Hi,
On 06.02.2018 02:05, Michael Tremer wrote:
... ((XZ_MEM=(($HOST_MEM)/10)*7)) && XZ_MEM=${XZ_MEM}MiB
You can write this even short:
XZ_MEM="$(( HOST_MEM * 7 / 10 ))MiB"
Oneliner! Yes. I was looking for something like that... ;-)
I swapped the order of the multiplication and division so that you would have a more exact result.
For example if you system has 1024 MB or RAM, you divide this by 10 (102) and then multiply by 7 which gives you 714. The other order is 1024 * 7 = 7167 and then divided by 10 is 716 which is closer to the actual result of 716.8. Shouldn't matter here but just in general this is better :)
Thanks, looks better - noted for the next time!
Now it looks like this ('make.sh'):
... # Host memory is ok, calculating XZ memory XZ_MEM="$(( HOST_MEM * 7 / 10 ))MiB" XZ_OPT="--threads=0 -8 $XZ_MEM" echo XZ-Memory: $XZ_MEM echo XZ-Options: $XZ_OPT echo "XZ memory size is OK (must be at least 700MiB), starting build..." ... ["echoes" for debugging!]
This is working. '$XZ_OPT' now gives me: --threads=0 -8 5450MiB
But. ;-)
You can put this probably next under "HOST_MEM=$(system_memory)" and then export this to the internal shell by adding the variable to lfsmake2 for the disk image and ipfiredist for the packages.
Sorry, I must confess that I don't know exactly how to do this. As I wrote: "How do I pass the 'XZ_MEM'-variable to 'cdrom' and 'Config'?" Or in this case, XZ_OPT!?
Then in lfs/cdrom and lfs/Config for the dist target, you just need to add the parameters to the command line.
In 'Config' I changed:
... cd /install/packages/package/tmp/ && XZ_OPT=-T0 tar -c -p --numeric-owner -J -f /install/packages/package/files.tar.xz * ...
To: ... cd /install/packages/package/tmp/ && $XZ_OPT tar -c -p --numeric-owner -J -f /install/packages/package/files.tar.xz * ...
Maybe it is a good idea to have a variable XZ_OPT that adds everything together and is then used in both places.
I added the other xz-options and created XZ_OPT as shown above, but in 'cdrom' there is an 'export XZ_OPT = ...'-line and I don't know how to handle these line. Is it still necessary?
Do I have to 'export' the XZ_OPT'-variable in 'make.sh'?
And how do I "add" this variable to 'lfsmake2' and 'ipfiredist'(-function)?
Sorry if these questions sound simple, but I'm guessing a bit too much while trying to get a grip on this.
Best, Matthias
Best, -Michael
...
Looks better.
Best, Matthias
On 03.02.2018 20:44, Matthias Fischer wrote:
Hi,
On 30.01.2018 21:03, Michael Tremer wrote:
Hi,
...
I'll consider how I would do this and send it in as soon as I get a grip on it.
Well, I added some functions already somewhere. I suppose you just need to do the maths to set that to X% of the host system which is just a simple multiplication of the output of ${HOST_MEM} in make.sh.
Ok, I take my heart in my hand. Here are my first results - but remember, I'm not familiar with this. I built a short test script which looks as if it is working as wanted, but...
And that needs to be passed to the lfs scripts that are supposed to make the images.
...this is a problem I'm struggling with right now: How do I pass the 'XZ_MEM'-variable to 'cdrom' and 'Config'?
I think this can be done using 'export XZ_MEM' or something else but I'm not sure.
This is the script I'm testing with:
***SNIP*** #!/bin/bash
system_memory() { local key val unit
while read -r key val unit; do case "${key}" in MemTotal:*) # Convert to MB echo "$(( ${val} / 1024 ))" break ;; esac done < /proc/meminfo }
HOST_MEM=$(system_memory)
# Checking host memory if [ $HOST_MEM -ge 1024 ]; then echo Host-Memory: $HOST_MEM'MiB' echo "Host memory is OK (must be at least 1024MiB), starting build." else echo Host-Memory: $HOST_MEM'MiB' echo "Host memory too low (less than 1024MiB), building stopped." exit 1 fi
# Host memory is ok, calculating needed XZ memory to about 70% of host memory ((XZ_MEM=(($HOST_MEM)/10)*7)) XZ_MEM=$XZ_MEM'Mib' echo XZ-Memory: $XZ_MEM echo "XZ memory size is OK (must be at least 700MiB), starting build." ***SNAP***
The 'echoes' are mostly for debugging.
