this is a linux bug in epoll
unfortunately there is a bug in libevent 1.4 which means we can't drop
back to poll or select on linux until libevent 2 becomes widespread
if you use libevent 2 instead of 1.4 you can export EVENT_NOEPOLL=1 and
that should fix this
On Fri, Feb 18, 2011 at 06:16:03PM -0500, mbm329 wrote:
> Seems like if I run a command that gives output, and I try to send
> that output to /dev/null, it hangs the command. This occurs with at
> least "set" and "setw" commands. I'm running tmux v1.4. I'm not sure
> if the following output will help, but thought I'd include it anyways.
>
> Example:
> $ tmux setw mode-keys vi >/dev/null
> $ tmux set mouse-select-pane on >/dev/null
>
> Upon running strace on the command, where it stops is an event poll on fd 3.
>
> $ strace -f setw mode-keys vi >/dev/null
> <snip>
> epoll_ctl(3, EPOLL_CTL_ADD, 6, {EPOLLIN|EPOLLOUT, {u32=6, u64=6}}) = 0
> epoll_wait(3, {{EPOLLOUT, {u32=6, u64=6}}}, 32, 4294967295) = 1
> clock_gettime(CLOCK_MONOTONIC, {6320894, 944207637}) = 0
> epoll_ctl(3, EPOLL_CTL_DEL, 6, {EPOLLIN|EPOLLOUT, {u32=6, u64=6}}) = 0
> sendmsg(6, {msg_name(0)=NULL,
> msg_iov(1)=[{"\0\0\0\0\34\10\0\0\6\0\0\0\377\377\377\377,a\0\0\0\0\0\0\3\0\0\0setw"...,
> 2076}], msg_controllen=0, msg_flags=0}, 0) = 2076
> epoll_ctl(3, EPOLL_CTL_ADD, 6, {EPOLLIN, {u32=6, u64=6}}) = 0
> epoll_wait(3,
>
>
> $ lsof -p 27629
> COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
> tmux 27629 mbm cwd DIR 253,6 4096 313345 /home/mbm
> tmux 27629 mbm rtd DIR 253,0 4096 2 /
> tmux 27629 mbm txt REG 253,3 472881 196646
> /usr/local/bin/tmux
> tmux 27629 mbm mem REG 253,0 139416 31750
> /lib64/ld-2.5.so
> tmux 27629 mbm mem REG 253,0 1718120 31757
> /lib64/libc-2.5.so
> tmux 27629 mbm mem REG 253,0 23360 31773
> /lib64/libdl-2.5.so
> tmux 27629 mbm mem REG 253,0 145824 31765
> /lib64/libpthread-2.5.so
> tmux 27629 mbm mem REG 253,0 18152 32080
> /lib64/libutil-2.5.so
> tmux 27629 mbm mem REG 253,0 114352 32067
> /lib64/libnsl-2.5.so
> tmux 27629 mbm mem REG 253,3 380464 1180532
> /usr/lib64/libncurses.so.5.5
> tmux 27629 mbm mem REG 253,0 92736 31783
> /lib64/libresolv-2.5.so
> tmux 27629 mbm mem REG 253,3 106696 1182989
> /usr/lib64/libevent-1.4.so.2.1.3
> tmux 27629 mbm mem REG 253,0 53448 31782
> /lib64/librt-2.5.so
> tmux 27629 mbm 0u CHR 136,1 3 /dev/pts/1
> tmux 27629 mbm 1w CHR 1,3 1910 /dev/null
> tmux 27629 mbm 2u CHR 136,1 3 /dev/pts/1
> tmux 27629 mbm 3r 0000 0,11 0 44807216 eventpoll
> tmux 27629 mbm 4u unix 0xffff810013970440 44807217 socket
> tmux 27629 mbm 5u unix 0xffff810013971780 44807218 socket
> tmux 27629 mbm 6u unix 0xffff8100139714c0 44807219 socket
>
> ------------------------------------------------------------------------------
> The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
> Pinpoint memory and threading errors before they happen.
> Find and fix more than 250 security defects in the development cycle.
> Locate bottlenecks in serial and parallel code that limit performance.
> http://p.sf.net/sfu/intel-dev2devfeb
> _______________________________________________
> tmux-users mailing list
> tmux-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/tmux-users
------------------------------------------------------------------------------
The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
Pinpoint memory and threading errors before they happen.
Find and fix more than 250 security defects in the development cycle.
Locate bottlenecks in serial and parallel code that limit performance.
http://p.sf.net/sfu/intel-dev2devfeb
_______________________________________________
tmux-users mailing list
tmux-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/tmux-users
