Hi,
Have you tried running the whole thing through lstrace? That might help
determining which function in glibc causes the call to gettimeofday().
If you have access to a test system, you might also want to downgrade
glibc to whatever version we used in U1, just to make sure the problem
comes from glibc (which is what I suspect).
Let us know if you find the solution.
Cheers,
-Dominic
On Tue, 2006-02-07 at 17:12 +0000, Ollie Cook wrote:
> Hi,
>
> Since upgrading from Redhat ES 4 Update 1 to Redhat ES 4 Update 2 we
> have been seeing our java processes making a great deal of gettimeofday
> system calls which they didn't previously make.
>
> The following list demonstrate the change in behaviour. It shows the
> number of system calls (from strace) over a short (5-10 second) period
> of one Java thread.
>
> We are running 1.4.2-02 (but we have reproduced the behaviour on -03 as
> well) using the 64-bit AMD binary.
>
> 2 close
> 6 open
> 8 fstat
> 10 stat
> 71 read
> 105 ioctl
> 122 lseek
> 215 sched_yield
> 344 poll
> 926 write
> 1287 sendto
> 1354 rt_sigprocmask
> 1354 rt_sigsuspend
> 1356 rt_sigreturn
> 2230 recvfrom
> 14690 kill
> 812536 gettimeofday
>
> As you can see gettimeofday is by far and away the most frequently
> called system call under Update 2. The following is a similar sample
> from Update 1 (although for a shorter time period):
>
> 1 sched_yield
> 2 open
> 2 stat
> 19 poll
> 37 write
> 66 rt_sigprocmask
> 66 rt_sigsuspend
> 86 sendto
> 88 rt_sigreturn
> 143 recvfrom
> 792 kill
>
> I'm following this up with Redhat in case it's related to a modification
> to glibc or libpthread, and have no reason to believe this issue is
> necessarily related to the Blackdown JVM itself.
>
> However, I would be keen to hear if any other users of the Blackdown JVM
> have noticed similar behaviour to this on Redhat ES 4 Update 2.
>
> Yours,
>
> Ollie
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Dominic Duval, RHCE/RHCX Cell: 514-581-7975
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