Re: trunk: build error

>> Obviously the error is on a line in the log before what you past.
>>
> I found the error. It was basically not a build error but rather the
> build host ran out of available memory:
> 5073   LZMA    arch/x86/boot/compressed/vmlinux.bin.lzma
> 5074 lzma: (stdin): Cannot allocate memory
>

> > Build host is Debian Squeeze.
>>
>> For me, that build without error on debian squeeze 32bits
>>
> I am running squeeze 64bits in a virtual environment originally with
> 512 MB memory which apparently is to small. Increasing memory to 1024
> MB solved the problem.

Default linux-2.6.32 lzma -9 is a nonsense when just compressing
arch/x86/boot/compressed/vmlinux.bin kernel file, whose size is 3 MB.
lzma -9 could be seen when using make all V=1
Upstream already fixed that when using xz but this is unchanged using lzma.

Adding -vv to the lzma line show that
- with -9
lzma: Filter
chain: --lzma1=dict=64MiB,lc=3,lp=0,pb=2,mode=normal,nice=64,mf=bt4,depth=0
lzma: 674 MiB of memory is required. The limit is 17592186044416 MiB.
lzma: Decompression will need 65 MiB of memory.
  100 %     1234.1 KiB / 3025.2 KiB = 0.408   757 KiB/s       0:03

- without -9, -6 is the default
lzma: Filter
chain: --lzma1=dict=8MiB,lc=3,lp=0,pb=2,mode=normal,nice=64,mf=bt4,depth=0
lzma: 94 MiB of memory is required. The limit is 17592186044416 MiB.
lzma: Decompression will need 9 MiB of memory.
  100 %     1234.1 KiB / 3025.2 KiB = 0.408   774 KiB/s       0:03

So resulting size is the same

- without -9, -6 is the default, adding --lzma1=dict=3MiB help to reduce the
memory requirement
lzma: Filter
chain: --lzma1=dict=3MiB,lc=3,lp=0,pb=2,mode=normal,nice=64,mf=bt4,depth=0
lzma: 38 MiB of memory is required. The limit is 17592186044416 MiB.
lzma: Decompression will need 4 MiB of memory.
  100 %     1234.1 KiB / 3025.2 KiB = 0.408   775 KiB/s       0:03

Resulting size is again the same, and dictionary size equal the file to be
compressed is the maximun that should be used with a result.

I try adding nice=273,depth=512 lzma options that Lasse advised us to use
for the floppy compression but see no change, so this is good enought with
only --lzma1=dict=3MiB

Gilles


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