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тАО08-28-2002 01:08 AM
тАО08-28-2002 01:08 AM
tusc reports Interrupted system call with Sybase
We use Sybase 12 on HPUX 11i. For DBA, Sybase works well! But if I use tusc on the dataserver process, I see many lines like these :
[7791] select(0, NULL, NULL, NULL, 0xc0000000043672f0) ........................................................................... = 0
[7791] Received signal 14, SIGALRM, in select(), [caught], no siginfo
[7791] select(0, NULL, NULL, NULL, 0xc0000000043672f0) ........................................................................... ERR#4 EINTR
Error 4 is : Interrupted system call
Very strange, isn't it?
Someone can tell me what happens. Tkanks.
Eric
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тАО08-28-2002 07:58 AM
тАО08-28-2002 07:58 AM
Re: tusc reports Interrupted system call with Sybase
The EINTR is reported by select() because the requested SIGALRM is being delivered. It doesn't mean there's a problem.
Regards,
Steve
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тАО11-22-2003 11:47 AM
тАО11-22-2003 11:47 AM
Re: tusc reports Interrupted system call with Sybase
HPUX 11.00, RP7400 8CPU & 12GB mem.
They are running an archive process from another server which they say just does a simple select statement. For a while Sybase reports I/O from 50-150/sec, but then it drops down to 1-2/sec for a while. I have been examining the server and don't see any real change. CPUs are very low, I don't see any hammered disks, file systems, LVs, etc. Memory appears okay. sar %WIO remains 0.
During the 'slow' times I did notice with tusc that the trace starts showing a lot of: "Received signal 14, SIGALRM, in select(), [caught], no siginfo" lines. When it is running 'ok' then those lines do not show up much.
Any ideas?
Thanks,
David
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тАО11-22-2003 11:55 AM
тАО11-22-2003 11:55 AM
Re: tusc reports Interrupted system call with Sybase
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] Received signal 14, SIGALRM, in select(), [caught], no siginfo
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] Received signal 14, SIGALRM, in select(), [caught], no siginfo
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] Received signal 14, SIGALRM, in select(), [caught], no siginfo
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
Its not working too good right now so I can't get a good shot of that output. I will add it when I can.
David
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тАО11-22-2003 12:17 PM
тАО11-22-2003 12:17 PM
Re: tusc reports Interrupted system call with Sybase
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
[7022] lseek(78, 18014748672, SEEK_SET) .................. = 18014748672
[7022] read(78, "04n 8 h 04n 8 i 04n 8 w b 13aef0".., 16384) = 16384
[7022] lseek(78, 18014732288, SEEK_SET) .................. = 18014732288
[7022] read(78, "04n 8 ` 04n 8 a 04n 8 o b 13aef0".., 16384) = 16384
[7022] lseek(78, 18014715904, SEEK_SET) .................. = 18014715904
[7022] read(78, "04n 8 X 04n 8 Y 04n 8 g b 13aef0".., 16384) = 16384
[7022] lseek(78, 18014699520, SEEK_SET) .................. = 18014699520
[7022] read(78, "04n 8 P 04n 8 Q 04n 8 _ b 13aef0".., 16384) = 16384
[7022] lseek(78, 18014797824, SEEK_SET) .................. = 18014797824
[7022] read(78, "04n 8 8004n 8 8104n 8 W b 13aef0".., 16384) = 16384
[7022] lseek(78, 18014814208, SEEK_SET) .................. = 18014814208
[7022] read(78, "04n 8 8804n 8 8904n 8 87b 13aef0".., 16384) = 16384
[7022] select(0, NULL, NULL, NULL, 0xc0000000856a4190) ... = 0
David
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тАО11-25-2003 05:58 AM
тАО11-25-2003 05:58 AM
Re: tusc reports Interrupted system call with Sybase
The tool they are using to archive is called 'sqsh'.