* Thread debugging and scheduling behaviour
@ 2004-10-21 5:10 Hans Zuidam
2004-10-21 12:52 ` Daniel Jacobowitz
0 siblings, 1 reply; 2+ messages in thread
From: Hans Zuidam @ 2004-10-21 5:10 UTC (permalink / raw)
To: gdb
Hi,
When running a simple multi-threaded test outside and inside GDB we
see different scheduling behaviour. This is on a Linux 2.4.20 system.
Specifically the test uses SCHED_FIFO scheduling and fixed priorities.
What we see is that when run outside GDB the higher priority threads
run first until they yield, while running in GDB (just a `run' no
breakpoints) causes low priority threads to run before high priority
ones.
Is this "expected" Linux behaviour or does it have something to do
with the thread handling in GDB? Any pointers are greatly appreciated.
With kind regards,
Hans Zuidam
--
Hans Zuidam Advies tel. +31 40 2481546
De Koppele 136 mob. +31 6 42345456
5632 LD Eindhoven e-mail: h.zuidam@computer.org
The Netherlands
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Thread debugging and scheduling behaviour
2004-10-21 5:10 Thread debugging and scheduling behaviour Hans Zuidam
@ 2004-10-21 12:52 ` Daniel Jacobowitz
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Jacobowitz @ 2004-10-21 12:52 UTC (permalink / raw)
To: Hans Zuidam; +Cc: gdb
On Thu, Oct 21, 2004 at 01:10:56AM +0200, Hans Zuidam wrote:
> Hi,
>
> When running a simple multi-threaded test outside and inside GDB we
> see different scheduling behaviour. This is on a Linux 2.4.20 system.
>
> Specifically the test uses SCHED_FIFO scheduling and fixed priorities.
> What we see is that when run outside GDB the higher priority threads
> run first until they yield, while running in GDB (just a `run' no
> breakpoints) causes low priority threads to run before high priority
> ones.
>
> Is this "expected" Linux behaviour or does it have something to do
> with the thread handling in GDB? Any pointers are greatly appreciated.
GDB does not have any way to support thread priority.
--
Daniel Jacobowitz
^ permalink raw reply [flat|nested] 2+ messages in thread
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