Upper limit on make -j ?

[Brian]

Isn't 1000 an unrealistically high value?

Brian


On Tue, 27 Nov 2007, Bruce Cran wrote:

> Pieter de Goeje wrote:
>> On Tuesday 27 November 2007, Andy Greenwood wrote:
>>> Aryeh Friedman wrote:
>>>> Before I file a PR I just want to know if it is worth it to file a PR
>>>> for:
>>>> 
>>>> make -j1000 buildworld buildkernel installkernel
>>>> seg faulting
>>> I thought that the kernel builds couldn't be built using parallel jobs,
>>> that it might break something. Is that not true?
>> In my experience parallel kernel builds are fine. I think (wild guess) the 
>> OP is running out of memory and somewhere in make or gcc the return value 
>> of malloc() isn't checked.
>> 
>> -
>> Pieter de Goeje
>
> I just tried this on my amd64 7.0-BETA3 system with 2GB RAM and swap was 
> never touched but make still segfaulted during 'make -j1000 buildworld':
>
> [...]
> rm -f .depend
> mkdep -f .depend -a  [long list of files]
> echo libc.so.7: /usr/obj/usr/src/tmp/usr/lib/libgcc.a >> .depend
> Segmentation fault (core dumped)
> *** Error code 139
> 1 error
> *** Error code 2
> 1 error
> *** Error code 2
> 1 error
> *** Error code 2
> 1 error
>>
>> gdb -core /usr/obj/usr/src/lib/libc/make.core /usr/bin/make
> GNU gdb 6.1.1 [FreeBSD]
> [...]
> This GDB was configured as "amd64-marcel-freebsd"...
> Core was generated by `make'.
> Program terminated with signal 11, Segmentation fault.
> #0  0x0000000000432067 in __vfprintf ()
> (gdb) bt
> #0  0x0000000000432067 in __vfprintf ()
> #1  0x0000000000435114 in vfprintf ()
> #2  0x000000000042d676 in fprintf ()
> #3  0x0000000000406305 in JobExec (job=0x80123f000, argv=0x7fffffffdb10)
>    at /usr/src/usr.bin/make/job.c:1321
> #4  0x000000000040702d in JobStart (gn=0x8006d9120, flags=Variable "flags" is 
> not available.
> )
>    at /usr/src/usr.bin/make/job.c:1843
> #5  0x000000000040b14c in MakeStartJobs () at 
> /usr/src/usr.bin/make/make.c:621
> #6  0x000000000040b34c in Make_Run (targs=0x7fffffffe7f0)
>    at /usr/src/usr.bin/make/make.c:793
> #7  0x000000000040a081 in main (argc=0, argv=0x0)
>    at /usr/src/usr.bin/make/main.c:1273
>
> --
> Bruce
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