Hi, Tapani:
Recently I come into a problem. I have a opengl program, if the program
run, it can take up almost one core, and the Xorg takes almost one core too.
I found this program continuously recvmsg from the Xorg. I'm sure the CPU
is takeing by too much sendmsg/recvmsg.
Following is the backtrace of this program when it call recvmsg:
#0 recvmsg () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007fb88abffdd7 in _xcb_in_read (c=c@entry=0x277e990) at
../../src/xcb_in.c:982
#2 0x00007fb88abfded1 in _xcb_conn_wait (c=c@entry=0x277e990,
cond=cond@entry=0x7fb8667fa5c0, vector=vector@entry=0x0,
count=count@entry=0x0) at ../../src/xcb_conn.c:495
#3 0x00007fb88abff617 in wait_for_reply (c=c@entry=0x277e990, request=2575173,
e=e@entry=0x7fb8667fa690)
at ../../src/xcb_in.c:516
#4 0x00007fb88abff721 in xcb_wait_for_reply (c=0x277e990, request=2575173,
e=0x7fb8667fa690) at ../../src/xcb_in.c:546
#5 0x00007fb88dd64ae7 in _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#6 0x00007fb88dd6052d in XSync () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#7 0x00007fb88748c1de in dri2XcbSwapBuffers (pdraw=0x7fb849a058c0,
remainder=<optimized out>, divisor=0, target_msc=0,
dpy=0x277d6d0) at dri2_glx.c:815
I strace the program's syscall,
the data is almost zeros.
recvmsg(20, {msg_name(0)=NULL,
msg_iov(1)=[{"g\0\325R\v\0@\4\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 2048
Could you tell me what's the possible cause of this problem.
---------------------------
Yanhua_______________________________________________
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