06-06-2008
Newbie question
Dear all,
I have a question related to parallel programing and if you can give me some hints on how to deal with it, it would be really great.
I would like to run a small application on a supercompter of 128 CPUs. Unfortunately, on this machine only jobs which require 32 CPUs are allowed to run. My applications are, however, scalling only up to 16 CPUs. If I require 32 CPUs, the job will not run as I do not have enough data to fill the CPUs.
I think that maybe it is possible to submit, instead of a job on 32 CPUs, 2 jobs - each on 16 CPUs. This would mean that a master script (in MPI, probably) should ask at the begining for 32 CPUs, and then divide this partition into two smaller ones (of 16 CPUs), on each of them starting a different application (from a different directory).
As I have no experience with parallel programing I do not know to do this. Is it possible to give some hints on how to do it. (I do not expect someone to do the work in my place, but I need some hints to get start with, as possible keyword to use, etc).
Many thanks for any answer.
With all the best wishes,
Eduard
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LEARN ABOUT CENTOS
perf-trace
PERF-TRACE(1) perf Manual PERF-TRACE(1)
NAME
perf-trace - strace inspired tool
SYNOPSIS
perf trace
DESCRIPTION
This command will show the events associated with the target, initially syscalls, but other system events like pagefaults, task lifetime
events, scheduling events, etc.
Initially this is a live mode only tool, but eventually will work with perf.data files like the other tools, allowing a detached record
from analysis phases.
OPTIONS
-a, --all-cpus
System-wide collection from all CPUs.
-e, --expr
List of events to show, currently only syscall names. Prefixing with ! shows all syscalls but the ones specified. You may need to
escape it.
-o, --output=
Output file name.
-p, --pid=
Record events on existing process ID (comma separated list).
-t, --tid=
Record events on existing thread ID (comma separated list).
-u, --uid=
Record events in threads owned by uid. Name or number.
-v, --verbose=
Verbosity level.
-i, --no-inherit
Child tasks do not inherit counters.
-m, --mmap-pages=
Number of mmap data pages. Must be a power of two.
-C, --cpu
Collect samples only on the list of CPUs provided. Multiple CPUs can be provided as a comma-separated list with no space: 0,1. Ranges
of CPUs are specified with -: 0-2. In per-thread mode with inheritance mode on (default), Events are captured only when the thread
executes on the designated CPUs. Default is to monitor all CPUs.
--duration: Show only events that had a duration greater than N.M ms.
--sched: Accrue thread runtime and provide a summary at the end of the session.
-i --input Process events from a given perf data file.
SEE ALSO
perf-record(1), perf-script(1)
perf 06/30/2014 PERF-TRACE(1)