Re: [Moosefs-users] mfschunkserver eats 100% CPU

[Michał B. <mic...@ge...>]

Hi!

Is this a repeatable problem? Do you know a scenario which causes this behaviour?


Kind regards
Michał Borychowski 
MooseFS Support Manager
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Gemius S.A.
ul. Wołoska 7, 02-672 Warszawa
Budynek MARS, klatka D
Tel.: +4822 874-41-00
Fax : +4822 874-41-01


-----Original Message-----
From: Davies Liu [mailto:dav...@gm...] 
Sent: Thursday, November 03, 2011 2:47 AM
To: moo...@li...
Subject: [Moosefs-users] mfschunkserver eats 100% CPU

Hi，

Found one bug of mfschunkserver, it eats 100% CPU without any activities.

strace shows:

[pid  7754] gettimeofday({1320117856, 191716}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}]) [pid  7754] gettimeofday({1320117856, 192052}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}]) [pid  7754] gettimeofday({1320117856, 192404}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}]) [pid  7754] gettimeofday({1320117856, 192740}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}]) [pid  7754] gettimeofday({1320117856, 193063}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}]) [pid  7754] gettimeofday({1320117856, 193386}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}]) [pid  7754] gettimeofday({1320117856, 193710}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}]) [pid  7754] gettimeofday({1320117856, 194033}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}]) [pid  7754] gettimeofday({1320117856, 194893}, NULL) = 0 [pid  7754] read(222, 0x7f397c978d08, 408) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] read(29, 0x7f397cad2268, 29368) = -1 EAGAIN (Resource temporarily unavailable) [pid  7754] poll([{fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}, {fd=224, events=POLLIN|POLLOUT}, {fd=222, events=POLLIN}, {fd=125, events=POLLIN|POLLOUT}, {fd=29, events=POLLIN}], 8, 50) = 2 ([{fd=224, revents=POLLOUT}, {fd=125, revents=POLLOUT}])

It seems that fd 224 and 125 are ready , but it read fd 29 and 222, with -1, then fall into infinite loop.

--
 - Davies

------------------------------------------------------------------------------
RSA(R) Conference 2012
Save $700 by Nov 18
Register now
http://p.sf.net/sfu/rsa-sfdev2dev1
_______________________________________________
moosefs-users mailing list
moo...@li...
https://lists.sourceforge.net/lists/listinfo/moosefs-users