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Re: [Gluster-devel] Slowness and segfault with 313


From: Harris Landgarten
Subject: Re: [Gluster-devel] Slowness and segfault with 313
Date: Sat, 21 Jul 2007 20:24:25 -0400 (EDT)

There is a major slow down in patch 336 and beyond. Here are some numbers:

Patch 331

time tar -cvf /mnt/glusterfs/test/test.tbz 0 1 2 3

real    6m36.388s
user    0m0.150s
sys     0m1.400s

Patch 336

time tar -cvf /mnt/glusterfs/test/test.tbz 0 1 2 3

real    11m5.022s
user    0m0.180s
sys     0m1.420s

Patch 341

time tar -cvf /mnt/glusterfs/test/test.tbz 0 1 2 3

real    12m8.700s
user    0m0.170s
sys     0m1.550s


Patch 344

time tar -cvf /mnt/glusterfs/test/test.tbz 0 1 2 3

real    11m10.577s
user    0m0.130s
sys     0m1.700s

Something in patch 332-336 seems to be the problem.

Harris

----- Original Message -----
From: "Amar S. Tumballi" <address@hidden>
To: "Harris Landgarten" <address@hidden>
Cc: "Anand Avati" <address@hidden>, "gluster-devel" <address@hidden>
Sent: Friday, July 20, 2007 7:17:56 AM (GMT-0500) America/New_York
Subject: Re: [Gluster-devel] Slowness and segfault with 313

Hi Harris, 
Thanks for notifying us. Fix committed. (patch 331) 

-amar 


On 7/20/07 , Harris Landgarten < address@hidden > wrote: 

Strange crash. 

After restarting client, df -h crashes. If ls /mnt/glusterfs is run first, df 
-h runs fine. Verified on both clients. 

Here is the bt from Ubuntu 

Program terminated with signal 11, Segmentation fault. 
#0 data_to_ptr (data=0x8091e30) at dict.c:812 
812 { 
(gdb) bt 
#0 data_to_ptr (data=0x8091e30) at dict.c:812 
#1 0xb7faacc6 in default_statfs (frame=0x8091e30, this=0x80586c0, 
loc=0x8091cc4) at defaults.c:1001 
#2 0xb7faacc6 in default_statfs (frame=0x8091da0, this=0x8058760, 
loc=0x8091cc4) at defaults.c:1001 
#3 0x0804c19b in fuse_statfs (req=0x8091c68, ino=0) at fuse-bridge.c:1496 
#4 0xb7f9ab12 in fuse_reply_statfs_compat () from /usr/lib/libfuse.so.2 
#5 0xb7f9b1e3 in fuse_reply_entry () from /usr/lib/libfuse.so.2 
#6 0xb7f9c9c6 in fuse_session_process () from /usr/lib/libfuse.so.2 
#7 0x0804e019 in fuse_transport_notify (xl=0x8058c90, event=2, data=0x8052408) 
at fuse-bridge.c:2028 
#8 0xb7fad7c7 in transport_notify (this=0x8057a7c, event=0) at transport.c:152 
#9 0xb7fae239 in sys_epoll_iteration (ctx=0xbfecfec4) at epoll.c:54 
#10 0xb7fad89d in poll_iteration (ctx=0xbfecfec4) at transport.c:260 
#11 0x0804a36b in main (argc=6, argv=0xbfecffa4) at glusterfs.c:382 

Harris 

----- Original Message ----- 
From: "Anand Avati" < address@hidden > 
To: "Harris Landgarten" < address@hidden > 
Cc: "Amar S. Tumballi" < address@hidden >, "gluster-devel" < address@hidden > 
Sent: Thursday, July 19, 2007 4:17:39 PM (GMT-0500) America/New_York 
Subject: Re: [Gluster-devel] Slowness and segfault with 313 

Harris, 
both the slowness bug and the segfault you reported have been fixed in the 
latest TLA patchset. Please update and confirm that the fixes work for you. 

thanks, 
avati 


2007/7/17 , Harris Landgarten < address@hidden >: 

Amar, 

Anything on this bug. If you can tell me the tla command to get specific patch 
levels I will try to narrow to bug down further. 

