what's up with "make -j N" output?

what's up with "make -j N" output?

[Alexey Dobriyan]

Script does effectively:

	make -k -j5 &>1.log

What's inside:

  C  LD      drivers/input/built-in.o
  ^^^^^
  CC      fs/sysfs/symlink.o
  CC [M]  net/bluetooth/l2cap.o
  CC [M]  drivers/ide/ide-eh.o
  CC [M]  drivers/ide/ide-proc.o
  CC      net/core/skbuff.o
  CC      fs/sysfs/mount.o
  CC      fs/sysfs/bin.o
o					<===
  CC [M]  drivers/ide/ide-gd.o
  CC      fs/sysfs/group.o
  LD      fs/sysfs/built-in.o
  CC [M]  drivers/ide/ide-disk.o
  CC      fs/anon_inodes.o

  	...


  CC      drivers/mmc/core/sdio_cis.o
  CC      lib/div64.o
54/built-in.o				<===
  CC      net/ipv4/route.o


IIRC, I never saw this before.
Maybe something wasn't guaranteed before, but, hey, logs are crap now.

Kernel is 2.6.33-rc4-00204-g7dc9c48, x86_64

CONFIG_PREEMPT=y
CONFIG_HZ=100

# CONFIG_DEBUG_PERF_USE_VMALLOC is not set
# CONFIG_DEBUG_DRIVER is not set
# CONFIG_DEBUG_DEVRES is not set
# CONFIG_DEBUG_FS is not set
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_SHIRQ=y
CONFIG_DEBUG_OBJECTS=y
# CONFIG_DEBUG_OBJECTS_SELFTEST is not set
CONFIG_DEBUG_OBJECTS_FREE=y
CONFIG_DEBUG_OBJECTS_TIMERS=y
CONFIG_DEBUG_OBJECTS_WORK=y
CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT=1
# CONFIG_DEBUG_KMEMLEAK is not set
CONFIG_DEBUG_PREEMPT=y
CONFIG_DEBUG_RT_MUTEXES=y
CONFIG_DEBUG_PI_LIST=y
CONFIG_DEBUG_SPINLOCK=y
CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_LOCK_ALLOC=y
# CONFIG_DEBUG_LOCKDEP is not set
CONFIG_DEBUG_SPINLOCK_SLEEP=y
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
# CONFIG_DEBUG_KOBJECT is not set
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_VM=y
CONFIG_DEBUG_VIRTUAL=y
CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_MEMORY_INIT=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
CONFIG_DEBUG_NOTIFIERS=y
# CONFIG_DEBUG_CREDENTIALS is not set
# CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
CONFIG_DEBUG_PAGEALLOC=y
CONFIG_DEBUG_STACKOVERFLOW=y
CONFIG_DEBUG_STACK_USAGE=y
CONFIG_DEBUG_PER_CPU_MAPS=y
CONFIG_DEBUG_RODATA=y
CONFIG_DEBUG_RODATA_TEST=y
CONFIG_DEBUG_STRICT_USER_COPY_CHECKS=y

Re: what's up with "make -j N" output?

[Ralf Baechle]

On Mon, Jan 18, 2010 at 10:24:14PM +0200, Alexey Dobriyan wrote:

> Script does effectively:
> 
> 	make -k -j5 &>1.log

My automated builds effectively run a number of "make -j 1" builds in
parallel so I get sane parsable and readable logs.  I don't think we
give any guarantees for -j 2 or higher even though that would be highly
desirable when things go wrong.

  Ralf

Re: what's up with "make -j N" output?

[Alexey Dobriyan]

On Tue, Jan 19, 2010 at 6:56 PM, Ralf Baechle <ralf@linux-mips.org> wrote:
> On Mon, Jan 18, 2010 at 10:24:14PM +0200, Alexey Dobriyan wrote:
>
>> Script does effectively:
>>
>>       make -k -j5 &>1.log
>
> My automated builds effectively run a number of "make -j 1" builds in
> parallel so I get sane parsable and readable logs.

I do this too, still -j1 is waste of time if only one compile is running
for whatever reason.

> I don't think we give any guarantees for -j 2 or higher even though
> that would be highly desirable when things go wrong.

Meanwhile, bug dissapeared somewhere. :-\