MB
> (ipfire-2.19.2gb-ext4.i586-full-core121.img.xz). Minus -136 MB. Not bad.

Yes indeed. There is also no serial image any more. That saves extra space :)

> One thing I noticed: building on a 32bit system led to ~553 additional
> lines in '_build.packages.log', telling me that "xz: Adjusted the number
> of threads from 8 to 3..." Doesn't hurt me yet. I just noticed.

Yes that is expected since the systems cannot use too much memory. But we are
using as many cores as we can which I think is the best.

> > About the planet post: Has anything changed here? Can we release this?
> > 
> >   https://planet.ipfire.org/post/increasing-download-installation-speed-bene
> > fits-of-a-smaller-iso-image
> 
> For me, its ok.

It needs some values in there because I didn't know how much we would save.

When should we release this?

> If you need the latest sizes: I'll build the current 'next' with 4.14.43
> tonight
> (https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=6c9651f6208db27d0daad7a82
> 2c9a511e509fc9c)
> 
> Best,
> Matthias
> 
> > -Michael
> > 
> > On Tue, 2018-05-22 at 20:57 +0100, Michael Tremer wrote:
> > > Hi,
> > > 
> > > yes that was me who broke that then.
> > > 
> > > I just pushed another commit that set this back to 0. Then XZ will
> > > automatically
> > > run as many processes as it has memory for.
> > > 
> > >   https://git.ipfire.org/?p=ipfire-2.x.git;a=commitdiff;h=f03e254f39ddb7ca
> > > cea7a39ec6b98dce77018b0d
> > > 
> > > In addition to that I had to limit memory to 2GB on 32 bit systems. They
> > > cannot
> > > allocate more than that due to their limited address space.
> > > 
> > >   https://git.ipfire.org/?p=ipfire-2.x.git;a=commitdiff;h=a92fb74d1aeb9229
> > > 044c1a9fbc54abafca50da58
> > > 
> > > Let me know if that works for you as well.
> > > 
> > > Best,
> > > -Michael
> > > 
> > > On Tue, 2018-05-22 at 21:05 +0200, Matthias Fischer wrote:
> > > > Hi,
> > > > 
> > > > On 22.05.2018 20:03, Michael Tremer wrote:
> > > > > Hi,
> > > > > 
> > > > > I thought xz was now limited to lower memory.
> > > > 
> > > > Thats what I thought too, but it never worked as I wanted.
> > > > 
> > > > > Could you add -v to see what xz  has decided to do?
> > > > 
> > > > Adding '-v', I've got some weird results.
> > > > 
> > > > 1. Added '-v' in 'make.sh':
> > > >  => "-T$(system_processors) -8 --memory=${XZ_MEM} -v"
> > > > 
> > > > Output:
> > > > 
> > > > ***SNIP***
> > > > ...
> > > >  tar -x -C /tmp -f /ipfire.tar
> > > >     rm -f /ipfire.tar
> > > >     cd /tmp && tar cf - * | xz -T8 -8 --memory=5450MiB -v >
> > > > /install/cdrom/distro.img && rm -rf *
> > > >     xz: Filter chain: --
> > > > lzma2=dict=32MiB,lc=3,lp=0,pb=2,mode=normal,nice=64,mf=bt4,depth=0
> > > >     xz: Using up to 8 threads.
> > > >     xz: 5257 MiB of memory is required. The limit is 5450 MiB.
> > > >     xz: Decompression will need 33 MiB of memory.
> > > >     (stdin): 120.1 KiB / 512.0 KiB = 0.234
> > > >     xz: (stdin): Cannot allocate memory
> > > >     (stdin): 120.1 KiB / 512.0 KiB = 0.234
> > > >     make: *** [cdrom:66: /usr/src/log/cdrom] Error 1...
> > > > ***SNAP***
> > > > 
> > > > Memory limit is higher than required memory but it still says
> > > > 'cannot allocate memory'!?
> > > > And how to handle this (stdin)-message?
> > > > 
> > > > 2. Changed line: XZ_MEM="$(( HOST_MEM * 7 / 10 ))MiB"
> > > > 
> > > > to
> > > > 
> > > > XZ_MEM="$(( HOST_MEM * 9 / 10 ))MiB"
> > > > 
> > > > Output:
> > > > 
> > > > ***SNIP***
> > > > ...
> > > >  rm -f /ipfire.tar
> > > >     cd /tmp && tar cf - * | xz -T8 -8 --memory=7007MiB -v >
> > > > /install/cdrom/distro.img && rm -rf *
> > > >     xz: Filter chain: --
> > > > lzma2=dict=32MiB,lc=3,lp=0,pb=2,mode=normal,nice=64,mf=bt4,depth=0
> > > >     xz: Using up to 8 threads.
> > > >     xz: 5257 MiB of memory is required. The limit is 7007 MiB.
> > > >     xz: Decompression will need 33 MiB of memory.
