Re: [Gluster-devel] Major slowdown in cp performance in 1.4 branch

[Brent A Nelson]

I went to try to test the read performance of that file and got:

dd if=/beast/blah0 of=/dev/null bs=1M
dd: opening `/beast/blah0': Input/output error
ls -al /beast
ls: cannot access /beast: No such file or directory
df
...
glusterfs            5697753088   4054016 5406548992   1% /beast
df /beast
df: `/beast': No such file or directory
df: no file systems processed

Looking through the processes, I see the namespace volumes both died.

Here's the tail end of one log:

2008-08-25 17:57:43 N [trace.c:1117:trace_lookup] ns0: callid: 420040 
(*this=0x8052ff8, loc=0xbf99a9a0 {path=/blah0, inode=0x80a2070} )
2008-08-25 17:57:43 N [trace.c:535:trace_lookup_cbk] ns0: callid: 420040 
(*this=0x8052ff8, op_ret=0, op_errno=61, inode=0x80a2070, *buf=0xbf99a864 
{st_dev=65031, st_ino=28855, st_mode=33188, st_nlink=1, st_uid=0, 
st_gid=0, st_rdev=0, st_size=0, st_blksize=4096, st_blocks=0})
2008-08-25 17:57:43 N [trace.c:1505:trace_open] ns0: (*this=0x8052ff8, 
loc=0x80adf20 {path=/blah0, inode=0x80a2070}, flags=32768, fd=0x80988e8)
2008-08-25 17:57:43 N [trace.c:150:trace_open_cbk] ns0: (*this=0x8052ff8, 
op_ret=0, op_errno=0, *fd=0x80988e8)
2008-08-25 17:57:43 W [common-utils.c:156:gf_print_bytes] glusterfs: Total 
data (in bytes): transfered (47460701), received (41736499)
pending frames:
frame : type(1) op(40)

Signal received: 11/lib/tls/i686/cmov/libc.so.6[0xb7d99128]
/usr/lib/libglusterfs.so.0(default_gf_lk+0xb4)[0xb7ee8724]
/usr/lib/glusterfs/1.4.0qa34/xlator/protocol/server.so(server_lk_common+0x6ff)[0xb7cf93df]
/usr/lib/glusterfs/1.4.0qa34/xlator/protocol/server.so(server_gf_lk+0x48)[0xb7cf95d8]
/usr/lib/glusterfs/1.4.0qa34/xlator/protocol/server.so(protocol_server_interpret+0xd6)[0xb7cf41e6]
/usr/lib/glusterfs/1.4.0qa34/xlator/protocol/server.so(protocol_server_pollin+0xb3)[0xb7cf43e3]
/usr/lib/glusterfs/1.4.0qa34/xlator/protocol/server.so(notify+0x51)[0xb7cf44e1]
/usr/lib/glusterfs/1.4.0qa34/transport/socket.so[0xb74e7f3a]
/usr/lib/libglusterfs.so.0[0xb7ef6a45]
/usr/lib/libglusterfs.so.0(event_dispatch+0x21)[0xb7ef5661]
glusterfsd(main+0x953)[0x804a163]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0)[0xb7d84450]
glusterfsd[0x80497a1]
---------


Thanks,

Brent

On Mon, 25 Aug 2008, Brent A Nelson wrote:

> 3.2 MBps, which is far less than previous, on a "dd if=/dev/zero 
> of=/beast/blah0 bs=1M count=10000"
>
> Thanks,
>
> Brent
>
> On Mon, 25 Aug 2008, Amar S. Tumballi wrote:
>
> > Brent,
> > Can you check the dd speed too? One user on irc reported very slow cp
> > performance too, but his dd performance was good.
> >
> > Regards,
> >
> > 2008/8/25 Brent A Nelson <address@hidden>
> >
> > > A checkout today from the 1.4 branch seems to give terrible performance on
> > > "cp -a".  Something that took a little over 9 minutes from a checkout last
> > > week now takes over an hour (it hasn't finished yet).  CPU time consumed 
> > > by
> > > glusterfs and all the glusterfsd processes is quite a bit smaller than it
> > > used to be; it looks like a recent patch is causing a substantial
> > > performance issue...
> > >
> > > Thanks,
> > >
> > > Brent
> > >
> > >
> > > _______________________________________________
> > > Gluster-devel mailing list
> > > address@hidden
> > > http://lists.nongnu.org/mailman/listinfo/gluster-devel
> >
> >
> >
> > --
> > Amar Tumballi
> > Gluster/GlusterFS Hacker
> > [bulde on #gluster/irc.gnu.org]
> > http://www.zresearch.com - Commoditizing Super Storage!