07-21-2005
How did you know about our work on the mersenne prime? ;p
Actually, the Oracle DB that our middleware utilizes is on an RX5670 (Itanium) box and that box is between 80-100% idle. So I think that Oracle is, expectedly, well behaved and the Itanium performs well. I've also been looking at the %CPU figure for processes and nothing seems to be grabbing a lot of CPU. What we do have is a lot of processes (over half [800+] are for the client PC connections). But they still only utilize a small portion of CPU (0.02% typically) so I'm not seeing anything that adds up to the high user CPU percentage figures I'm seeing. I've used 'ps -eo user,args,pcpu' there don't appear to be any major CPU hogs. The largest processes take up about 14-20% CPU but only briefly throughout the day.
Now that I look at things a little deeper though... Where I think the issue lies is in the architecture of the middleware and how it uses RAM. Looking at the RAM used by all process images for the middleware user account, it is constantly over the amount of physical RAM in the box. The vendor was particularly freaked out when they realized how large our client data set is which affects the size of lookup tables that they run for each process. It looks like we have (at this moment):
857 processes using 6M each ~10 Gigs
159 processes at 1.1M each ~180 Megs
43 processes at about 150M each ~6.5 Gigs
14 processes at about 111M each ~1.2 Gigs
Total = ~17 to 18 Gigs
Our box is maxed at 16 Gigs of physical RAM right now. So it would appear that we must be swapping a bit. When I tried a total of the vsz output of ps for the application user account, I saw 36 Gigs worth of process RAM usage. So... maybe the CPU user/sys/idle percentages are more a reflection of RAM usage? Does this sound like a possibility? I've already checked for i/o bottlenecks on our disk array and have cleared that as a possible problem point.
I believe we've populated the box's memory slots fully, so I don't think there is much we can do there until we get a bigger box.
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LEARN ABOUT DEBIAN
procrunnable
RUNQUEUE(9) BSD Kernel Developer's Manual RUNQUEUE(9)
NAME
chooseproc, procrunnable, remrunqueue, setrunqueue -- manage the queue of runnable processes
SYNOPSIS
#include <sys/param.h>
#include <sys/proc.h>
extern struct rq itqueues[];
extern struct rq rtqueues[];
extern struct rq queues[];
extern struct rq idqueues[];
struct thread *
choosethread(void);
int
procrunnable(void);
void
remrunqueue(struct thread *td);
void
setrunqueue(struct thread *td);
DESCRIPTION
The run queue consists of four priority queues: itqueues for interrupt threads, rtqueues for realtime priority processes, queues for time
sharing processes, and idqueues for idle priority processes. Each priority queue consists of an array of NQS queue header structures. Each
queue header identifies a list of runnable processes of equal priority. Each queue also has a single word that contains a bit mask identify-
ing non-empty queues to assist in selecting a process quickly. These are named itqueuebits, rtqueuebits, queuebits, and idqueuebits. The
run queues are protected by the sched_lock mutex.
procrunnable() returns zero if there are no runnable processes other than the idle process. If there is at least one runnable process other
than the idle process, it will return a non-zero value. Note that the sched_lock mutex does not need to be held when this function is
called. There is a small race window where one CPU may place a process on the run queue when there are currently no other runnable processes
while another CPU is calling this function. In that case the second CPU will simply travel through the idle loop one additional time before
noticing that there is a runnable process. This works because idle CPUs are not halted in SMP systems. If idle CPUs are halted in SMP sys-
tems, then this race condition might have more serious repercussions in the losing case, and procrunnable() may have to require that the
sched_lock mutex be acquired.
choosethread() returns the highest priority runnable thread. If there are no runnable threads, then the idle thread is returned. This func-
tion is called by cpu_switch() and cpu_throw() to determine which thread to switch to. choosethread() must be called with the sched_lock
mutex held.
setrunqueue() adds the thread td to the tail of the appropriate queue in the proper priority queue. The thread must be runnable, i.e. p_stat
must be set to SRUN. This function must be called with the sched_lock mutex held.
remrunqueue() removes thread td from its run queue. If td is not on a run queue, then the kernel will panic(9). This function must be
called with the sched_lock mutex held.
SEE ALSO
cpu_switch(9), scheduler(9), sleepqueue(9)
BSD
November 3, 2000 BSD