> > > >     (stdin): 120.1 KiB / 512.0 KiB = 0.234
> > > >     xz: (stdin): Cannot allocate memory
> > > >     (stdin): 120.1 KiB / 512.0 KiB = 0.234
> > > >     make: *** [cdrom:66: /usr/src/log/cdrom] Error 1
> > > > ...***SNAP***
> > > > 
> > > > 3. Using '-T4' and XZ_MEM="$(( HOST_MEM * 7 / 10 ))MiB"
> > > > 
> > > > All is well, log says:
> > > > 
> > > > ***SNIP***
> > > > ...
> > > > tar -x -C /tmp -f /ipfire.tar
> > > > rm -f /ipfire.tar
> > > > cd /tmp && tar cf - * | xz -T4 -8 --memory=5450MiB -v >
> > > > /install/cdrom/distro.img && rm -rf *
> > > > xz: Filter chain: --
> > > > lzma2=dict=32MiB,lc=3,lp=0,pb=2,mode=normal,nice=64,mf=bt4,depth=0
> > > > xz: Using up to 4 threads.
> > > > xz: 2629 MiB of memory is required. The limit is 5450 MiB.
> > > > xz: Decompression will need 33 MiB of memory.
> > > > ...
> > > > ***SNAP***
> > > > 
> > > > Some more infos (helpful?):
> > > > 
> > > > root(a)Devel: /home/matz/ipfire-2.x # xz --info-memory
> > > > Total amount of physical memory (RAM):  7,787 MiB (8,165,179,392 B)
> > > > Memory usage limit for compression:     Disabled
> > > > Memory usage limit for decompression:   Disabled
> > > > 
> > > > root(a)Devel: /home/matz/ipfire-2.x # ulimit -a
> > > > core file size          (blocks, -c) 0
> > > > data seg size           (kbytes, -d) unlimited
> > > > scheduling priority             (-e) 0
> > > > file size               (blocks, -f) unlimited
> > > > pending signals                 (-i) 62187
> > > > max locked memory       (kbytes, -l) 64
> > > > max memory size         (kbytes, -m) unlimited
> > > > open files                      (-n) 1024
> > > > pipe size            (512 bytes, -p) 8
> > > > POSIX message queues     (bytes, -q) 819200
> > > > real-time priority              (-r) 0
> > > > stack size              (kbytes, -s) 8192
> > > > cpu time               (seconds, -t) unlimited
> > > > max user processes              (-u) 62187
> > > > virtual memory          (kbytes, -v) unlimited
> > > > file locks                      (-x) unlimited
> > > > 
> > > > In the meantime I've found an interesting thread about this problem:
> > > > https://www.mail-archive.com/misc(a)openbsd.org/msg144710.html
> > > > 
> > > > "A closer reading of the man page reveals that memory consumption
> > > > is even higher in multi-threaded mode.
> > > > In multi-threaded mode about three times _size_ bytes will be
> > > > allocated in each thread for buffering input and output.
> > > > ...
> > > > A quick check with top(1) confirms that xz in
> > > > multi-threaded mode allocates 1250 MB per thread at compression
> > > > level 9."
> > > > 
> > > > '-8' should be lower per thread, but too much for 8 threads.
> > > > 
> > > > Best,
> > > > Matthias
> > > > 
> > > > > -Michael
> > > > > 
> > > > > On Tue, 2018-05-22 at 18:31 +0200, Matthias Fischer wrote:
> > > > > > Hi!
> > > > > > 
> > > > > > Sorry, but last commit "make.sh: Use all processor cores for
> > > > > > compression" causes the build to break.
> > > > > > 
> > > > > > See
> > > > > > https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=c8453e87599fe66f
> > > > > > 4d18d9
> > > > > > 01bc
> > > > > > 9dc431306afa2d
> > > > > > 
> > > > > > Build stops with:
> > > > > > 
> > > > > > ***SNIP***
> > > > > > ...
> > > > > > rm -f /tmp/ROOTFILES
> > > > > > tar -x -C /tmp -f /ipfire.tar
> > > > > > rm -f /ipfire.tar
> > > > > > cd /tmp && tar cf - * | xz -T8 -8 --memory=5450MiB >
> > > > > > /install/cdrom/distro.img && rm -rf *
> > > > > > xz: (stdin): Cannot allocate memory
> > > > > > make: *** [cdrom:66: /usr/src/log/cdrom] Error 1
> > > > > > ...
> > > > > > ***SNAP***
> > > > > > 
> > > > > > On my machine, 'lsf/cdrom' doesn't like '-T8'. It needed '-T4'.
> > > > > > I experienced this already during my tests.
> > > > > > 
> > > > > > Can anyone confirm?
> > > > > > 
> > > > > > Best,
> > > > > > Matthias
> > > > > > 
> > > > > > P.S.: Hardware is i7/2600 with HT, 8 GB RAM.
> 
>