On Wed, 2008-10-29 at 09:57 -0700, Garrett Cooper wrote: > On Wed, Oct 29, 2008 at 2:37 AM, Scott James Remnant <[EMAIL PROTECTED]> > wrote: > > On Tue, 2008-10-28 at 17:32 -0700, Garrett Cooper wrote: > > > >> After executing this example multiple times (~10 does the trick), I've > >> gotten init + libdbus to become unresponsive to a large degree, where > >> it starts printing out "latency error messages". I've seen this occur > >> on QEMU/ppc and I haven't been able to replicate the issue on MIPS > >> (yet). I have however seen the same error message when jamming a lot > >> of DBUS requests to upstart using our in-house client. > >> > > The author string isn't transmitted across libdbus, so I'm not sure > > that's relevant here? > > > > You're repeatedly allocating a 300KB author string? That'll be simply > > thrashing memory? > > > But it's allocating memory and waiting for a reply from the dbus shmem > bindings though -- that's where the issue can be seen. > The only communication with the bus daemon would be the signal announcing the change of object; this doesn't include author information.
> As I said, I haven't been able to get the issue to pop up on a real > target, but the performance issue pops up with single proc versions of > emulators -- where time + memory is more constrained than conventional > systems. So, I'm sure I could get the issue to pop up on a real target > by raising the value size to an artificially large value, but > shouldn't upstart be capping the amount of data it's passing through > with its parser via strn* or strl*? > No, I vaguely believe the only sensible limits are 0, 1 and unlimited. If you don't have the memory to waste on things like author names, don't put them in job files. Scott -- Have you ever, ever felt like this? Had strange things happen? Are you going round the twist?
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