04-21-2010
Installation of MPI in a cluster of SMPs
Hi,
I've installed mpich2 v. 1.2.1p1 on a cluster of dual-processors with the default options (in previous versions I used 'ssm' device, but now I use 'nemesis').
I'd like that every time I execute a job (e.g. with 2 MPI-processes), each job's process be dispatched on a different machine (until to complete the maximum number of machines) and not on a same machine, viz :
Job A with 2 process:
Machine 1:
CPU0 Empty
CPU1 Used
Machine 2:
CPU0 Empty
CPU1 Used
but now it is scheduled as
Machine 1:
CPU0 Used
CPU1 Used
Machine 2:
CPU0 Empty
CPU1 Empty
Regards!
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LEARN ABOUT DEBIAN
ptsematest
ptsematest(8) ptsematest(8)
NAME
ptsematest - Start two threads and measure the latency of interprocess communication with POSIX mutex.
SYNTAX
ptsematest [-a|-a PROC] [-b USEC] [-d DIST] [-i INTV] [-l loops] [-p PRIO] [-t|-t NUM]
DESCRIPTION
The program ptsematest starts two threads that are synchronized via pthread_mutex_unlock()/pthread_mutex_lock() and measures the latency
between releasing and getting the lock.
OPTIONS
-a, --affinity[=PROC]
Run on procesor number PROC. If PROC is not specified, run on current processor.
-b, --breaktrace=USEC
Send break trace command when latency > USEC. This is a debugging option to control the latency tracer in the realtime preemption
patch. It is useful to track down unexpected large latencies of a system.
-d, --distance=DIST
Set the distance of thread intervals in microseconds (default is 500 us). When cylictest is called with the -t option and more than
one thread is created, then this distance value is added to the interval of the threads: Interval(thread N) = Interval(thread N-1) +
DIST
-i, --interval=INTV
Set the base interval of the thread(s) in microseconds (default is 1000 us). This sets the interval of the first thread. See also
-d.
-l, --loops=LOOPS
Set the number of loops. The default is 0 (endless). This option is useful for automated tests with a given number of test cycles.
ptsematest is stopped once the number of timer intervals has been reached.
-p, --prio=PRIO
Set the priority of the process.
-t, --threads[=NUM]
Set the number of test threads (default is 1, if this option is not given). If NUM is specified, create NUM test threads. If NUM is
not specifed, NUM is set to the number of available CPUs.
EXAMPLES
The following example was running on a 4-way processor:
# ptsematest -a -t -p99 -i100 -d25 -l1000000
#0: ID8672, P99, CPU0, I100; #1: ID8673, P99, CPU0, Cycles 1000000
#2: ID8674, P98, CPU1, I125; #3: ID8675, P98, CPU1, Cycles 811035
#4: ID8676, P97, CPU2, I150; #5: ID8677, P97, CPU2, Cycles 668130
#6: ID8678, P96, CPU3, I175; #7: ID8679, P96, CPU3, Cycles 589423
#1 -> #0, Min 1, Cur 1, Avg 2, Max 11
#3 -> #2, Min 1, Cur 2, Avg 2, Max 13
#5 -> #4, Min 1, Cur 4, Avg 3, Max 12
#7 -> #6, Min 1, Cur 4, Avg 2, Max 12
AUTHORS
Carsten Emde <C.Emde@osadl.org>
SEE ALSO
pthread_mutex_lock(3p), pthread_mutex_unlock(3p)
0.1 ptsematest(8)