Calculation looks ok, 'MiB' must added without blanks (XZ man page: "In most places where an integer argument is expected, an optional suffix is supported to easily indicate large integers. There must be no space between the integer and the suffix.")
Please send questions where ever you need help. There is no reason to do this alone.
Please see above:
- Is this code what you where thinking of? I would leave the other
parameters as they are (--threads=0 -8).
- Where should I add such code in the first place? I'd like to start with
'make.sh', so building stops as soon as possible if there is not enough memory. Where's the best place? Right after function 'system_memory() {...}'?
- How to I pass contents of 'XZ_MEM' to 'cdrom' and 'Config'?
I consider something like: ... export XZ_OPT = --threads=0 -8 --memory=$XZ_MEM ...
Best, Matthias
Best, -Michael
Best, Matthias
Best, -Michael
On Wed, 2017-11-22 at 16:37 +0000, Michael Tremer wrote: > Hi, > > On Tue, 2017-11-21 at 18:35 +0100, Matthias Fischer wrote: > > Hi, > > > > On 21.11.2017 15:42, Michael Tremer wrote: > > > Hello, > > > > > > any progress on this? > > > > Not much, because I've been struggling with a flu for the past > > two > > weeks, and its not over yet, but: > > > > In the meantime I ran several builds with different parameters. > > > > IMHO we could use: > > > > 'export XZ_OPT = --threads=0 -8 --memory=700MiB' > > > > in 'lfs/cdrom' > > > > and > > > > cd /install/packages/package/tmp/ && XZ_OPT="-T0 -8 -- > > memory=700MiB" tar > > -c > > -p > > --numeric-owner -J -f /install/packages/package/files.tar.xz * > > > > in 'lfs/Config'. > > > > Using '9' or '--extreme'-parameter brought no further > > improvements, > > on the other hand, build time and RAM consumption increased > > strongly. With '-8', minimal RAM consumption was about 680 MiB, > > using > > '700 Mib' was always safe. So this is the minimum I would > > recommend. > > Yes, I observed the same thing. -9 compresses a little bit better > and > extreme > doesn't change a bit. > > -8 seems to be optimal since it won't require too much memory to > decompress > either. So let's go with that. > > > Results: > > > > (Buildtime: 5 hours 20 minutes 59 seconds) > > > > 255866764 ipfire-2.19.1gb-ext4.i586-full-core117.img.gz > > 252262006 ipfire-2.19.1gb-ext4-scon.i586-full-core117.img.gz > > 175112192 ipfire-2.19.i586-full-core117.iso > > > > > -Michael > > > > > > On Tue, 2017-11-07 at 22:47 +0000, Michael Tremer wrote: > > > > Hi, > > > > > > > > On Tue, 2017-11-07 at 19:41 +0100, Matthias Fischer wrote: > > > > > Hi, > > > > > > > > > > On 07.11.2017 16:05, Michael Tremer wrote: > > > > > > Hi, > > > > > > > > > > > > maybe this function helps: > > > > > > > > > > > > https://git.ipfire.org/?p=ipfire-2.x.git;a=commitdiff;h= > > > > > > 51 > > > > > > 90eea2 > > > > > > 4f98 > > > > > > 22 > > > > > > a63d > > > > > > c5d06d214b48f973b14f29 > > > > > > > > > > Thanks. I'll take a look... > > > > This would help, indeed, but how to implement(!?), and... (see > > below) > > Just run it somewhere in the script, figure out what is about 80% > of > that > and > if > that is smaller than 800 MB, we should just fail. > > It would be good to have a function that determines the xz > parameters and > we > use > that where ever we call xz. We don't want any duplicated code. > > > > > > > On Tue, 2017-11-07 at 10:46 +0000, Michael Tremer wrote: > > > > > > > On Mon, 2017-11-06 at 22:09 +0100, Matthias Fischer > > > > > > > wrote: > > > > > > > ... > > > > > > > > > > > > > > > > I forgot: Tuning the XZ-parameters... ;-) > > > > > > > > > > > > > > Good that you are bringing this up. So I think what we > > > > > > > should > > > > > > > do > > > > > > > here is > > > > > > > bringing back XZ compression with -8 so that we do not > > > > > > > waste > > > > > > > too > > > > > > > much > > > > > > > space > > > > > > > when > > > > > > > extracting the image again. > > > > > > > > > > Right now I'm testing how much RAM I need. > > > > > > > > > > Current 'next'-build is running with: > > > > > > > > > > 'lfs/cdrom': > > > > > ... > > > > > export XZ_OPT = --threads=0 -8 --memory=500MiB > > > > > ... > > > > > > > > > > 'lfs/Config': > > > > > ... > > > > > cd /install/packages/package/tmp/ && XZ_OPT="-T0 -8" ... > > > > > ... > > > > > > > > > > I'm waiting for the results. Takes a while. > > > > > > > > You can just run it like this and it will tell you: > > > > > > > > [ms@hughes ~]$ xz -vv8 -T0 > > > > xz: Filter chain: -- > > > > lzma2=dict=32MiB,lc=3,lp=0,pb=2,mode=normal,nice=64,mf=bt4,d > > > > ep > > > > th=0 > > > > xz: Using up to 4 threads. > > > > xz: 2,629 MiB of memory is required. The limiter is > > > > disabled. > > > > xz: Decompression will need 33 MiB of memory. > > > > xz: Compressed data cannot be written to a terminal > > > > xz: Try `xz --help' for more information. > > > > > > > > > > > To not run into memory limits we should detect how > > > > > > > much > > > > > > > memory > > > > > > > the > > > > > > > build > > > > > > > host > > > > > > > has and set the memory limit to maybe 80% of that. xz > > > > > > > will > > > > > > > then > > > > > > > automatically > > > > > > > scale down to a number of parallel processes that it > > > > > > > can > > > > > > > fit > > > > > > > into > > > > > > > memory. > > > > This is something I couldn't get to work. First, I couldn't > > specify not > > less > > than '700 MiB'. If I specify '600 MiB', building stops and tells > > me it > > needs > > at least about 680 MiB. If I use '70%', building stops. And I > > never saw > > that > > 'xz' "automatically scaled down". It just stopped everytime. > > Yes, ~700M is the minimum. > > It will just reduce the number of threads again to make sure > everything > fits > into memory. > > > > > > > > I'm a bit puzzled about this: I tried using '--memory=70%' > > > > > as > > > > > mentioned > > > > > in the xz man pages, but is seems to have no effect. It > > > > > looks as > > > > > if > > > > > the > > > > > percent parameter isn't recognized and ignored. It always > > > > > ends up > > > > > in > > > > > "cannot allocate memory". Any hints on this? Do both > > > > > 'lfs/cdrom' > > > > > AND > > > > > 'lfs/Config' need the '--memory'-parameter? > > > > This was the next problem: 'percent'-parameter does not work as > > expected. > > No, don't use it. Just determine yourself what it is. > > I think we could even try to set 100% of the memory, because as > far > as I > can > see > this is worst case and xz won't use everything that we allow. > > If that does't work, let's scale down to 90%, or 80%, etc... > > > > > Yes, but it would be good to have one place where the > > > > parameters are > > > > being generated and then we just use them from a variable. > > > > Probably beyond my capabilities for the moment. Any thoughts? > > > > > > > > > ... > > > > > > > We will at least need about half a GB which should be > > > > > > > a > > > > > > > sensible > > > > > > > requirement > > > > > > > for a build system any ways. > > > > I'm afraid '500 MiB' are not enough... > > No, so we will now make 1G the minimum for a build. > > I tried to build the OS on an ARM board with only 512MB of RAM the > other > day > and > even with a lot of swap it doesn't work. So we are past this any > way. > > > > > > > > Agreed. Because of this I'm testing with '500Mib'. > > > > > > > > > > > > Will you work on this bringing it into the build > > > > > > > system?! > > > > > > > > > > "I'll do my very best!" :-)) > > > > > > > > Very well Miss Sophie... > > > > ... > > > > Best™, > > Matthias > > -Michael