Harris 

----- Original Message ----- 
From: "Amar S. Tumballi" < address@hidden > 
To: "Harris Landgarten" < address@hidden > 
Cc: "gluster-devel" < address@hidden > 
Sent: Monday, July 16, 2007 12:31:19 AM (GMT-0500) America/New_York 
Subject: Re: [Gluster-devel] Slowness and segfault with 313 

Hi Harris, 
Thanks for cornering the bugs between 309-313 . We are looking into it. 

-amar 


On 7/15/07 , Harris Landgarten < address@hidden > wrote: 

I just tested a full zimbra backup on my mailbox with 308 client and 313 bricks 
and it completed in normal time with no errors. This is more evidence that the 
problem is client only and was introduced in 309-313 . 

Harris 

----- Original Message ----- 
From: "Harris Landgarten" < address@hidden > 
To: "Harris Landgarten" < address@hidden > 
Cc: "gluster-devel" < address@hidden > 
Sent: Sunday, July 15, 2007 8:30:15 AM (GMT-0500) America/New_York 
Subject: Re: [Gluster-devel] Slowness and segfault with 313 

Some more testing: 

Patch 308 

time tar -cvf /mnt/glusterfs/test/test.tbz 0 1 2 3 

real 6m47.947s 
user 0m0.180s 
sys 0m1.220s 

Patch 313 

time tar -cvf /mnt/glusterfs/test/test.tbz 0 1 2 3 

real 9m21.909s 
user 0m0.160s 
sys 0m1.470s 


Patch 313 also used 50% more memory. 

This leads me to suspect the problem is in writebehind or posix-locks 

Harris 

----- Original Message ----- 
From: "Harris Landgarten" < address@hidden > 
To: "gluster-devel" < address@hidden > 
Sent: Saturday, July 14, 2007 2:23:20 PM (GMT-0500) America/New_York 
Subject: [Gluster-devel] Slowness and segfault with 313 

Last weekend with 299 a full Zimbra backup completed in 27 minutes. This 
weekend with 313 the backup was only about 1/2 through after 5 hrs. I aborted 
the backup and the client crashed. The abort would have tried to remove about 
4G of files from the /mnt/glusterfs/backups/tmp folder. The following BT was 
generated from the core: 

Core was generated by `[glusterfs] '. 
Program terminated with signal 11, Segmentation fault. 
#0 unify_unlink (frame=0xdec4b30, this=0x80585b0, loc=0xddb98dc) at 
unify.c:2256 
2256 list = loc->inode->private; 
(gdb) bt 
#0 unify_unlink (frame=0xdec4b30, this=0x80585b0, loc=0xddb98dc) at 
unify.c:2256 
#1 0xb7f32c66 in default_unlink (frame=0xdbc51f8, this=0x80592c0, 
loc=0xddb98dc) at defaults.c:480 
#2 0xb7f32c66 in default_unlink (frame=0xde06ca8, this=0x8059350, 
loc=0xddb98dc) at defaults.c:480 
#3 0x0804ccf3 in fuse_unlink (req=0xdf68980, par= 4786914 , name=0xcc16770 
"BbZslzxnS2Y,8Az0m2v5ExLBXbs= 6411-6246.msg1") at fuse-bridge.c:781 
#4 0xb7f21461 in fuse_reply_err () from /usr/lib/libfuse.so.2 
#5 0xb7f221e3 in fuse_reply_entry () from /usr/lib/libfuse.so.2 
#6 0xb7f239c6 in fuse_session_process () from /usr/lib/libfuse.so.2 
#7 0x0804abae in fuse_transport_notify (xl=0x8059910, event=2, data=0x8053410) 
at fuse-bridge.c:1942 
#8 0xb7f34cc7 in transport_notify (this=0xddb98dc, event= 204699600 ) at 
transport.c:152 
#9 0xb7f35979 in sys_epoll_iteration (ctx=0xbfb56b14) at epoll.c:54 
#10 0xb7f34d9d in poll_iteration (ctx=0xbfb56b14) at transport.c:260 
#11 0x0804a29b in main (argc=5, argv=0xbfb56bf4) at glusterfs.c:348 



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-- 
Amar Tumballi 
http://amar.80x25.org 
[bulde on #gluster/irc.gnu.org] 


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-- 
Anand V. Avati 




-- 
Amar Tumballi 
http://amar.80x25.org 
[bulde on #gluster/irc.gnu.org] 




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