On Wed, 11 Apr 2012, Dan McDonald wrote:
One other thing you may wish to try is use libumem's version of malloc()
instead. You can run libumem w/o any recompilation by doing stupid
environment tricks:
LD_PRELOAD=libumem.so
will be enough to make libumem's version of malloc be used instead of libc's.
Not sure if it'll help you, but it's a worthy experiment.
This was a good suggestion and in fact I already switched to using
libumem since my previous email. My application has a specific
configuration option to use libumem.
I am still seeing considerable time attributed to the memory allocator
and in fact it is reported as the high-runner for mutex blocks even
though there are very few calls to it. For this case, my
application's own locks (starting with gm`) are in the noise:
Mutex block
Count nsec Lock Caller
-------------------------------------------------------------------------------
44 24826292 libc.so.1`__sbrk_lock libumem.so.1`vmem_sbrk_alloc+0x84
62 1071393 0x7a5030 libumem.so.1`vmem_xalloc+0xe8
46 1397292 0x7a5030 libumem.so.1`vmem_xalloc+0x675
71 898233 0x7a5030 libumem.so.1`vmem_alloc+0x7e
13 699682 libumem.so.1`vmem0+0x30 libumem.so.1`vmem_alloc+0x7e
5 953203 libumem.so.1`vmem0+0x30 libumem.so.1`vmem_xalloc+0x6a5
10 429394 libc.so.1`_uberdata+0x2900 libc.so.1`_lwp_start
5 644450 libumem.so.1`vmem0+0x30 libumem.so.1`vmem_contains+0x30
4 531624 libumem.so.1`vmem0+0x30 libumem.so.1`vmem_xalloc+0xe8
15 109154 0x875340 gm`ConvolveImage._omp_fn.8+0x11e
17 93406 0x855040 gm`LockSemaphoreInfo+0x3d
10 154880 libumem.so.1`vmem0+0xc38 libumem.so.1`vmem_alloc+0x7e
4 354445 libumem.so.1`vmem0+0xc38 libumem.so.1`vmem_xalloc+0x675
18 71054 0x875340 gm`ConvolveImage._omp_fn.8+0x97
3 395671 libumem.so.1`vmem_nosleep_lock libumem.so.1`vmem_populate+0xb2
4 187098 libumem.so.1`vmem0+0xc38 libumem.so.1`vmem_xalloc+0xe8
8 92230 libc.so.1`_uberdata+0x2900
libgomp.so.1.0.0`gomp_thread_start+0x24
14 52305 0x855010 gm`LockSemaphoreInfo+0x3d
13 30087 0x855cd0 gm`LockSemaphoreInfo+0x3d
1 388634 libumem.so.1`vmem_nosleep_lock libumem.so.1`vmem_populate+0xb2
5 65664 0x855d00 gm`LockSemaphoreInfo+0x3d
2 154188 libumem.so.1`vmem_segfree_lock
libumem.so.1`vmem_getseg_global+0x16
1 157818 libumem.so.1`vmem_nosleep_lock libumem.so.1`vmem_populate+0xb2
1 54092 libc.so.1`_uberdata+0x40 LM1`ld.so.1`rt_bind_guard+0x42
2 16986 libumem.so.1`vmem_segfree_lock
libumem.so.1`vmem_getseg_global+0x16
1 11806 0x1f5980a0
libgomp.so.1.0.0`gomp_team_barrier_wait+0x11
1 10651 0x875340 gm`ConvolveImage._omp_fn.8+0x11e
Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
-------------------------------------------
illumos-discuss
Archives: https://www.listbox.com/member/archive/182180/=now
RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be
Modify Your Subscription:
https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4
Powered by Listbox: http://www.listbox.com
